chknpicker wrote:
Ah, good to know about the LED being part of the circuit. I will try replacing it and see what happens.
If you look at the BFT schematic, you'll see in the lower left that the LED is part of the speed control portion of the circuit. Since the C19 cap blocks any DC flow between that section and the rest of the effect circuit, the only voltage source for the speed control circuit is what comes through that LED. I don't understand the workings of the BFT circuit well enough to know if the failure of that LED would render the entire effect circuit mute or just disable the speed modulation control (I suspect it's the latter). But if it's blown, it needs to be replaced in any case.
chknpicker wrote:
I have some random LEDs laying around. Not sure about the rating on them other than a larger LED that says 9-12 V. Is that OK just to try, or maybe a 1N4007 diode, just to test?
If you have any
5mm LED's or the smaller
3mm LED's on hand, you can use either of those. I wouldn't bother with anything else.
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