[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.

-- 
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Brooke Clarke
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