New here. Purchased a few of the Mad Labs Jr Theremin kits. I’ve put 4 together and all have the same issues. Thinking there is a component issue or an issue with the PIC chip. The issue is when powered on, it does a self test which all of mine pass. It then starts beeping 2 tones every 10 to 15 seconds. Tons of folks out there are having the same issues with the new kits. I was wondering if anyone has had the same issues I’m having and did you solve it.
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Hey i have the same problème
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Just put one of these kits together.
It works but occasionally beeps twice and flashes the four LEDs.
It might do it 3 times within 15 seconds or go several minutes without doing it.
I see nobody is responding to this thread but I just wanted to add my name to those with issues.
After some tinkering the problem changed to having the four LEDs rapidly and constantly going off whilst the theremin part still worked and it was still resetting itself randomly.
After replacing half the components and testing after each one it turned out to be a faulty NE555 chip.
Hope that helps someone else.