newbie asks: current/true voltage contolled vco?

Michael Schmid michael.schmid at gmx.at
Sat Apr 8 23:58:05 CEST 2000


I'm building the modular of penfold's book

http://aupe.phys.andrews.edu/diy_archive/schematics/synths/penfold/penvco.html

"The VCO", he writes, "remains a current rather than a true voltage
controlled type." Sorry for my newbieness, but what's the difference.

Btw: it didn't work the first few times, but as I touched the pcb with
my fingers by accident, it functioned. I bridged some solder jonts of
IC2 (CA3046) ...

... and it worked. Guess which: Pin 3 (emitter of Q1 and Q2, which are
not used anyway) is bridged with 12 (base of Q5) and 13 (emitter of Q5).

Maybe someone can explain this.


Thanks a lot,

Michael
(Could you please stay in an electronicnewbiespeech?)



--
michael schmid //  linz // austria
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