photodiode controller

[J. Larry Hendry]

Well, certainly you can produce CV from the difference between two RF
signals as is done in the PAiA Theremax.  In fact, the PAiA has a circuit
included that produces CV.  I think you could count on about 18" of hand
movement sensing depending on adjustment, antenna or plate, etc.
Larry Hendry

----------
> From: Stewart Pye <stew at uq.net.au>
> To: synth-diy at mailhost.bpa.nl
> Subject: photodiode controller
> Date: Sunday, February 28, 1999 5:59 PM
> 
> Hi..
> 
> I'm building a controller for CV and midi and thaught I'd try a photo
diode
> recieving a 10kz signal being reflected by the hand from an led right
next
> to the photodiode. This is then demodulated and filtered as in Elector
> march 1983 pg55.
> 
> Elector says it will measure distance up to 6 or 8 inches. Does anyone
have
> a better suggestion for sensing hand movement??? Longer range would be
> better. I'm using a microcontroller so the transmitter cicuit fom elector
> can be simplified.
> 
> 
> 
> Thanks 
> Stewart Pye 
> 
> 
>