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Hm, that would have been too easy I suppose 🙁 No, it’s not that, TP1 and 2 are not shorted 🙁
Could the LDR be defective?Here’s a little sound sample of what it sounds like:
http://www.falckenberg.com/downloads/Trem.mp3Wow, that was quick 🙂 Thanks for your speedy response 🙂
Do you mean that maybe light from the other LEDs might be interfering with the optocouplers? I would have thought once the box is fully closed, it should be pretty dark in there.
I had poked these minute holes in there after I realised the problem, and poking them in didn’t have any detrimental effect. They are really minute anyway, so I can barely see the light inside them. Maybe I should take them out and redo them with a fresh piece of shrink tubing.
If it’s not that, what else could it be?I’ve also noticed that there’s no trem effect whatsoever if I turn the Mix knob all the way to Hi. The signal only gets quieter and maybe a bit muffled. If I turn it all the way to low, the lower frequencies do trem, the high frequencies remain steady. That’s the same in both phase settings. So that seems to me that something on the treble side isn’t quite right.
Again, both optocouplers seem to work, they both emit a pulsating light through those tiny holes. Covering them up doesn’t seem to make a difference.In Calibration mode thanks to my tiny holes I’m observing that the low LED flashes and goes dark when I turn the mix to “hi”, the other way round the hi LED is constantly on and doesn’t change when I turn the knob to “lo”. Somehow the high frequ. part isn’t affected by the effect… Band solder joint somewhere? If so, any obvious places to look for it?
Very mysterious! I hope my description makes sense to you.
Thanks for now, let’s hope it’s something really simple and obvious 🙂
