[Open_electroporator] engineering is balance of cost and performance (was: switching PS parts)

[John Griessen]

On 11/10/2013 05:10 AM, Nathan McCorkle wrote:
> How about this, it seems like plenty of inductance, is stocked on
> digikey for ~$3, says 'Dielectric Strength (P/S)' is 6.5kVDC,

It says line matching...  it might not have much copper and so not much current handling,
and the magnetic material too.   it takes some looking at specs and knowing what you want...

before you can choose.

I can't spend time on it right now...  shopping for a complete thing aimed at the purpose is
quicker and what I've done in finding some Chinese suppliers of flyback transformer/inductors.
That has some specifying before buying also, but mostly for deciding how small and low
cost it can be.

If you want to make something, a HV flyback from any junk CRT will do, but then
how do you duplicate it to sell?  This discussion is about developing low cost to sell, not DIY
from junk pile parts, right?

Look how cheap these are -- $1.8+shipping:
http://www.alibaba.com/product-gs/357136589/FLYBACK_TRANSFORMER.html

Those two knobs on its side mean it even has some passive parts integrated adjustable
R's and some capacitance...   Question is what volt range can it do, and is there
a smaller one for just 2kV instead of 7 or 12 kV?    No time to ask right now.
It will have a dielectric strength of insulation in the many tens of kV,
so it can operate for years at something like 7kV.  It also has design features on all
exposed surfaces for HV and how that attracts dust and then the dust and moisture can
break down, arc and burn.  The line matching function of the above part has none of that
design -- its  6.5kVDC "strength" is just there to protect against occasional surges
from lightning strikes.

  what
 > does P/S mean?

Searched.  Can't find except a mention of P-S in another datasheet.
Volts /distance is Dielectric Strength definition.  P/S or P - S don't match.
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