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My first tape-outs
03/29/2026 at 16:50 • 0 comments

This week I have had the chance to submit 8 designs to TinyTapeout ! Actually, 4 designs adapted to 2 nodes:

SG13G2:
https://app.tinytapeout.com/projects/3747 : https://github.com/ygdes/ttihp-HDSISO8
https://app.tinytapeout.com/projects/3758 : https://github.com/YannGuidon/miniMAC_tx
https://app.tinytapeout.com/projects/4039 : https://github.com/ygdes/ttihp-HDSISO8RS
https://app.tinytapeout.com/projects/4049 : https://github.com/YannGuidon/TinyScanChain

CMOS5L:
https://app.tinytapeout.com/projects/4130 : https://github.com/YannGuidon/ttihp-HDSISO8_5L
https://app.tinytapeout.com/projects/4131 : https://github.com/YannGuidon/ttihp-HDSISO8RS_5L
https://app.tinytapeout.com/projects/4132 : https://github.com/ygdes/TinyScanChain5L
https://app.tinytapeout.com/projects/4137 : https://github.com/ygdes/miniMAC_5L

There are shift registers and experiments with the storage density, with an eye on reviving #DTAP - Debug and Test Access Port

And there are attempts to implement #miniMAC - Not an Ethernet Transceiver but they did not succeed. At least the Hammer18 circuit is working well but the gPEAC18 couldn't be ported.

But I'm indescribably thrilled and I can't thank the Tiny Tapeout team enough.

And Jeremy for sponsoring my first 2 tiles :-D
"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.

View all 43 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

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

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Mr. Piay wrote 01/12/2019 at 19:59

Hi Yann, I'm glad my project #RELAY COMPUTING is of interest to you. I hope you will find my project #SANX-I MICROCOMPUTER interesting as well. Best regards, Javier

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Dr. Cockroach wrote 12/26/2018 at 10:52

Hey there Yann, thanks for the Christmas Like and I feel that the new year will be great for all of us :-D Yes the scope will be a big player to my fun and learning in 2019 :-)

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Morning.Star wrote 12/10/2018 at 07:44

Hey buddy, thanks for another :-) #Scrap Tools

Not long to go now, soon be in my new workshop, yay! :-D

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Yann Guidon / YGDES wrote 12/23/2018 at 04:30

You will finally have enough room to deploy your tentacles :-P

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Morning.Star wrote 12/23/2018 at 07:04

😁 This place is cavernous compared to the old one. It's eaten my 10 foot cube crapmountain no trouble.

Yep. 😉 mill, forge, cast, weld, flight, windpower, resin mould, spray finsh... Tesla coil, etc... Muahahah!

Deploy. Such a great word my friend lol. Merry Techmass dude 🎅

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Morning.Star wrote 12/04/2018 at 07:29

Hey Yann, thank you for a double whammy #DisplayBug :-D

... I cant be serious for long XD

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roelh wrote 11/22/2018 at 10:38

Hi Yann, thanks for liking and following the #2 Transistor 4 state FlipFlop !

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Yann Guidon / YGDES wrote 11/23/2018 at 10:48

As usual, I enjoy your designs :-)

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Dr. Cockroach wrote 10/14/2018 at 07:33

Hey there Yann, thanks for the follow & like for #Light Logic :-)

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roelh wrote 10/14/2018 at 07:19

Bonjour Yann, thanks for following and liking the One Square Inch TTL CPU, https://hackaday.io/project/161251-1-square-inch-ttl-cpu !

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Morning.Star wrote 09/19/2018 at 05:47

Ahoy there Yann :-) Thanks for liking and following #Smallest 4x4x4 LED Cube Yet ! Sorry about the rules of physics. Again. They are a bit bendy... XD

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Bharbour wrote 09/17/2018 at 23:51

Hi Yann, Thanks for adding my hex display to the list. I had no idea more than one person had messed with this problem!

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roelh wrote 08/17/2018 at 17:25

Hi Yann, thanks for following and liking the 4-bit TTL ALU, https://hackaday.io/project/160506-4-bit-ttl-alu !

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roelh wrote 08/05/2018 at 11:19

Hi Yann, thanks for being the first one that liked and followed my DCTL ALU design, https://hackaday.io/project/160177-alu-in-dctl-technology !

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Yann Guidon / YGDES wrote 08/05/2018 at 11:52

You're welcome !

I like your work and I wouldn't miss a DCTL design :-P

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Dr. Cockroach wrote 07/17/2018 at 10:04

Good morning Yann and thanks for the follow and like for #ColorChord - A Steampunk inspired creation :-D

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Ed S wrote 04/22/2018 at 17:05

Thanks for liking our #OPC-5 - a CPU for FPGA, in one page project, YG, which has grown now from the 16-bit OPC-5 to the more capable but still 16-bit OPC-6 to the simpler but larger 32-bit OPC-7 - and each of them just one page!

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Yann Guidon / YGDES wrote 04/22/2018 at 20:49

Yay ! I see the progress, it is inspiring :-)

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Bharbour wrote 04/20/2018 at 03:33

Thanks for following me!

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danjovic wrote 04/20/2018 at 01:28

Hi Yann! Thanks another time for the likes!

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ActualDragon wrote 04/09/2018 at 15:07

Thanks for all the likes yann :D

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Eric Hertz wrote 04/01/2018 at 03:50

Hey Yann! Thanks for the likes, and more! Good luck this year!

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roelh wrote 03/31/2018 at 07:22

Hi Yann, thanks for liking the one transistor flipflop, https://hackaday.io/project/112126-one-transistor-flipflop !

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Dr. Cockroach wrote 03/30/2018 at 23:45

Hey Yann and thanks for the follow and like for the Cardboard relay :-)

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Yann Guidon / YGDES

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