Have you wired the connections to the potentiometer (for pitch) the wrong way round? I havent built this circuit but from a few circuit bending things ive done i learnt that wiring a potentiometer the wrong way can cause pitch to go up when you turn anti-clockwise.
Of course i could be totally wrong as well.
NoRMaN PHaY wrote:
Of course i could be totally wrong as well.
NoRMaN PHaY wrote:
> I recently completed an 8-step version of the sequencer/programme r.
> There were three problems with it when I first tested it, two of which
> I located - a solder whisker joining two of the board buses and a dry
> joint on a resistor. The third one is stumping me.
> Row 2 of the sequencer, when the pots are at zero, and the CV out is
> connected to a VCO CV in, the VCO puts out the same pitch as the other
> three rows do when they're at zero. However, when you rotate the pot
> clockwise, the pitch goes down instead of up! On row 1,3 and 4 the
> pitch goes up as expected. Having examined the schemo, I figure the
> problem must be located with some build error either on row S, or on
> the tl072 that is at the output of row 2, however having carefully
> examined the boards, I can't find what I've done wrong! Any
> suggestions? I tried replacing the 072, and resoldered the 2 smd caps
> on the back of it, no effect.
> I'm very pleased with this piece otherwise, it's great, many thanks Ken.
>