sequencer wah "ticks" when switched off

Started by ugly_guitar_guy, June 14, 2011, 11:43:12 AM

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ugly_guitar_guy

So I finally got my sequencer wah (like Zvex Seek Wah) finished, and it really does sound awesome, but when the effect is switched off I can still hear a very quiet "tick-tick-tick-tick...." from the clock circuit coming through the amp. I can only guess that this is happening through the ground, even though I did my best to separate them as far apart as possible. I even tried putting in a 10M to ground resistor on the circuit, but then the pedal didn't want to work at all. Are there any thoughts on how I can eliminate this problem because I really want to use this pedal in my live pedalboard?

Thanks!
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Morocotopo

Maybe a low value resistor in series in the power line would limit current surges...(100R or so) I had an Easyvibe that bleed ticking to the other pedals through the power, and that took care of it.
Morocotopo

Mark Hammer

Any time you have a clock-like circuit, you are at risk for ticking.  Could be an LFO, could be a sequencer "stepper".  Same thing.

ugly_guitar_guy

Quote from: Mark Hammer on June 14, 2011, 02:14:14 PM
Any time you have a clock-like circuit, you are at risk for ticking.  Could be an LFO, could be a sequencer "stepper".  Same thing.

Well, the odd thing is that I have the sequencer set to inhibit and stay at stage 1 when it's switched off, so I don't understand why I'm still hearing the stage ticking. I guess I'll mess with some low value resistors and see what happens.
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frequencycentral

Quote from: ugly_guitar_guy on June 14, 2011, 02:18:14 PM
Quote from: Mark Hammer on June 14, 2011, 02:14:14 PM
Any time you have a clock-like circuit, you are at risk for ticking.  Could be an LFO, could be a sequencer "stepper".  Same thing.

Well, the odd thing is that I have the sequencer set to inhibit and stay at stage 1 when it's switched off, so I don't understand why I'm still hearing the stage ticking. I guess I'll mess with some low value resistors and see what happens.

Inhibit stops the sequencer from sequencing. It doesn't stop the clock.
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tiges_ tendres

What kind of bypass are you using?  Maybe try grounded input style?
Try a little tenderness.

cloudscapes

Quote from: tiges_ tendres on June 14, 2011, 05:11:20 PM
What kind of bypass are you using?  Maybe try grounded input style?

I was just about to mention this. I think I've fixed a number of noise issues when bypassed like this.

make it so that for the 3 lugs (usually 2 are used, but 3 should be available) that take care of the bypass LED, the center switch lug is grounded, the effect active lug to the LED, and the effect output to the final remaining lug.

so that when the effect is engaged, the LED is grounded and lights up, but when bypassed, the effect's output is grounded.
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ugly_guitar_guy

Quote from: tiges_ tendres on June 14, 2011, 05:11:20 PM
What kind of bypass are you using?  Maybe try grounded input style?

Yup, I made sure to use grounded input style because I thought that would avoid this issue.
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R.G.

Are you using the ring terminal on the input jack to turn the power on when a plug is inserted?
R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.

ugly_guitar_guy

Quote from: R.G. on June 14, 2011, 07:31:00 PM
Are you using the ring terminal on the input jack to turn the power on when a plug is inserted?

No, it's always "on," just set to inhibit when the effect is bypassed.
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