Abyss lfo not working

M

ManicStrat2112

New member
I just built the abyss and the led surrounded by the ldr's isn't working. I'm getting no led pulse at all. The status led is not working either. I'm getting guitar signal that is amplified by the level control, so the effect is getting power. Also, when I move my hand over the ldr's I get the phase vibe pulse sound, so the effect is working. It seems to just be the led driver part of the circuit and the other controls that isn't working. Anyone have any ideas on what going on or where to start looking?
Also, on the board, what does "sw" stand for on the offboard wiring?
Thanks
 
Sort by date Sort by votes
Thanks. Turned out I had them both right, but the status led was bad, I soldered another one (I decided to use a 5mm red instead of 3mm) and it works fine. The LFO led was right too but It keeps burning out. I've replaced it twice and it burned out after 30 seconds to a minute both times. Any ideas why it would be burning out?
 
Upvote 0 Downvote
ManicStrat2112 said:
Thanks. Turned out I had them both right, but the status led was bad, I soldered another one (I decided to use a 5mm red instead of 3mm) and it works fine. The LFO led was right too but It keeps burning out. I've replaced it twice and it burned out after 30 seconds to a minute both times. Any ideas why it would be burning out?
Click to expand...
Did you use correct VOICE pot B10K?
 
Upvote 0 Downvote
Did you sub any parts?

Are you running this on 9V?

Personally, I think R26 is too small and the LED is overstressed when VOICE and INTENSITY are dimed. I'd make R26 470 Ohms and see if your LED lives longer. You shouldn't need anywhere near that much brightness to make this pedal work. Where did you get your LDRs? Post some photos of your board, that might shed some light ;)
 
Upvote 0 Downvote
I want to add that this solved my problem as well

I was having an issue where when the rate, intensity/depth, and voice controls were centered, the pedal would operate correctly (although with a square wave like behavior to the LED, esp at higher rates), but if you dimed the intensity but brought the rate to zero the LED would stop oscillating.

The only way to get it to resume oscillation is to dime the voice, then the rate, and then bring it back down, but the only time the wave form was truly correct is while the LED was ramping down from the high rate to the medium rate.

Also, with the voice knob dimed, the LED would not dim all the way to off, rather the voice knob increased the brightness, but also increased the lower shelf of the brightness. So the bulb was getting too much current.

It's weird and hard to describe. Anyway, replacing the R26 100R with a 470R seems to have fixed it! Thank you!!!
 
Upvote 0 Downvote
You must log in or register to reply here.
Back
Top