[sdiy] ASM VCO tips wanted.....

[Frédéric Piron]

Check that the FET is properly oriented, I had the same problem when i  
build mine and there was the problem.

cheers,

Fred

Le 2 avr. 04, à 10:31, RevTor at aol.com a écrit :

> Hello all, I have my ASM here, and one of the oscillators wont  
> oscillate.  I've gone over the thing numerous times and have replaced  
> the 3140, 311, and the FET (its now a 2n3819 this should be OK right?)
> here's the schemo:
> www.home.swipnet.se/cfmd/synths/friends/stopp/asm1vco-1.1.pdf
> (thanks Gene Stopp!!)
>
> anyway, all the panel controls and jacks check out OK, and all the  
> resistors and caps are the exact same as the other osc (which works)   
> The voltages at the chips are all OK, and the trimpots are okay too.
> The SAW out isnt stuck at +v, but instead I noticed that the voltage  
> at SAW out slowly decreases, and the rate of decrease increases when I  
> reduce the value of the cap on the FET.. : ) follow that?  heheh
> so it basically acts like a very low freq osc.  the panel controls  
> have no impact on this rate either...
>
> so, if anyone has any ideas about this I'd be greatly appreciative!!   
> I'd like to get it fully operational and now that Ive spent many hours  
> mulling over the circuit, i'm officially on a  
> mission!!!!!!!!!!!!!!!!!!!
>
> thanks all,
> see ya at AHNE!!!!!
>
> ~Steve M
> revtor at aol.com
>
>
------------------------------------------------------------------------ 
--------------------------
Frédéric Piron

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