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

[harrybissell at wowway.com]

Using two transistors might increase the leakage and affect the
overall performance.  The EFM VCO4(d,e) used two FET transistors
for this. Its easier to inject the sync pulse into the comparator.

H^) harry


On Tue, 24 Jun 2008 17:08:22 +0200, Florian Anwander wrote
> Hi Dan
> 
> > 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
> If I understand it right (others may correct me): in this schemoe 
> you should double Q1 and feed the sync signal to the base of the 
> second transistor.
> 
> Florian
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Harry Bissell & Nora Abdullah 4eva