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First 10TFF module

A project log for Yet Another (Discrete) Clock

I HAD to finally do this basic "exercice de style" in digital electronics, using some hundreds of transistors and diodes...

yann-guidon-ygdesYann Guidon / YGDES 04/13/2016 at 06:195 Comments

I just routed the first module of the Discrete MOSFET clock. Each 10TFF fits well inside a 1 inch square and works with single sided etching.

Borrowing from http://transistorclock.com/ I made specific footprints for the P and N MOSFETs.

I'm now wondering where I can make them etched by lots of 40.

This is the "noob" version, the SMD version will be funkier :-)


Update: I tried one online service and I think I like it, even got mailed a preview :-D

Yes I know, my paneling is horrible. I'm just testing :-D


Update 20160510: boards delivered !

Discussions

matseng wrote 04/13/2016 at 07:06 point

I used to make a lot of panelized PCBs on 10x10 boards done years back. And I discovered that more often than not I got them v-scored for free by the fab (even if the supplier charged a lot extra for the scoring option) by simply removing the copper- and soldermask-layers where I wanted the scoring to be done.

If I marked them on the milling layer the supplier always mailed me and wanted more money to make the boards. So I always made the PCBs 0.8mm for easy home-cutting in case the fab didn't do the scoring "by mistake" for free... :-)

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Yann Guidon / YGDES wrote 04/13/2016 at 07:08 point

interesting...

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matseng wrote 04/13/2016 at 06:42 point

You should be able to fit four of them on a cheap Chinese 5x5 cm pcb @ $9 for a pack of 10.  Then make them on 0.8mm lab thicknesses and put a 0.3mm wide rectangles of tStop/bStop on the pcb to make the cutting with a box knife a bit easier.

With 0.8 mm pcb you basically only need to score each side once before you can snap the pcb apart 

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Yann Guidon / YGDES wrote 04/13/2016 at 06:51 point

I'm currently panelizing the layout for this purpose :-)

I'm adding a milling of 1mm, just in case...

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Yann Guidon / YGDES wrote 05/13/2016 at 00:36 point

Milling worked well !

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