$161 oscilloscope...

[legg]

On Sat, 18 Dec 2021 11:51:12 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

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

** How about a VHF/ UHF SA for A$220 ?

https://www.ebay.com.au/itm/174645368295?hash=item28a9acd5e7:g:vKgAAOSw7WJgUjkv

Thousands of uses......
..... Phil
Microwave frequency synthesizers can be had for literally 1/1000 of
what they cost 20 or 30 years ago.
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

what is everyone\'s opinion about \"USB scopes\" and \"USB SA\", etc.
where the computer does all human interface & control, and
a little black box handles the in\'s & out\'s.
I think I like it since the laptop has UXGA resolution or better, way
beyond what these stand-alone pieces have.


I\'d way rather have a stack of boat anchors for the same money. My lab
has nearly $2M worth of top-of-the-line test gear (at list prices) that
I\'ve paid probably $50k for over the years.

SDR-style spectrum analyzers are okay for spur chasing, but mostly
useless for the kind of RF stuff I do, which requires low phase noise.

USB things are great for portable use, of course, but AFAICT they tend
to be limited by their software.

The Ocean Optics spectrometers are the same way--the software is
infinitely flexible if you want to spend a week setting it up, but it\'s
a huge pain if you just want to turn it on and measure a spectrum.

Machines should do as they\'re damn well told.

Cheers

Phil Hobbs

Got a boat?

RL

 

[Ralph Mowery]

In article <6v6srghgh40h1tfq0db7g942cjvbjleqda@4ax.com>,
jlarkin@highlandsniptechnology.com says...

Like kitchen ranges and front doors. They should have knobs and not
quit working when you can\'t find your phone or when AWS crashes.

My neighbor has a fake LED fireplace with a remote. He\'s very proud of
it.

I bought a house about 15 years ago with a fire place. Wanted to use it
mainly at Christmas with the whole family. I have only been able to use
it 2 times due to the weather being so hot Yesterday it was 70 deg.
Should be below 50 deg. About 45 years ago I had just gotten married
that summer. Christmas it was about 7 deg F.

I may have to look into the LEDs myself it this keeps up.

This is the middle of North Carolina.

 

[Phil Hobbs]

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.
(plus the base leakage would have lengthened the TC).

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

 

[Rich S]

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

--
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

ahem, well, some of us are still using low f_T devices... B-|
even tho\', that was purely my attempt at being snarky.

 

[Rich S]

On Saturday, December 18, 2021 at 5:38:35 PM UTC, jla...@highlandsniptechnology.com wrote:

On Sat, 18 Dec 2021 11:51:12 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

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

** How about a VHF/ UHF SA for A$220 ?

https://www.ebay.com.au/itm/174645368295?hash=item28a9acd5e7:g:vKgAAOSw7WJgUjkv

Thousands of uses......
..... Phil
Microwave frequency synthesizers can be had for literally 1/1000 of
what they cost 20 or 30 years ago.
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

what is everyone\'s opinion about \"USB scopes\" and \"USB SA\", etc.
where the computer does all human interface & control, and
a little black box handles the in\'s & out\'s.
I think I like it since the laptop has UXGA resolution or better, way
beyond what these stand-alone pieces have.


I\'d way rather have a stack of boat anchors for the same money. My lab
has nearly $2M worth of top-of-the-line test gear (at list prices) that
I\'ve paid probably $50k for over the years.

SDR-style spectrum analyzers are okay for spur chasing, but mostly
useless for the kind of RF stuff I do, which requires low phase noise.

USB things are great for portable use, of course, but AFAICT they tend
to be limited by their software.

The Ocean Optics spectrometers are the same way--the software is
infinitely flexible if you want to spend a week setting it up, but it\'s
a huge pain if you just want to turn it on and measure a spectrum.

Machines should do as they\'re damn well told.

Cheers

Phil Hobbs
Like kitchen ranges and front doors. They should have knobs and not
quit working when you can\'t find your phone or when AWS crashes.

My neighbor has a fake LED fireplace with a remote. He\'s very proud of
it.
--

I yam what I yam - Popeye

Our facilities staff setup a fake \"den\" in one part of the building.
The fake fireplace hosts a flat panel TV, to tightly conform to the space.
The fire video running on continuous loop (they originally used a DVD
player; sometime later, realized a USB thumb drive would do better...)
...At least the TV can be repurposed someday... if it doesnt die first.

 

[Rich S]

On Saturday, December 18, 2021 at 9:56:26 AM UTC, Jan Panteltje wrote:

On a sunny day (Fri, 17 Dec 2021 18:10:31 -0800 (PST)) it happened Rich S
richsuli...@gmail.com> wrote in
eee32e67-f710-4a69...@googlegroups.com>:
Amazing. Someone could set up a garage lab and do some serious stuff
really cheap these days.

** How about a VHF/ UHF SA for A$220 ?

https://www.ebay.com.au/itm/174645368295?hash=item28a9acd5e7:g:vKgAAOSw7WJgUjkv

Thousands of uses......
..... Phil
Microwave frequency synthesizers can be had for literally 1/1000 of
what they cost 20 or 30 years ago.
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

what is everyone\'s opinion about \"USB scopes\" and \"USB SA\", etc.
where the computer does all human interface & control, and
a little black box handles the in\'s & out\'s.
I think I like it since the laptop has UXGA resolution or better, way
beyond what these stand-alone pieces have.
I have several RTL_SDR USb sticks, accuray 1 ppm, range about 30 MHz to 1.8 GHz
cost abut 30$
https://www.ebay.com/itm/272411458376

There is plenty of software for it online, but wrote my own stuff:
http://panteltje.com/pub/xpsa_audio_sinc_filter_3.gif\\old version from 2017,
more option have been added...

These new sticks have a software mod somewhere to go below 30 MHz, but have not needed / used it.
But these things are super cool, I plug it into the laptop and type
xpsa
http://panteltje.com/pub/xpsa-0.7.gif
7.5 cm antenna..

But again there is a lot of open source software online, some with more features, for these sticks
I just write what I need for fun....

Thanks Jan. Fascinating, i looked over the website.
SDRs are a vast area to explore,
if not for testing application, just for fun.
Another thing to add to my \"someday\" list of projects.
(when all those time-demands cease.).

 

[server]

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



--

I yam what I yam - Popeye

 

[Robert Baer]

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.

MAJOR problem: You will be stuck with the Extra charges recurring
from \"prime\".


--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

 

[server]

On Sat, 18 Dec 2021 13:55:38 -0800 (PST), Rich S
<richsulinengineer@gmail.com> wrote:

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

--
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

ahem, well, some of us are still using low f_T devices... B-|
even tho\', that was purely my attempt at being snarky.

Some transistors, like BCX70, have hundreds of ohms of Rbb. I wonder
if that keeps them from oscillating.



--

I yam what I yam - Popeye

 

[Tom Gardner]

On 18/12/21 22:27, jlarkin@highlandsniptechnology.com wrote:

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

That\'s why it was SOP to \"repurpose\" transistors scavenged from
redundant PCBs. My school even had some on the floor in the
\"photographic darkroom\", and my physics teacher was more than
happy for me to take a couple of boards.

 

[Ralph Mowery]

In article <4b13b185-9903-447c-8069-e8aaf65c4c3an@googlegroups.com>,
richsulinengineer@gmail.com says...

Thanks Jan. Fascinating, i looked over the website.
SDRs are a vast area to explore,
if not for testing application, just for fun.
Another thing to add to my \"someday\" list of projects.
(when all those time-demands cease.).

They are for fun. I have one I paid aobut $ 120 and it goes from about
10 kHz to 2 GHz. It will let you set up multi receivers in a 10 MHz
spread. Interisting to try and listen to 4 or 5 ham repeaters at the
same time.

Even the $ 10 to $ 20 TV type SDR that some software lets you listen in
on many other things works well for the price.

 

[John Miles, KE5FX]

On Saturday, December 18, 2021 at 8:44:33 AM UTC-8, Phil Hobbs wrote:
> And with 1000x the close-in phase noise.

They have gotten better lately. More like 10x:
http://www.miles.io/LMX2820_8672A_8663A.png

Of course, the plot that ultimately matters is this one:
http://www.miles.io/capture.png

-- john, KE5FX

 

[Rich S]

On Saturday, December 18, 2021 at 4:51:26 PM UTC, Phil Hobbs wrote:
[snip]

I\'d way rather have a stack of boat anchors for the same money. My lab
has nearly $2M worth of top-of-the-line test gear (at list prices) that
I\'ve paid probably $50k for over the years.

SDR-style spectrum analyzers are okay for spur chasing, but mostly
useless for the kind of RF stuff I do, which requires low phase noise.

[snip]

Indeed, I agree, the boat-anchors deserve love too.
I\'m not kicking them out of the party.
Although todays gear seems more boatier and
less anchory than those of previous generations\'
The labs at work are full of such anchors. (We have
a tradition of buying only new, not used, BTW.)

I have a new test coming up that will need to be
\"mobile\" (fixed location, but in the field). So I\'ll
be investigating what kind of performance is
possible from a small size form factor. And not
requiring an AC mains power generator!

cheers, RS

 

[Rich S]

On Saturday, December 18, 2021 at 10:35:44 PM UTC, Tom Gardner wrote:
[snip]

That\'s why it was SOP to \"repurpose\" transistors scavenged from
redundant PCBs. My school even had some on the floor in the
\"photographic darkroom\", and my physics teacher was more than
happy for me to take a couple of boards.

+1 this. My parts bins still have a some of those
2N404, 2SB74, & other Ge rescues. Scavenging
was my SOP too. Tho\' I long abandoned all
the non-solid-state (tube) stuff.... even a
nice Heathkit tube tester. If I only knew then..

 

[Phil Hobbs]

jlarkin@highlandsniptechnology.com wrote:

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.

You didn\'t have a spare inverter section available?

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

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

 

[Jan Panteltje]

On a sunny day (Sat, 18 Dec 2021 18:00:32 -0500) it happened Ralph Mowery
<rmowery42@charter.net> wrote in
<MPG.3c28321d7ab2556b989ba9@news.eternal-september.org>:

In article <4b13b185-9903-447c-8069-e8aaf65c4c3an@googlegroups.com>,
richsulinengineer@gmail.com says...

Thanks Jan. Fascinating, i looked over the website.
SDRs are a vast area to explore,
if not for testing application, just for fun.
Another thing to add to my \"someday\" list of projects.
(when all those time-demands cease.).




Even the $ 10 to $ 20 TV type SDR that some software lets you listen in
on many other things works well for the price.
They are for fun. I have one I paid aobut $ 120 and it goes from about
10 kHz to 2 GHz. It will let you set up multi receivers in a 10 MHz
spread. Interisting to try and listen to 4 or 5 ham repeaters at the
same time.

Yes, even did GPS reception with my 30$ stick.
This guy showed how to do it:
http://michelebavaro.blogspot.com/2012/04/spring-news-in-gnss-and-sdr-domain.html

scroll down to \'panteltje\' in replies
my test:
http://panteltje.com/pub/run_50_outside_2728000.gif

 

[Jan Panteltje]

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

 

[server]

On Sat, 18 Dec 2021 23:57:23 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
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.

You didn\'t have a spare inverter section available?

It was a military job and we were supposed to use JAN-TX silicon
transistors. I wrote an elaborate bit of nonsense why we had to use a
commercial part (raving about capacitances and stuff) and we got away
with it, out of frankly stated admiration for my BS skills.



--

I yam what I yam - Popeye

 

[server]

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.







--

I yam what I yam - Popeye

 

[Jan Panteltje]

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.