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Tried to build a KoT, ended up with a dual oscillator

Started by cloudprofessor, September 21, 2017, 06:44:42 AM

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cloudprofessor

So for the past three months I've been meticulously building a King of Tone with an 18v charge pump inside from the tagboard layouts. I'm doing a build with separate i/o for each side, but they're tied to the same

Tonight I put the first board in and was met with a loud drone where the you can somewhat control the pitch with the drive knob. Flipping one of the clipping switches gives it a different pitch range. I figured it was something with the wiring or maybe with that specific board so I put the next one in thinking it would work but I got the exact same issue.

Anyways, I feel like I've double and triple checked everything and I have no idea what the issue could be. My charge pump is giving 18v out, the board seems fine no solder bridges, and as far as I can tell my wiring is good.

Anyone here might know what specifically might be causing this, or at least where to start looking? I'm going to check the IC with a multi-meter tomorrow, and maybe ok around with the oscilloscope as well.

Side note, it actually sounds kinda cool. I put it through my LS-2 as a mixer/sum pedal and was playing around with the individual oscillations, harmonizing them together.

I can post pics tomorrow.

Luke51411

Could be a charge pump issue. Which one did you use?

cloudprofessor

This NE555 one from tagboard: http://tagboardeffects.blogspot.ca/2013/02/ne555-voltage-doubler.html

Just because I happened to have a bunch of ne555s on hand. I've built a few of the same ones for a ROG Supreaux Deux build I did previously and had them work just fine. Also I checked with the multimeter and it's giving me about 18.23 volts. Both boards are tied to the one charge pump though, even though they have different ins and outs.

cloudprofessor

So I tried taking the charge pump out, still getting the drone sound. I tried playing around by removing some of the grounds and it did some weird stuff but didn't fix anything overall.

If anyone wants to hear what it sounds like: https://www.instagram.com/p/BZUHTPuFIsv/?taken-by=geoff_lg

alanp

Which PCB are you using for KoT? There are quite a few PCBs out for it, by now.
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cloudprofessor

Tagboard layouts: http://tagboardeffects.blogspot.ca/2012/10/analogman-king-of-tone.html

I think I figured it out though. Upon going through the board piece by piece I found I didn't put one of the 100uf caps in the right place. I fixed it and I get crunchy guitar noise through it, though the knobs are still acting weird so I've still got some work to do.