July 13, 2009
about 4 years ago
It seems I’ve solved the popping problem. After trying 2 or 3 power supplies I ended up building it myself. One 12 V AC transformer, one rectifier bridge, one electrolytic capacitor (I took 2200 uF, but 1000 will be enough too) and one LM7812 regulator. That’s it, as simple as possible and all the popping sound went away. My guess is that the key part here is the 12V regulator.
Yes, I have this problem too. I tried different power supplies and with one of them I managed to eliminate the problem. All others, including a 9V battery, give this popping sound. Earlier user “mct75” mentioned the same thing, but I don’t think it’s just power supply. After all, what can be cleaner than fresh 9V battery? Also I noticed that placing a finger on some chip pins eliminate this sound, when I remove the finger, it stays silent for a couple of seconds, then the sound starts again.
Any feedback is highly appreciated.
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