[Open_electroporator] Culture Shock yardboard testing

[Nathan McCorkle]

Hmm, aren't the diodes going to dump before you turn on the pull
transistor, making the transistor ineffective when you do finally turn it
on (assuming these are zener diodes)?
On Jun 24, 2016 6:41 PM, "John Griessen" <john at industromatic.com> wrote:

> I had thought I would be able to "just use some test equipment" to make
> push and pull pulses to drive a push-pull converter rig up on the
> yardboard,
> but I don't have any old school 555 timers handy, and my pulse generators
> don't have
> enough features built in to do that without creating logic inverters and
> flip flops,
> (which is what a 555 timer is).  So, the immediate idea
> that comes up when you ask, "What to do?", is just start using a micro
> running micropython
> and code those non-overlapping pulses just like the final product will
> need...
>
> So now I dive into that in order to get transformer tests going that use
> push pull.
>
> The sketched schematics attached show the differences in circuitry without
> the non-overlapping part.
> Not a big deal, and will easily fit on the yardboard with some extra 20
> gauge copper wiring -- no
> need to etch another board.  Then the non-overlapping pulses part will be
> a nucleo-F401RE on a
> plugboard with rows of 0.1 inch holes.
>
> Once I have a transformer test, and Sunday at the latest, I will ask for
> quotes and design review from
> Ningbo Eilux.  then as samples are made in China, I will get busy making a
> pcb layout for an STMF401
> and a STMF030 microcontrollered switching power supply.
> The chips drop into similar but not exactly same footprints, so two
> versions if time is available.
>
> Want me to order you a nucleo-F401RE Nathan?
>
> John
>
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