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

[Dan Snazelle]

thanks guys

some really great info

i will try it tomorrow on my day off!





--------------------------------------------
check out various dan music at:

http://www.myspace.com/lossnyc


http://www.soundclick.com/lossnyc.htm


http://www.indie911.com/dan-snazelle
(or for techno) http://www.myspace.com/snazelle


> Date: Tue, 24 Jun 2008 06:43:52 -0700
> From: music.maker at gte.net
> Subject: Re: [sdiy] adding sync to a vco/how does sync work
> To: synth-diy at dropmix.xs4all.nl
>
> 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?
>
> Absolutely yes. I do it with a FatMan synth. The 555 (or 7555 which I
> prefer), the TTL compatible output on pin 3, can be connected directly
> to pin 4 (through a switch).
>
> http://home1.gte.net/res0658s/fatman/hardsync.html
>
> The pulse on pin 3 then resets the timer causing synch. This would be
> "hard synch". Your mention of injecting a pulse into the timing cap is
> one way to implement soft synch.
>
>>or a transistor
>>oscillator? i guess what i am asking is is it a pretty easy thing
>>to add to an oscillator circuit? thanks
>
> I think it really depends on the oscillator topology, some are trickier
> than others. 7555 or 555 based oscillators are a piece of cake.
>
>>also what is the difference between soft and hard sync
>
> My understanding is that hard synch is an absolute reset at the time the
> reset is input is activated regardless of the current state of the
> synched oscillator. Soft synch resets (or not) the synched oscillator
> depending on where it is in it's waveform.
>
> -- ScottG
>
> -----------------------------------------------------------------
>
> -- Scott Gravenhorst
> -- GateManPoly - FPGA Based Polyphonic MIDI LA/FM Synthesizer
> -- GateMan-III - FPGA Based Monophonic MIDI LA/FM Synthesizer
> -- PolyDaWG/8 - FPGA Based 8 Voice Polyphonic MIDI Synthesizer
> -- FatMan: home1.gte.net/res0658s/fatman/
> -- NonFatMan: home1.gte.net/res0658s/electronics/
> -- When the going gets tough, the tough use the command line.
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy