Schadenfreude wants to tap, tap, tap

[jeffwhitfield]

Hey folks, just finished a Schadenfreude a few days ago. I think it's working...but I'm getting a weird tap from it whenever it's engaged and I'm not playing. It's at a rhythm of ever 2 seconds and appears to be coming from the CD4046BE. I switched it out and it doesn't seem to fix it. Could it be I'm using the wrong CD4046? Or maybe the 100n film caps I'm using need to be changed out? Thx in advance.

 

[Chuck D. Bones]

Have you tried a different power supply? I have a 9V PS that does not like powering 4049s running in linear mode.

A 1K resistor in series with the power (downstream from the LED) might just fix it. I think running CMOS in linear mode on 9V is a bad idea. I get less current draw and more gain by reducing the Vcc.