[sdiy] RE: [sdiy] Volume control with LDR´s ?

[Czech Martin]

Isn't the characteristic very S-shaped?

Also component tolerances can be a grief.
Useable resistance range ~ 100 or ~ 1000?

A differential amp scheme for driving the LEDs
will overlay a tanh (?) characteristic.

If that all does not really matter, why not give it a try?

m.c.

-----Original Message-----
From: Michael Buchstaller [mailto:buchi at takeonetech.de]
Sent: Mittwoch, 19. Februar 2003 18:29
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] Volume control with LDR´s ?


Hallo friends,

after some good time with a scratchy pot, i asked myself if it would
be possible to build a volume control using 2 LDR´s in series, controlling
the lighting of them anti-parallel (if one becomes more light, the other one will see
less light and vice versa) to replace a volume pot.

Has anybody done this ? If yes, what were your results ?
OK, from time to time i see LDR´s used to control parameters like filter resonance
via an LDR to make it voltage-controllable - but would this work for audio ?

All your opinions are welcome.

Thank you all !


-Michael Buchstaller