Jim Thompson\'s site...

[Tom Del Rosso]

Phil\'s archive of Jim\'s site has 139 files compared to web.archive.org
which has 290.

https://electrooptical.net/static/oldsite/www.analog-innovations.com/SED.html
https://web.archive.org/web/20180808224712/http://analog-innovations.com/

I was looking for the 2-transistor staircase generator he posted ~20
years ago, but can\'t find it at either site.


--
Defund the Thought Police

 

[Fred Bloggs]

On Saturday, May 13, 2023 at 4:39:22 AM UTC-4, Tom Del Rosso wrote:

I was looking for the 2-transistor staircase generator posted ~20
years ago, but can\'t find it at either site.

http://www.seekic.com/circuit_diagram/Basic_Circuit/SQUARE_TO_STEP.html

more involved, but adjustable, needs translate from Japanese:

https://ja9ttt.blogspot.com/2010/09/staircase-waveform-gen.html

There are plenty of examples using UJT, so replace the UJT with two transistors to get what you\'re looking for.

--
Defund the Thought Police

 

[John Larkin]

On Sat, 13 May 2023 05:41:02 -0700 (PDT), Fred Bloggs
<bloggs.fredbloggs.fred@gmail.com> wrote:

On Saturday, May 13, 2023 at 4:39:22?AM UTC-4, Tom Del Rosso wrote:


I was looking for the 2-transistor staircase generator posted ~20
years ago, but can\'t find it at either site.

http://www.seekic.com/circuit_diagram/Basic_Circuit/SQUARE_TO_STEP.html

The explanation is not literally true.

more involved, but adjustable, needs translate from Japanese:

https://ja9ttt.blogspot.com/2010/09/staircase-waveform-gen.html

Yikes!

There are plenty of examples using UJT, so replace the UJT with two transistors to get what you\'re looking for.







--
Defund the Thought Police

 

[John Robertson]

On 2023/05/13 1:39 a.m., Tom Del Rosso wrote:

Phil\'s archive of Jim\'s site has 139 files compared to web.archive.org
which has 290.

https://electrooptical.net/static/oldsite/www.analog-innovations.com/SED.html
https://web.archive.org/web/20180808224712/http://analog-innovations.com/

I was looking for the 2-transistor staircase generator he posted ~20
years ago, but can\'t find it at either site.

Did you try other dates in web.archive.org\'s archive of Jim\'s site?
Perhaps it was listed for a while and then taken down for some reason or
another...

Are you sure of the title of the schematic?

John :-#)#

 

[Fred Bloggs]

On Saturday, May 13, 2023 at 10:13:36 AM UTC-4, John Larkin wrote:

On Sat, 13 May 2023 05:41:02 -0700 (PDT), Fred Bloggs
bloggs.fred...@gmail.com> wrote:
On Saturday, May 13, 2023 at 4:39:22?AM UTC-4, Tom Del Rosso wrote:


I was looking for the 2-transistor staircase generator posted ~20
years ago, but can\'t find it at either site.

http://www.seekic.com/circuit_diagram/Basic_Circuit/SQUARE_TO_STEP.html
The explanation is not literally true.

more involved, but adjustable, needs translate from Japanese:

https://ja9ttt.blogspot.com/2010/09/staircase-waveform-gen.html
Yikes!

There are plenty of examples using UJT, so replace the UJT with two transistors to get what you\'re looking for.

Didn\'t take a minute to find the original the OP was referring to. It\'s just an old standard UJT relaxation oscillator adapted to transistors:

https://electrooptical.net/static/oldsite/www.analog-innovations.com/SED/CP-Style-Counter.pdf

It\'s not as good as the seekic circuit, which buffers everything, but otherwise works exactly the same. No one would use this old stuff these days. Pick up a D/A off ebay for a few dollars and wrap some MSI logic around it, and you have a much more precise circuit that works over a much wider range of frequency.

--
Defund the Thought Police

 

[Tom Del Rosso]

Fred Bloggs wrote:

Didn\'t take a minute to find the original the OP was referring to.
It\'s just an old standard UJT relaxation oscillator adapted to
transistors:

https://electrooptical.net/static/oldsite/www.analog-innovations.com/SED/CP-Style-Counter.pdf

Thanks. I looked through most of them and overlooked it.


--
Defund the Thought Police

 

[Fred Bloggs]

On Sunday, May 14, 2023 at 1:14:10 PM UTC-4, Tom Del Rosso wrote:

Fred Bloggs wrote:

Didn\'t take a minute to find the original the OP was referring to.
It\'s just an old standard UJT relaxation oscillator adapted to
transistors:

https://electrooptical.net/static/oldsite/www.analog-innovations.com/SED/CP-Style-Counter.pdf
Thanks. I looked through most of them and overlooked it.
--
Defund the Thought Police

I used \"staircase\" search term in google groups SED, and it came right up. The original link to analog-innovations redirects to electrooptical.net.

 

[John Larkin]

On Sun, 14 May 2023 13:11:55 -0400, \"Tom Del Rosso\"
<fizzbintuesday@that-google-mail-domain.com> wrote:

Fred Bloggs wrote:

Didn\'t take a minute to find the original the OP was referring to.
It\'s just an old standard UJT relaxation oscillator adapted to
transistors:

https://electrooptical.net/static/oldsite/www.analog-innovations.com/SED/CP-Style-Counter.pdf

Thanks. I looked through most of them and overlooked it.

Lot of junction drops.

 

[Phil Hobbs]

Fred Bloggs <bloggs.fredbloggs.fred@gmail.com> wrote:

On Sunday, May 14, 2023 at 1:14:10 PM UTC-4, Tom Del Rosso wrote:
Fred Bloggs wrote:

Didn\'t take a minute to find the original the OP was referring to.
It\'s just an old standard UJT relaxation oscillator adapted to
transistors:

https://electrooptical.net/static/oldsite/www.analog-innovations.com/SED/CP-Style-Counter.pdf
Thanks. I looked through most of them and overlooked it.
--
Defund the Thought Police

I used \"staircase\" search term in google groups SED, and it came right
up. The original link to analog-innovations redirects to electrooptical.net.

We aims to please.

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