[sdiy] Question about a mod on a LFO.....

[harrybissell]

The theremin method will be very complex...

If you touch IC1-B pin 7... and touch IC1-C pin 2 your skin
resistance will change the oscillator frequency. Maybe make the
100K pot a 1M pot for better effect.

This is probably OK, but be sure that your circuit is powered from a good
supply isolated from the AC line or some (bad) surprise might result.

A true VCO...with the input voltage provided by a 9V battery and your
skin resistance (press harder and the speed goes up) would be much
safer....and you could filter the voltage so that 50/60Hz hum is not picked
up.

H^) harry

mathieu.vallet1 at free.fr wrote:

> HI!
> i'm french so excuse me for bad english
>
> So I built the Ray's lfo oscillator from the url:
> http://www.musicfromouterspace.com/analogsynth/coolnewlfo.html
>
> But
>
> How can I use a metal plate copper or Theremin antenna instead of the
> Frequency's pots of 100k, Is that possible?? I want to activate the sound when
> I touch a metal plate copper or antenna ( more and more I approach the antenna
> with my hand and more and more the frequency  is high , or more and more I
> touch a side of the metal plate copper and more and more the frequency is
> high).
>
> thanks  if you can help me