$161 oscilloscope...

On Sun, 19 Dec 2021 16:52:25 GMT, Jan Panteltje
<pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sun, 19 Dec 2021 08:24:57 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
u2nurg57orl5mk9ok6d7g6c4g2v7p0c0rn@4ax.com>:

On Sun, 19 Dec 2021 06:27:13 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsbg35bhqno86fu88fef@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss

Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope! I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above. (My current record is 14
GHz iirc.) It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow. (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
https://www.radiomuseum.org/tubes/tube_oc13.html

Mine was prettier, a really nice translucent purple-blue paint on an
aluminum can. Inside was a smaller hearing-aid transistor in a can, a
reject from the main batches.

Yes, but if you removed the paint from mine, then you could use it as photo transistor.
It actually gave of some voltage when in the sun.
Click to expand...

I used to use selenium solar cells as photoreceivers. A flashlight
bulb and a selenium-cell receiver made a surprisingly good audio link.

I wonder what the selenium efficiency was. 1% ?

I also used a Ge transistor in a flashlight reflector as a thermal IR
detector. It could detect my hand from a foot or two away.



--

I yam what I yam - Popeye
 
On a sunny day (Sun, 19 Dec 2021 09:40:29 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
<9crurg9b3tl4sq9pns0tlu1dv6k0fi02qm@4ax.com>:

On Sun, 19 Dec 2021 16:52:25 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sun, 19 Dec 2021 08:24:57 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
u2nurg57orl5mk9ok6d7g6c4g2v7p0c0rn@4ax.com>:

On Sun, 19 Dec 2021 06:27:13 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsbg35bhqno86fu88fef@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss

Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope! I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above. (My current record is 14
GHz iirc.) It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow. (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
https://www.radiomuseum.org/tubes/tube_oc13.html

Mine was prettier, a really nice translucent purple-blue paint on an
aluminum can. Inside was a smaller hearing-aid transistor in a can, a
reject from the main batches.

Yes, but if you removed the paint from mine, then you could use it as photo transistor.
It actually gave of some voltage when in the sun.

I used to use selenium solar cells as photoreceivers. A flashlight
bulb and a selenium-cell receiver made a surprisingly good audio link.

I wonder what the selenium efficiency was. 1% ?
Click to expand...

Googing (it that knows [almost] everything) for \'selenium solar cell efficiency\' gives scholar articles, 5.7%.


I also used a Ge transistor in a flashlight reflector as a thermal IR
detector. It could detect my hand from a foot or two away.
Click to expand...

Nice, did you just measure output of the transistor or use it in some powered circuit with gain?
I still have some OC71 (I think it is) here that I took from old army equipment.
 
On Sun, 19 Dec 2021 20:02:42 GMT, Jan Panteltje
<pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sun, 19 Dec 2021 09:40:29 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
9crurg9b3tl4sq9pns0tlu1dv6k0fi02qm@4ax.com>:

On Sun, 19 Dec 2021 16:52:25 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sun, 19 Dec 2021 08:24:57 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
u2nurg57orl5mk9ok6d7g6c4g2v7p0c0rn@4ax.com>:

On Sun, 19 Dec 2021 06:27:13 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsbg35bhqno86fu88fef@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss

Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope! I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above. (My current record is 14
GHz iirc.) It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow. (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
https://www.radiomuseum.org/tubes/tube_oc13.html

Mine was prettier, a really nice translucent purple-blue paint on an
aluminum can. Inside was a smaller hearing-aid transistor in a can, a
reject from the main batches.

Yes, but if you removed the paint from mine, then you could use it as photo transistor.
It actually gave of some voltage when in the sun.

I used to use selenium solar cells as photoreceivers. A flashlight
bulb and a selenium-cell receiver made a surprisingly good audio link.

I wonder what the selenium efficiency was. 1% ?

Googing (it that knows [almost] everything) for \'selenium solar cell efficiency\' gives scholar articles, 5.7%.


I also used a Ge transistor in a flashlight reflector as a thermal IR
detector. It could detect my hand from a foot or two away.

Nice, did you just measure output of the transistor or use it in some powered circuit with gain?
I still have some OC71 (I think it is) here that I took from old army equipment.
Click to expand...

It has been a while. I think I put it in series with a battery and a
pot and a mA meter and ran it partly into thermal runaway, which
greatly increased the sensitivity.

I did a lot of crazy stuff as a kid. Flashtube/PMT lidar. Poisonous HV
Kerr cells. Thyratrons dumping caps into auto ignition coils.
Filament-controlled HV rectifiers on neon sign transformers charging
big oil caps. Giant electrolytic cap bank magnetizers. Radioactive
stuff. All kinds of fun dangerous things.



--

I yam what I yam - Popeye
 
Jan Panteltje wrote:
On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsbg35bhqno86fu88fef@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss

Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope! I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above. (My current record is 14
GHz iirc.) It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow. (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
https://www.radiomuseum.org/tubes/tube_oc13.html
Click to expand...

I think the first one I bought was a TR01-C, a TO3-packaged germanium
made by IR. (I think it was germanium, anyway, but I was 11 years old,
so I don\'t suppose I had any idea of the distinction.) I haven\'t been
able to pull up a datasheet on it.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On Sun, 19 Dec 2021 16:18:54 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

Jan Panteltje wrote:
On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsbg35bhqno86fu88fef@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss

Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope! I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above. (My current record is 14
GHz iirc.) It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow. (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
https://www.radiomuseum.org/tubes/tube_oc13.html


I think the first one I bought was a TR01-C, a TO3-packaged germanium
made by IR. (I think it was germanium, anyway, but I was 11 years old,
so I don\'t suppose I had any idea of the distinction.) I haven\'t been
able to pull up a datasheet on it.

Cheers

Phil Hobbs
Click to expand...

NTE calls this an equivalent - probably close enough:
https://weisd.com/uploads/product/sheet_pdf/3758/NTE121.pdf

ft of 300kHz .. it\'s hard to be worse than a 2N3055 but that does it.


--
Best regards,
Spehro Pefhany
 
On a sunny day (Sun, 19 Dec 2021 12:50:37 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
<t46vrghsjiqpgakhn3c322vgirf37d1sc3@4ax.com>:

On Sun, 19 Dec 2021 20:02:42 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sun, 19 Dec 2021 09:40:29 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
9crurg9b3tl4sq9pns0tlu1dv6k0fi02qm@4ax.com>:

On Sun, 19 Dec 2021 16:52:25 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sun, 19 Dec 2021 08:24:57 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
u2nurg57orl5mk9ok6d7g6c4g2v7p0c0rn@4ax.com>:

On Sun, 19 Dec 2021 06:27:13 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsbg35bhqno86fu88fef@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss

Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope! I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above. (My current record is 14
GHz iirc.) It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow. (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
https://www.radiomuseum.org/tubes/tube_oc13.html

Mine was prettier, a really nice translucent purple-blue paint on an
aluminum can. Inside was a smaller hearing-aid transistor in a can, a
reject from the main batches.

Yes, but if you removed the paint from mine, then you could use it as photo transistor.
It actually gave of some voltage when in the sun.

I used to use selenium solar cells as photoreceivers. A flashlight
bulb and a selenium-cell receiver made a surprisingly good audio link.

I wonder what the selenium efficiency was. 1% ?

Googing (it that knows [almost] everything) for \'selenium solar cell efficiency\' gives scholar articles, 5.7%.


I also used a Ge transistor in a flashlight reflector as a thermal IR
detector. It could detect my hand from a foot or two away.

Nice, did you just measure output of the transistor or use it in some powered circuit with gain?
I still have some OC71 (I think it is) here that I took from old army equipment.

It has been a while. I think I put it in series with a battery and a
pot and a mA meter and ran it partly into thermal runaway, which
greatly increased the sensitivity.
Click to expand...

I may scrape the paint of an OC71 and see if it sees me in IR..


I did a lot of crazy stuff as a kid. Flashtube/PMT lidar. Poisonous HV
Kerr cells. Thyratrons dumping caps into auto ignition coils.
Filament-controlled HV rectifiers on neon sign transformers charging
big oil caps. Giant electrolytic cap bank magnetizers. Radioactive
stuff. All kinds of fun dangerous things.
Click to expand...

Yea, I remeber having a big round TV CRT with HV generated by an audio amp feeding into a car ignition coil, on my bed.
That was also the horizontal scan IIRC.
And then an other audio amp on the vertical deflection coils.
My oscilloscope! No sync...
Dangerous, implosion danger.
In my last year at highschool I tried donating it to our physics teacher, but he did not want it (should have made a nice display in the auditorium)
maybe he was afraid of it?, so the tube went back to the local TV repair shop where I got it from.
BIG scope!
Before that all sort of RF transmitters, even one with transistors, had our own radio FM station in the basement. :)
Before that 1.5 V tubes.
Before that crystal radios.. Now we are in the early fifties.
Chemicals? I build some thing that increased pressure in some can, and put it under the teahers desk, the lid went boom after a while.
The danger was not much in the boom but in me being kicked out of school...
Not that I gave a dime in those years, parents then send me to a boarding school...
You shall study.
Rebellion?

Sinatra \'I did it my way\'
 
On 19/12/21 21:18, Phil Hobbs wrote:
Jan Panteltje wrote:
On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsbg35bhqno86fu88fef@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss


Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope!  I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above.  (My current record is 14
GHz iirc.)  It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow.  (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
  https://www.radiomuseum.org/tubes/tube_oc13.html


I think the first one I bought was a TR01-C, a TO3-packaged germanium made by
IR.  (I think it was germanium, anyway, but I was 11 years old, so I don\'t
suppose I had any idea of the distinction.)  I haven\'t been able to pull up a
datasheet on it.
Click to expand...

Mine came in the Philips EE-20 kit produced \"63-65?\" which would
make me around 9. I still have a few of the parts, sad to say.
(Yes, the rest of my house is as that implies, compounded by
being in the middle of clearing my parents\' house)

The manual was remarkably good:
- top half explained circuit theory
- bottom half explained construction techniques

Hans Otten seems to have a pleasing fetish for the Philips EE kits :)
http://www.hansotten.com/electronic-kits/ee-series/ee8-ee20-a20/
 
On Mon, 20 Dec 2021 07:56:24 GMT, Jan Panteltje
<pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sun, 19 Dec 2021 12:50:37 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
t46vrghsjiqpgakhn3c322vgirf37d1sc3@4ax.com>:

On Sun, 19 Dec 2021 20:02:42 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sun, 19 Dec 2021 09:40:29 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
9crurg9b3tl4sq9pns0tlu1dv6k0fi02qm@4ax.com>:

On Sun, 19 Dec 2021 16:52:25 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sun, 19 Dec 2021 08:24:57 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
u2nurg57orl5mk9ok6d7g6c4g2v7p0c0rn@4ax.com>:

On Sun, 19 Dec 2021 06:27:13 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsbg35bhqno86fu88fef@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss

Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope! I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above. (My current record is 14
GHz iirc.) It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow. (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
https://www.radiomuseum.org/tubes/tube_oc13.html

Mine was prettier, a really nice translucent purple-blue paint on an
aluminum can. Inside was a smaller hearing-aid transistor in a can, a
reject from the main batches.

Yes, but if you removed the paint from mine, then you could use it as photo transistor.
It actually gave of some voltage when in the sun.

I used to use selenium solar cells as photoreceivers. A flashlight
bulb and a selenium-cell receiver made a surprisingly good audio link.

I wonder what the selenium efficiency was. 1% ?

Googing (it that knows [almost] everything) for \'selenium solar cell efficiency\' gives scholar articles, 5.7%.


I also used a Ge transistor in a flashlight reflector as a thermal IR
detector. It could detect my hand from a foot or two away.

Nice, did you just measure output of the transistor or use it in some powered circuit with gain?
I still have some OC71 (I think it is) here that I took from old army equipment.

It has been a while. I think I put it in series with a battery and a
pot and a mA meter and ran it partly into thermal runaway, which
greatly increased the sensitivity.

I may scrape the paint of an OC71 and see if it sees me in IR..


I did a lot of crazy stuff as a kid. Flashtube/PMT lidar. Poisonous HV
Kerr cells. Thyratrons dumping caps into auto ignition coils.
Filament-controlled HV rectifiers on neon sign transformers charging
big oil caps. Giant electrolytic cap bank magnetizers. Radioactive
stuff. All kinds of fun dangerous things.

Yea, I remeber having a big round TV CRT with HV generated by an audio amp feeding into a car ignition coil, on my bed.
That was also the horizontal scan IIRC.
And then an other audio amp on the vertical deflection coils.
My oscilloscope! No sync...
Dangerous, implosion danger.
In my last year at highschool I tried donating it to our physics teacher, but he did not want it (should have made a nice display in the auditorium)
maybe he was afraid of it?, so the tube went back to the local TV repair shop where I got it from.
BIG scope!
Before that all sort of RF transmitters, even one with transistors, had our own radio FM station in the basement. :)
Before that 1.5 V tubes.
Before that crystal radios.. Now we are in the early fifties.
Chemicals? I build some thing that increased pressure in some can, and put it under the teahers desk, the lid went boom after a while.
The danger was not much in the boom but in me being kicked out of school...
Not that I gave a dime in those years, parents then send me to a boarding school...
You shall study.
Rebellion?

Sinatra \'I did it my way\'
Click to expand...

Kids are so much more protected now, and so much more afraid.



--

I yam what I yam - Popeye
 
On Monday, December 20, 2021 at 11:28:36 AM UTC-4, jla...@highlandsniptechnology.com wrote:
On Mon, 20 Dec 2021 07:56:24 GMT, Jan Panteltje
Chemicals? I build some thing that increased pressure in some can, and put it under the teahers desk, the lid went boom after a while.
The danger was not much in the boom but in me being kicked out of school...
Not that I gave a dime in those years, parents then send me to a boarding school...
You shall study.
Rebellion?

Sinatra \'I did it my way\'
Kids are so much more protected now, and so much more afraid.
Click to expand...

It shows that the average age in this group is over 60.

The irony is that the old line is getting old enough that they are fading away and the average age is probably getting younger now. After all, none of us keep getting older indefinitely.

--

Rick C.

-- Get 1,000 miles of free Supercharging
-- Tesla referral code - https://ts.la/richard11209
 
Spehro Pefhany wrote:
On Sun, 19 Dec 2021 16:18:54 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Jan Panteltje wrote:
On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jlarkin@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsbg35bhqno86fu88fef@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss

Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope! I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above. (My current record is 14
GHz iirc.) It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow. (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
https://www.radiomuseum.org/tubes/tube_oc13.html


I think the first one I bought was a TR01-C, a TO3-packaged germanium
made by IR. (I think it was germanium, anyway, but I was 11 years old,
so I don\'t suppose I had any idea of the distinction.) I haven\'t been
able to pull up a datasheet on it.

Cheers

Phil Hobbs

NTE calls this an equivalent - probably close enough:
https://weisd.com/uploads/product/sheet_pdf/3758/NTE121.pdf

ft of 300kHz .. it\'s hard to be worse than a 2N3055 but that does it.
Click to expand...
Looks about right, thanks. It was a megaphone project from a book--used
a carbon mic button, a speaker, and +-3V from four AA cells.

Worked fine but really chewed batteries.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
Chemicals? I build some thing that increased pressure in some can, and put it under the teahers desk, the lid went boom after a while.
The danger was not much in the boom but in me being kicked out of school...
Click to expand...

You just reminded me of one of mine. I thought it would be so cool and
impress my 7th grade science teacher, Mr Ragle, by bringing in a
big bottle of hydrogen. I just read about electrolysis of water (I used an
electric train DC power supply -- that had a \'smelly\' Selenium plate dual-diode;
and carbon rods from \"D\" cells). He was cool as a cuke, \"that\'s nice\", & gave it
not much concern. You see, the bottle was plastic (shampoo), sealed with a
work & some wax. So unbeknownst to me, the danger leaked out way before
I even got to school. He was kind & didnt \"leak\" this information to me, though.
 
> work & some wax. So unbeknownst to me, the danger leaked out way before
* CORK
 
> Kids are so much more protected now, and so much more afraid.

well to be fair, some parents (mine) had no clue
we were doing these risky things in the basement...
(not that it would\'ve made much difference, in
my case). Although, once I blew out a fuse, & darkened
some rooms (shorting out the AC line - I though carbon
had more resistance than that...), that get their
attention.
 
On Monday, 20 December 2021 at 05:35:31 UTC, Spehro Pefhany wrote:
On Sun, 19 Dec 2021 16:18:54 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

Jan Panteltje wrote:
On a sunny day (Sat, 18 Dec 2021 14:27:17 -0800) it happened
jla...@highlandsniptechnology.com wrote in
srnsrglr1qa6arpsb...@4ax.com>:

On Sat, 18 Dec 2021 16:28:08 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

jla...@highlandsniptechnology.com wrote:
On Sat, 18 Dec 2021 08:27:49 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

Rich S wrote:
On Friday, December 17, 2021 at 10:54:41 PM UTC, John Larkin wrote:
On Fri, 17 Dec 2021 16:32:48 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
I was looking for something else and this showed up:

https://www.amazon.com/s?k=0751300436685&crid=21WX22FGW2XXG&sprefix=0751300436685%2Caps%2C262&ref=nb_sb_noss

Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.




Potentially pretty useful, especially in a tool bag.

Cheers

Phil Hobbs
I could keep one at home. Or in my car.
--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

\"Debugging Weapon\"
finally, Amazon is selling weapons.
Kill those lousy oscillations.


Not with a 100 MHz scope! I did see one at 38 MHz a couple of months
ago, but it\'s more usually 300 MHz or above. (My current record is 14
GHz iirc.) It\'s pretty cool to be able to get magic 60 GHz transistors
for 20 cents.

I remember designing 70-MHz crystal oscillators with 2N5179s back in the
day, because 2N3904s were slightly too slow. (Yikes, that was 40 years
ago!)

Cheers

Phil Hobbs

In my mis-spent youth I designed an RC emitter follower + 7414 schmitt
gate as a system power-on reset. The 2N2219 oscillated so hard at 100
MHz it never got the gate input high.

Transistors are so much better now!

Of course a CK722 would probably have worked too. ;)

No, I needed an NPN.

But CK722 was my first transistor. It cost $7, a couple of months\'
allowance.

https://www.dropbox.com/s/wuv7xjd5jg1i3lx/Ck722-0A.JPG?raw=1

My first transistor was the OC13 (Philips) Ge PNP 10mA LF
https://www.radiomuseum.org/tubes/tube_oc13.html


I think the first one I bought was a TR01-C, a TO3-packaged germanium
made by IR. (I think it was germanium, anyway, but I was 11 years old,
so I don\'t suppose I had any idea of the distinction.) I haven\'t been
able to pull up a datasheet on it.

Cheers

Phil Hobbs
NTE calls this an equivalent - probably close enough:
https://weisd.com/uploads/product/sheet_pdf/3758/NTE121.pdf

ft of 300kHz .. it\'s hard to be worse than a 2N3055 but that does it.
Click to expand...

The early power geraniums were much worse. I guess it\'s hard to move back & forth under the weight of all those stems.
 
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