Sync for VCO1

[zipzap]

Is it possible to implement sync on the vco 1?

[toppobrillo]

hey zipzap, welcome back by the way.. i tried to implement sync a while back on a tri-core vco i was working on that started off as this one.. quickly discharging the integrating cap was easy to do with a FET and a comparator, but it wasn't quite the sound i was after and this led to me trying the reversing direction thing in the thru-zero vco, which is a much better sounding sync IMO..

anyways, recently i was able to play with a Wiard VCO [a tri-core as well] and was surprised to hear that the sync seemed to work on it about like the first method i describe here. i thought it wasn't good enough, but i guess it is- it certainly syncs

playing around with it a bit, i decided it would be neat to try to vary the comparator's threshold to get a variable-sync-width and that was cool, you can see some scope-shots of it here:



you could differentiate the comparators action into a predictable narrow pulse for a more standard operation of course.

anyways, i don't know where the notes i made on this are, i will look for them, but go ahead and give it a shot if you can..

keep posted here,\

josh

[Rykhaard]

Please post it if you find it! I JUST finished Ferric Chloriding a double T.Henry precision VCO. (Intend to use as a VCLFO but if I can get at least a couple of octaves - hey! 2 bonus VCOs! )

[toppobrillo]

precision VCO?

[Rykhaard]

[Strazdas]

I know it's old post, but do someone can post schematics to add sync to TH VCO-1?

Many thanks

[Tim Servo]

Hi Straz,

You can find the VCO-1 schemos on Scott Stites "Birth of a Synth" web site:

http://www.birthofasynth.com/Thomas_Henry/Pages/VCO-1.html

<plug> I also sell "Making Music With the 3080 OTA" and several other Thomas Henry books at http://www.lulu.com/spotlight/Magic_Smoke
</plug>



Tim (plugging away) Servo

[Strazdas]

I've got schematics, but I'd like to have sync (hard or soft or both - no mater) input for this VCO

[Strazdas]

Enyone PLEASE!!!