Abyss - vibrato disappears

tinkertoneworks

New member
Hey all
This question has been asked before, but it seems like it's happening in a slightly different way?

The Abyss sounds great and exactly like I would expect it to, but at very slow speed and/or high intensity settings the vibrato will completely go away, even though the sound is clearly being effected by the preamp/eq. It will come back once intensity is backed off a little bit and when speed is turned all the way up to kinda "kickstart" the LED, then you can adjust it to a slower speed and it will usually stay if it isn't set too slow.

(to clarify high intensity at high speed is usually okay? It's mostly high intensity at low speed or just low speeds in general. The voice knob seems to have the least impact when all the way down)

This isn't a matter of bad solder joints or unseated IC/transistors or the back of the pots making contact with the solder joints, after asking someone and observing the LED while this happens it almost seems like there's a problem with how the LED is being driven

I'm aware taking the back off will impact how the LDRs detect light, but it almost seems like at these settings the variation in light is too subtle for the LDRs to detect that anything is changing. Someone suggested covering the LDR/LED arrangement with a small square of cardboard lined with tinfoil, but I'm wondering if there's any other solution I could be missing. It's an amazing sounding univibe and it went well for my first optical or modulation pedal build, but having the full sweep of controls is important to me if I want to build more complicated circuits.

Thank you 💜
 
Back
Top