[Open_electroporator] Open ultrasound imaging project/ electroporator

[Nathan McCorkle]

John,
re: "Pulse shape will have to be arrived at by trial and error, using
external observations with oscilloscopes"

the STM32F030CCT6 includes an ADC which looks like it has a typical
sampling time of ~5 microseconds (when using the internal voltage
reference of ~1.2 V) which should be about 200 kHz, which seems more
than adequate. I would really like to capture have the ability to
capture the waveform. Even if it was just for some sort of
future-thought-out self-calibration, or some kind of non-USB storage
solution (MMC protocol for micro SD, RAM until plugged into USB to
dump, etc). I guess in addition to a resistor divider, an op-amp would
be needed to act as an programmable-gain-amplifier (PGA) using
filtered PWM as the set point (base-lining the amp setting might be
done just after pressing the 'zap' button, but before starting the
zap). I wonder if a micropython-supported MCU with a built-in PGA
already exists.

and re: the enclosure and keeping fingers and random stuff from
getting zapped, I've used this style where you have to place the
cuvette into the end of a wand, then push that wand down a horizontal
tube too long for the average finger, where it press-fits into some
spring steel (or spring-loaded metal) contacts (the HV).
http://labrecyclers.com/pics/3926_8.jpg



On Sat, Jun 11, 2016 at 3:09 PM, John Griessen <john at industromatic.com> wrote:
> On 06/06/2016 04:58 PM, Bryan Bishop wrote:
>>
>> Yeah I understand your preference about not wanting cash debt, it makes
>> sense to me. Equity would be more the name of the game
>> from my perspective :-). I don't care so much about a writeup regarding
>> who might buy/why, target demographic seems obvious. But
>> equity regarding kit sales (or whatever) etc would be interesting.
>
>
> I've written up a proposal with an agreement to pay back as product sells
> per product, which
> is not exactly the same concept as equity.  I have no corporation to give
> share divvies of.
> This is for an open hardware product that anyone can copy, so the product
> lifecycle depends on
> how good your cost-reduction-design is more than performance design, and
> even then it is going to
> be short and on to another improved version of it.  I won't offer a
> percentage of the profits from
> following improved products, just the v1.0 as at the end of this project
> product, which is
> spelled out in the proposal libre office doc attached.
>
> John Griessen
>
>
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-- 
-Nathan