K
kell
- Jan 1, 1970
- 0
I'm looking at using an astable multivibrator, like the one in the
diagram at this link
http://www.play-hookey.com/digital/experiments/rtl_astable.html
running probably at a few tens of kiloherz
to drive a mosfet in a forward converter.
I'll probably run the multivibrator somewhere between 12 and 18 volts.
That will put a reverse bias on the base-emitter junctions of the
transistors
in the multivibrator as the base voltage gets pulled below ground
during oscillations.
I've heard that reverse biasing the base emitter junction affects gain,
but that the effect
is of limited severity. I can live with the loss of a little bit of
gain. But what about the long term effects -- will it damage the
transistors, or will they operate reliably for something like their
normal lifetime if they are not abused otherwise?
diagram at this link
http://www.play-hookey.com/digital/experiments/rtl_astable.html
running probably at a few tens of kiloherz
to drive a mosfet in a forward converter.
I'll probably run the multivibrator somewhere between 12 and 18 volts.
That will put a reverse bias on the base-emitter junctions of the
transistors
in the multivibrator as the base voltage gets pulled below ground
during oscillations.
I've heard that reverse biasing the base emitter junction affects gain,
but that the effect
is of limited severity. I can live with the loss of a little bit of
gain. But what about the long term effects -- will it damage the
transistors, or will they operate reliably for something like their
normal lifetime if they are not abused otherwise?