PW causes pitch change on AS3340 VCO

[Dud]

If this problem come from the chip, there’s somewhere a solution because all mine don’t do that.

a lot of thread about CEM/AS but maybe this one can be a way ?

1222 Tuner VCO Module fixes/improvements

These informations are all over the place, so let’s summarise them here. “Mandatory Fix” (even if your module seems to work): replace R42 (220R) with a resistor between 1K and 4K7. With 220R the LM4040 is way out of its maximum rating and causes wobbling of the pitch, or it could just be destroyed. Look here Easy (no excuses to not do them if you build a new 1222): replace the L7805 with a L7808 because the Arduino is powered thru Vin not +5V. add a resistor between pins 4&5 of the 3340 …