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

[Theo]

A typical application of resistive optocouplers is volume control in
high-end applications.
Check the manufactures website for examples, a google for "vactrol" should
get you started.
The "fader law" partly depends on what configuration you pick.
Think your 2 LDR solution might not be the best pick for volume control.

Theo


----- Original Message -----
From: Michael Buchstaller <buchi at takeonetech.de>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, February 19, 2003 6:28 PM
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
>