[sdiy] Volume control with LDR´s ?

[Steve Thomas]

Ah ..the famous light-operated  POTs of the BBC/Radiophonic workshop! I 
read about these in the '25years of the BBC RPW' book. Sounds cool..
and an interesting analogue alternative to optical encoders!


cheers
steve thomas




> 
> > Has anybody done this ? If yes, what were your results ?
> 
> EMI mixing desks from the 1960s, and various early BBC desks too I
> believe.
> 
> E.g. EMI REDD:
> http://www.synthpunk.com/images/REDD.jpg
> 
> As I recall, they had a fixed lamp and LDR, and the fader moved a smoked
> glass or shutter between the two gradually cutting off the light to the
> sensor.  No scratchy contacts to worry about.
> 
> Ask Steve Ridley, I'm sure he's met similar beasties.
> 
> Neil
> 
> --
> Neil Johnson :: Computer Laboratory :: University of Cambridge ::
> http://www.njohnson.co.uk          http://www.cl.cam.ac.uk/~nej22
> ----  IEE Cambridge Branch: http://www.iee-cambridge.org.uk  ----
>