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echo: electronics
to: Thom Kouwenhoven
from: MIKE ROSS
date: 2003-01-05 14:57:20
subject: I/F

"Thom Kouwenhoven" wrote to "MIKE ROSS" (05 Jan 03  18:27:28)
 --- on the topic of "I/F"

 MR> I think it has to do with the C-E impedance of the saturated
 MR> transistor. It will conduct a low level current in both directions. I
 MR> haven't experimented the exact mechanism but I suspect it's because
 MR> the B-C junction becomes forward biased and let's a little emitter
 MR> current
 MR> through, sort of behaving as the 2-diode simplified model.

 TK> Yes...i think you are right...that would solve a lot of this mystery.
 TK> The base-collector current biasing the collector...hmmm...that must be
 TK> it.

I'll bet it works even better with a Darlington...


 MR> ... Unless its output has broken out in parasitic
 MR> oscillations...

 TK> ROFL!...and souping up all the power of the EL34s in the main stage
 TK> :-)

Cheap way to make a power soaker! 
Just have to keep an eye on the colour of the plates, much beyond orange
things go "BOOM"! I've literally seen glass melt from plates in fusion.
The radiated heat really does get the glass hot enough to melt.

 Mike
 ****

... That was a fascinating period of time for electronics
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