Yann Guidon / YGDES's Profile

My Pages

"Modified DTL" by TI
02/07/2026 at 00:59 • 3 comments

TTL is just a modification of DTL, itself derived from RTL...

In 1967 you could purchase this chip for about 11USD. Barely enough to build a dumb flip-flop.

Note that ECL would also use transistors as input buffers / impedance adapters but the amplification chain is different and DTL/mDTL/TTL saturate and have a much higher signal swing, much better noise immunity and ... longer cycle times.

The other difference with ECL is the use of complementary transistors, which make it harder to build with old transistors since they are mostly one polarity only. But it's a nice little circuit to analyse :-)
SRC: https://www.facebook.com/photo/?fbid=1419577419961171 (thanks to the author of the macro pictures)
Vintage bipolar analog switch
01/20/2026 at 00:52 • 1 comment

It's not exactly related to Ted Yapo's blog https://hackaday.io/project/162998-the-rise-and-fall-of-pulses/log/158851-a-toy-diode-sampler but it's close...

Inspired by Curious Marc's recent video:

I had to try a sim with Circuitjs and it works like a charm !

Why does it matter to me ?

Because I have struggled a LOT to make a DFF gate with bipolar transistors... I had found a version that looked promising for a latch but it became unstable when connected to other devices.

The insights of this pass gate could probably help solve this enigma at last.

Oh and I should get the polarities right....

And then, there is this gem : https://w140.com/tekwiki/images/9/97/Frye_s4_gate.pdf where the value is sampled at the falling edge, almost working as a DFF but with diodes.
LibreSOC and TinyTapeout pictures @FSiC2024
06/23/2024 at 01:36 • 6 comments

We talk a lot about architectures and semiconductors.

At the FSiC2024 conference in Paris, I saw real integrated circuits and took pictures, including TinyTapeout chips and the LibreSOC samples/prototypes.

I have uploaded some of them on Wikipedia to contribute to the Libre-SOC page.

And here Thorsten showing some TT samples in bare die and QFN package.

And one board demonstrated by @matt venn !

.

View all 42 pages

Things I've Built

1KW LED lighting

2006: I designed and built all the electronics of a store's architectural element. 432 3W Luxeon LEDs split in 9 sectors with independent dimming with my first HTTP-based remote controller...

Lambda

LED desk lamp concept design. 2008

Drosephyia

Working as SubFlower, Igor & I built a sort of electronic plant in 2005 for an exhibition at Biche de Bere art gallery.

Bits

Yann Guidon / YGDES wrote 10/26/2025 at 19:48

"on a besoin de plus de gens passionnés pour nos enfants"

Are you sure? yes | no

Yann Guidon / YGDES wrote 10/13/2024 at 16:51

I feel so smug today.

Not having to include special formatting libraries to output debug messages in VHDL, be like

report character'val(13) & " Init=" & std_logic'image(Init)(2)

Are you sure? yes | no

roelh wrote 05/10/2024 at 12:41

Hi Yann, thank you for following and liking my project #Isetta TTL computer ! Did you notice that you are following 1001 projects (or is that binary) ?

Are you sure? yes | no

Yann Guidon / YGDES wrote 05/10/2024 at 13:07

Hey !!!

thanks back roelh :-)

I thought it was way over 9000 ;-)

Are you sure? yes | no

Mitsuru Yamada wrote 05/20/2023 at 23:57

Thank you for liking, following and my #CMOS Homemade Operational Amplifier ! The offset adjustment is subtle, but ultra-high input impedance characteristics have been achieved. I am planning to conduct further operational experiments from now.

Are you sure? yes | no

Yann Guidon / YGDES wrote 05/31/2023 at 16:10

You're welcome ! I appreciate your works a lot !

Are you sure? yes | no

Mitsuru Yamada wrote 12/16/2022 at 01:46

Thank you for following me ! Recently, while verifying an application for calculating the position of a planet with a homemade floating-point interpreter, I found a case where the calculation stack operation was incorrect, so I updated the interpreter's code.

Are you sure? yes | no

Louis H wrote 11/24/2021 at 01:10

Hi Yann,

Merci for liking and following #MINITEL + ESP32 :))

Are you sure? yes | no

Mitsuru Yamada wrote 02/01/2021 at 06:27

Thank you for liking and following my #Homemade Operational Amplifier !

Are you sure? yes | no

Yann Guidon / YGDES wrote 02/01/2021 at 06:45

You're welcome !
You made me want to try this with Germanium transistors ;-)

This one looks pretty good: http://abload.de/img/je-918_documentation_9ab6k.jpg

Are you sure? yes | no

Mitsuru Yamada wrote 02/01/2021 at 07:17

That's a good idea! Please let me know if you get any results.

Are you sure? yes | no

Patrick LeBoutillier wrote 01/02/2021 at 22:19

Thanks for following #But How Do It Know? 8-bit CPU Build !

Are you sure? yes | no

Yann Guidon / YGDES wrote 01/06/2021 at 19:28

De rien :-)

Are you sure? yes | no

Ken Yap wrote 10/26/2020 at 05:45

Thanks for liking #Irreproducible clock !

Are you sure? yes | no

Ken Yap wrote 10/18/2020 at 21:00

Thanks for liking #6 segments suffice !

Are you sure? yes | no

Dr. Cockroach wrote 08/15/2020 at 10:28

Hey Yann, Thank you for the follow/like of #Starburst :-)

Are you sure? yes | no

Dr. Cockroach wrote 07/29/2020 at 17:52

Thank you kindly Yann for the like/follow for #LLTP - Light Logic Transistorless Processor :-)

Are you sure? yes | no

Yann Guidon / YGDES wrote 10/27/2020 at 03:03

Like LEGO, synth design is something i'll never be able to rid my brain of.

Are you sure? yes | no

Dr. Cockroach wrote 10/27/2020 at 10:50

IKR, I wake up sometimes after dreaming of stuff like this ;-)

Are you sure? yes | no

Michael Möller wrote 06/05/2020 at 20:18

Thanks for the like/follow

Are you sure? yes | no

Yann Guidon / YGDES wrote 06/05/2020 at 20:33

Thanks for sharing ! :-)

Are you sure? yes | no

Ken Yap wrote 02/19/2020 at 20:58

Thanks for liking #Crystal tester !

Are you sure? yes | no

Yann Guidon / YGDES wrote 02/19/2020 at 21:32

You're welcome !
Designing crystal oscillators is a kind of dark magic so any help is welcome :-)

Are you sure? yes | no

Ken Yap wrote 02/11/2020 at 11:31

Thanks for liking #DTL binary clock !

Are you sure? yes | no

Ced wrote 01/22/2020 at 07:53

Hello Yann. Tnaks for following the #Nits Processor !

Are you sure? yes | no

roelh wrote 09/26/2019 at 06:52

Hi Yann, thank you for liking and following the #Kobold K2 - RISC TTL Computer !

Are you sure? yes | no

roelh wrote 04/14/2019 at 19:15

Hi Yann, thanks for liking and following the Kobold computer project !

Are you sure? yes | no

Yann Guidon / YGDES wrote 04/14/2019 at 19:19

You know I LOVE TTL computers :-P

Are you sure? yes | no

roelh wrote 04/12/2019 at 07:03

Yann, thanks for re-liking #1 Square Inch TTL CPU. Did you see my new Kobold computer project ?

Are you sure? yes | no

Morning.Star wrote 01/19/2019 at 16:42

Damn, do I have to build EVERYTHING myself? :-D

Thanks for another, #The House Of Fun

Are you sure? yes | no

Yann Guidon / YGDES

Proud member of

My Projects

Projects I Contribute To

My Hackerspaces

My Lists

Hexadecimal displays

My Pages

Things I've Built

1KW LED lighting

Lambda

Drosephyia

Projects I Like & Follow

Share this profile

Bits

Become a Hackaday.io Member

Send a private message to Yann Guidon / YGDES

Become cool instantly

Report user as inappropriate