PCB received

A project log for Clockwork germanium

A retro version of Yet Another (Discrete) Clock, with vintage parts

SHAOSSHAOS 04/19/2016 at 01:203 Comments

I've just received 3 PCB of "Germanium NAND" from

It was drawn in gEDA "pcb" software (images generated by OSHPark service):

and represents this schematics:

Also I got 3rd (1958) and 4th (1959) editions of "Transistor Manual" from General Electric Company with more schematics of computer components utilizing germanium transistors:


Andrew Starr wrote 04/19/2016 at 07:35 point

Very nice work guys! Don't forget to file off the breakout stubs :)

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Yann Guidon / YGDES wrote 04/19/2016 at 01:45 point


On my side, I think I have bought too many Ge transistors. If this is possible. A clock might need 100 or 200 transistors but I only have max 100pc of a single reference :-/ there will be some "designing" to do to keep a FF down to 2 transistors but the typical gate you have shown has many analog parts, which cost as much as transistors...

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SHAOS wrote 04/19/2016 at 01:55 point

Capacitor 470 pF and resistor 1K are optional and not required for slow parts...

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