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Post by angelodp on Mar 13, 2013 14:12:53 GMT -5
Hi, I am looking into adding, leds on a bigshot ABY. I want to keep it true bypass, as it is a passive pedal. I have seen some pics of an add on that uses a 9v battery and swapping the DPDT switches to 2 3DPT's and 3 LEDS. Wondering if any in community here have done this.
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Post by angelodp on Mar 14, 2013 0:37:02 GMT -5
I guess not. So... my plan is to de-solder the DPDT switch's and then swap in the 2- 3DPT's. Use the third rail to switch the leds. Am I ok running the resistor for the leds on the anode side? Value 2k-5k depending on the color? Oh... I will use short leads from the PCB board to the new switch's. I am not real clear on how to set up the power to the leds. I'll get a layout going so I can get some input.
Cheers A
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Post by ashcatlt on Mar 14, 2013 0:55:20 GMT -5
As long as the led, resistor, and switch are in series between the top and bottom of the battery (with the led "pointing" the right way) it doesn't make any difference what order they come.
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Post by angelodp on Mar 14, 2013 12:28:54 GMT -5
Ok great, thanks for the reply. Have you made an ABY pedal?
best A
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Post by ashcatlt on Mar 14, 2013 15:22:34 GMT -5
Nosir. I made a sort of A/B booster thing a while back, but not exactly what youre looking for.
Edit to add -
I don't think the led should need to share any connections with the audio part of the circuit. Specifically I don't think you need to ground the bottom of the battery or the led. In fact, in my mind it seems like isolating the led citcuit would have less chance of causing audible pops from sudden surges through the LED. I could well have it backwards, though.
If, after adding the LEDs, you end up with switching pops which were not previously there, you may need to add a capacitor to slow things down a little. In that case component order will matter. You'd probably want to go: battery + > resistor > switch > LED > battery - , and then put the cap from where the resistor meets the switch to the battery - so that the cap is NOT switched when the LED is. It might behoove you to wire it this way to begin just in case you end up needing to add the caps.
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