Hi Alfredo,
There is no third diagram.
Check for solder bridges, or an accidental break/lifting of a track from
soldering or wire trimming. Make sure the transistor really is in the right
way. Sometimes the transistor will have a different pin-out to what is
expected, depending on manufacturer. If you have a transistor tester, use
that to work out which lead is which. The highest reading will be when the
transistor is the correct way around. You'd need to remove it from the board
to do this - or test an identical one from the same batch.
The sine circuit and the sine to saw circuit are almost the same, so if the
sine output is working, you will have a reference.
Using an amplifier with a 100k resistor in series with the input, probe
around that part of the circuit to see where the signal stops. The shield of
the lead from the amp will need to be connected to 0V of the power supply of
the VCO, and make sure the amp is set at it's LOWEST volume when you start.
Ken
Show quoted textHide quoted text
>Hi Ken, thanks for second wiring diagram.
>I implemented everithing included in that two diagrames and there's no
sound at the saw to sine out and S to S shape pot doesn´t do nothing.
>I think everithing is correctly wired and all components have the correct
value etc etc...
>Any other diagran left (third) to up at your site ?
>Any idea what I´m doing wrong or where´s the problem?
>Thanks a lot.
>Alfredo.
>
>
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>
_______________________________________________________________________
Ken Stone
sasami@... otherunicorn@...
Modular Synth PCBs for sale <
http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <
http://www.blaze.net.au/~sasami/>