OK, I'm getting a bit frustrated here.
I just built a 5 knob compressor, a large beaver, and TWO 27V boosts. The compressor and the beaver work great.
Both times, I built the boost, and it worked great for about half an hour, and then had the same problem: A pulsing, heartbeat sound. The first build was a few months back, and I posted a thread about my struggles. So, when I built the second one and got it working last yesterday, I was very happy. And then when I played it today, just a heartbeat.
It works fine in bypass mode, and the LED comes on when I turn on the switch.
When the problem first happened today with the circuit engaged, I just got a clicking, pulsing sound, and no signal. I re-flowed the solder joints several times, and still had problems. Now, I have finally got the signal coming through, but it's like someone is turning the volume down to zero and then back up, and then back up and back down. It's an interesting effect, but most definitely not the way it's supposed to work.
I suspect it's my soldering skills, which I realize are far from expert. But I have re-flowed the joints several times, and I'm still having problems, so either I'm not re-flowing correctly or it's a different problem.
It strikes me as odd that I'm having exactly the same problem both times I built the pedal. Is there some chance that maybe I have a part in the wrong place/orientation?
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I'm posting pictures of both sides of the board.