TS-type problem. Ticking sound?

[tyzjames]

Hi,

I just built a TS-type pedal and I've got this weird problem. When volume is down, there is a fast ticking noise, like 300bpm. Its a little more faint when the volume is turned up. This noise goes away when I engage another pedal AFTER this pedal. I've been trying to troubleshoot but no luck yet. Connecting a 1uF elec cap and above from output to ground removes the noise. Anyone encountered something like this so far?

Thanks,
James

[R O Tiree]

Which schematic are you using, please?

[tyzjames]

Hi Tiree,

I'm using this:


Without the flipflop switching. Input and output buffers are MPSA18

[R O Tiree]

OK, that's a bog-standard TS schem... next question, which layout are you using, please?