[Milsurplus] Re: Germanium diodes
Brooke Clarke
brooke at pacific.net
Wed Jan 23 12:27:58 EST 2008
Hi:
I question if the Germanium material was a problem on hot summer days or if it
was the circuit design. I seem to remember a college class where we designed
amplifier stages using Germanium, Silicon and tubes. In order to maintain the
operation point (Ic & Vc) over temperature required strong feedback on the
Germanium. With no feedback the Germanium would saturate or open (forget
which), but with proper design worked fine.
For a common emitter amp the feed back is a resistor in series with the emitter
and bypassed by a cap. That stablizes the Ic, Vc over temperature.
--
Have Fun,
Brooke Clarke
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