[sdiy] adding sync to a vco/how does sync work

[Tom Wiltshire]

On 24 Jun 2008, at 14:29, Dan Snazelle wrote:

>
> I have been finding some great uses for sync lately. i am wondering  
> how easy or hard it is to add sync to a schematic that does not  
> call for it. is it as easy as injecting a pulse wave into the  
> timing cap?
>
> for instance, the FARM VCO I doesnt have sync (i dont see it at  
> least) how hard would it be to stick it in somewhere?
>
> http://www.aleph.co.jp/~takeda/radio/img/farmVCO-scheme.gif
>
> is it possible to add it to a 555 oscillator?

Doesn't a 55 timer have a "Reset" input? I think you can do sync on  
one of those by pulling that low momentarily.

T.