Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I would like to make some semi-scientific testing of this stuff.
due to the more recent problems i really need to do the testing,
no way around.

what do you think are proper methods?
do you think etching of the boards is required for testing?
i can certainly see some of the faults before etching after removing the
paper.
i have problems with brittle toner, but i also discovered "etching
through"/underetching
in some areas (preferably large pads), where the etchant obviously comes
in
contact with copper it should never see.
it is not etched away completely, but the dull red, you surely know. i
don't like this.
I thik one might not see this before etching.


I will fire up the fuser unit, i will design a thermostat for it this
instant.
(may put one of these newly aquired solid state relays to use...)

////
talking of the new stuff..

Is anyone here who has experience with IGBTs? i need know if i can connect
the transistors of a IGBT module in parallel and what to do with the gate
signals.
i want to use a 6 igbt 70A module as one big igbt, i figure i can use
either the upper 3 or lower 3 transistors, if anyone knows about IGBTs i
would
very appreciate a email, because it is not exactly list stuff i think.
thank you.

back to on topic
////

so i have one HP LJ, one clothes iron, one digital thermometer with small
probe,
one copier fuser unit with adjustable temperature and pressure, one really
big
box of pcb stock, and the photo paper which did work in the past already.

How to go about this?
How would you do the testing?

ST