15 Dec
2011
15 Dec
'11
7:04 a.m.
[...], I'm
considering an AGC circuit that doesn't use a bulb, but
instead uses a FET as a variable resistor,
Jim Williams (RIP) did a LOT of
research on this. The bulb
outperformed the FET by a gigantic margin. (just sayin'..) from the AGC is fast compared to the bulb's
warmup/cooldown time.
Also, if the bulb's filament is coiled, as many are, its inductance may
prove to be significant at high oscillator frequencies - I don't know
how much inductance the typical bulb's filament has, but I doubt it's a
characteristic usually controlled for in bulb design.
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