Re: AF Osc AGC alternatives to lamp/thermistor/FET

piglet <erichpwagner@hotmail.com> wrote:

Yesterday in the thread "Random thoughts on sinewave oscillators" I
posted a LT Spice wirelist showing amplitude levelling without fet, ntc
thermistor or ptc filament instead using current steering long tail pair
- kinda poor mans multiplier.

How about using a lamp as the gain-controlling element at a low signal
level, so it doesn't self-heat, then heating it with superimposed D.C.
from some sort of voltage comparator/rectifier which is separate from
the signal path ?

It might have to be in some sort of bridge circuit, so that any noise on
the heating current doesn't appear in the signal.


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~ Liz Tuddenham ~
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