13 Dec
2011
13 Dec
'11
6:54 p.m.
> I once built a phase-shift oscillator [...]
> I considered trying to build some kind of AGC for
it, but never
> actually got the round tuits for that.
Perhaps an incandescent light bulb might help out
there. =)
Perhaps. But it requires enough current flowing in the feedback
divider to warm the bulb's filament significantly. I'd rather avoid
dissipating that much power - not to mention that I'm not sure the
op-amp I was using was capable of it.
It also requires the bulb. I have very few incandescent bulbs that are
neither mains-voltage bulbs designed for illumination nor embedded into
devices that (a) are not easy to extract them from and (b) are not
devices I'd want to rob for parts. (Not that my lack of suitable parts
means there's anything inherently wrong with the technique, of course.)
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