[Open_electroporator] v0.2 testing today showed switcher working well over range of input levels

[Nathan McCorkle]

Very cool! Nice progress.

On Tue, Sep 12, 2017 at 4:08 PM, John Griessen <john at cibolo.com> wrote:
> The photo attached shows a v0.2 and an old v0.1 to the right.  You can see
> how the drive transistors are small in v0.2, but they are a little higher
> volt rating.  they need more drive volts, but then they are on with a very
> low on resistance,
> and the driving transistor chain is done with dual packaged ones that are
> inexpensive and robust.  Some are on the MCU board so the flat flex cable
> has less effect than before, so less cross talk and ringing due to that.
> There are some big rectangles near the transformer -- they're not
> transistors, but protection diodes keeping the transistors from seeing
> overshoot voltage.
>
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-- 
-Nathan