Luis Guzman

Abyss

Earthquaker Devices The Depths Clone - June 2020

This is a build of the Pedal PCB Abyss Univibe. The circuit is a clone of Earthquaker Devices' The Depths. Univibe is a form of modulation, similar to a chorus effect, but it is unique in that it is optically controlled. Inside of the pedal enclosure there is a pulsing LED surrounded by four light-dependent resistors (LDRs), and these LDRs control the modulation effect. The result is a throbbing, underwater-like effect that is shown in this demo.

The Circuit

Photos

Components

Resistors:

1 x 100
2 x 3K3
2 x 4K7
3 x 10K
1 x 15K
1 x 22K
8 x 47K
1 x 56K
3 x 100K
2 x 220K
2 x 1M
1 x 2M2

Capacitors:

1 x 100pF
1 x 470pF
1 x 4.7nF
1 x 15nF
1 x 100nF
1 x 220nF
5 x 1uF
1 x 10uF
2 x 47uF
1 x 100uF

Semiconductors

1 x 1N5817
2 x MPSA18
1 x TL072
1 x TL074
4 x 5mm Radial LDR (KE-10720)
1 x 5mm Yellow LED
1 x 3mm Red LED

Potentiometers

1 x B10K
2 x B25K
1 x A100K
1 x B100K Dual-Ganged