[sdiy] optical theremin, 555 cool stuff (it's all in the duty-cycle)

[anthony]

>> Here is a good optical theremin circuit: (Hey did I find this link here?)
>> http://www.baragon.8m.com/555.jpg
>>
>> Don't build the lumivox the way the schematic / picture shows it.

> Lot's of people from the (circuit)benders group build it, and i have yet 
> to hear
> about one who made the LDR controlled volume work. Pitch work reasonably 
> well.
>
> Someone with a better understanding of electronics than me can surely 
> explain
> why - my guess is something like an 8 Ohm speaker getting all choked from 
> the
> much higher resistance of the LDR, a simple transister amplifier stage 
> might
> work wonders here.
>
> Mikael
>

Yeah I meant to mention that for the volume a photovoltaic cell and a 
transistor
works really well. Lemme find the link...