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

[Dan Snazelle]

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? or a transistor oscillator? i guess what i am asking is is it a pretty easy thing to add to an oscillator circuit? thanks

also what is the difference between soft and hard sync


all help appreciated





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