[DIYbio] DC-to-DC boost switching power supplies for electrophoresis, electroporation

On 02/23/2013 04:48 AM, Nathan McCorkle wrote:
> I just found this 3Vdc to some higher voltage (around 200 I think, but
> I dunno if that's AC or DC) power supply schematic along with most of
> the parts for $5
> http://www.goldmine-elec.com/pdf/G17891.pdf
>
> What do you think?

That diagram is a pulse generator for flashing that flash tube once, not generating a DC level.

I'm overloaded with to do's right now, but I've been advocating for a collaboration
on a low cost
DC-to-DC boost switching power supply
for a while, and I will help make a safe design That can be offered as a kit for $25,
and have features like safety interlock,
(if you connect a switch to a door that actually exists and surrounds the high volts so as
to protect the user).

This is Analog's page on DC-DC switcher IC's:
http://www.analog.com/library/analogDialogue/archives/45-12/buck_boost.html

TI bought National, and here's a 100V IC for $2 in tens qty that can be driven from a battery.
http://www.ti.com/product/lm5020

Remember that as soon as you try to charge the battery at same time as outputting volts
you have a safety problem since your HVDC is not isolated from the building ground anymore
and you could be putting volts on the case of nearby instruments/equipment.

If you don't want to run from batteries, this chip is not all you need to be safe,
you also buy some wall wart to get an isolated, (floating wrt building ground), DC voltage
to input to it instead of a battery.

Is 100 Volts enough to start with?

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