Hi
Ive recently built a synth based on CMOS chips. I am using a 40106 to generate 2 seperate VCO's, one with Tri and Saw waveforms and another with just the square wave, I am also modulating the 1st osc with an LFO. The square wave osc is being run through a CD4040 so that I can stack 3 different octaves and then being run out to a 100k pot for overall volume. The Tri/Saw is being run through a CD4069UBE to buffer the signal and provide some overdrive, although it sounds more like a basic filter to me. This is then run through another 100k pot as the overall volume for that osc. These two signals are then put through 2 100mF caps before going to a stereo socket.
Everything is working fine except I'm getting a periodic click coming through the speakers, when that happens I can also hear the LFO driving the 1st osc but very quietly, when the click happens again it goes silent and then the process repeats. This doesn't happen when both master volumes are turned right down though. Does anybody have an idea how this signal is leaking through and what are the click sounds and of course how can I fix it.
Any help would be really appreciated.
Thanks
Gface83
Ive recently built a synth based on CMOS chips. I am using a 40106 to generate 2 seperate VCO's, one with Tri and Saw waveforms and another with just the square wave, I am also modulating the 1st osc with an LFO. The square wave osc is being run through a CD4040 so that I can stack 3 different octaves and then being run out to a 100k pot for overall volume. The Tri/Saw is being run through a CD4069UBE to buffer the signal and provide some overdrive, although it sounds more like a basic filter to me. This is then run through another 100k pot as the overall volume for that osc. These two signals are then put through 2 100mF caps before going to a stereo socket.
Everything is working fine except I'm getting a periodic click coming through the speakers, when that happens I can also hear the LFO driving the 1st osc but very quietly, when the click happens again it goes silent and then the process repeats. This doesn't happen when both master volumes are turned right down though. Does anybody have an idea how this signal is leaking through and what are the click sounds and of course how can I fix it.
Any help would be really appreciated.
Thanks
Gface83