Tweakers' Asylum

That's cool....but....

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doodlebug

(A)

In Reply to: Melos had such a scheme before... posted by pmkap on December 23, 2004 at 18:59:46:

would it still qualify as a 'passive' preamp if it still needed a power supply to operate? Not trolling, either.
BTW, the Hafler Iris preamp from the mid-80s used opto-electronics to control the volume in a bridge arrangement. They sold out to Rockford as this preamp hit the market so it didn't get much attention then and now. It used old TTL control circuitry, too.
Cheers,
David

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Re: That's cool....but.... - Chris_F 04:36:10 12/24/04 (1)
I would say that it does because the entire chain that the signal sees is deviod of active components. The power is only needed for the light source which is separate from the signal path and the photo-element is just a fancy variable resistor. If you wanted to you could leave the light source out and just use your room lighting to control volume (yikes!).
- Neat idea......n/t - doodlebug 10:05:30 12/25/04 (0)
  n/t

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