[sdiy] Radio Controlled Synth ?

[Tom Wiltshire]

On 9 Jul 2007, at 09:58, Needham, Alan wrote:

> Now there's an idea ...
> the signal to an RC servo is a series of 5v pulses, pulse width
> modulated for position, it souldn't be too hard to average this
> to get a crude voltage control signal, a useful signal shouldn't
> be impossible.
> 	Alan - lost the plot again!

Yes, I've played with these too. It'd be easy to filter the pulses to  
get a CV output, much like the PWM output on my own EG or LFO  
project. The problem is that the PWM output for RC is at a much lower  
frequency (can't remember of the top of my head, but might be as low  
as 50Hz) so you're going to need a filter with a very low cutoff to  
remove any ripple.

T.