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A sparkly hot pink box stood upright, seen face on. 5 finks is hand-lettered in purple down the left edge. An indicator LED and a small toggle sit at the top, four chrome knobs in two rows of two below them, a fifth chrome knob with a second toggle beside it, cv lettered underneath and one small jack at the bottom.

Opto Wobble · two 555s and an LFO · One of a kind

5 Finks

Synth Available · 1 of 1

My Opto Wobble, boxed. Two 555s that play each other through an LED and a photocell, and an LFO on the same board that wobbles one of them or the other, picked with a toggle. Five knobs, a CV jack on the face, in a sparkly pink 125B with the name lettered down the side.

  • TypeNoise synthesizer, an Opto Duet with an LFO wobbling it
  • ControlsFive knobs, two toggles, an indicator LED and a CV jack on the face, the other jacks on the top edge
  • CircuitMy Opto Wobble layout: the Opto Duet and the Dual-Wave LFO on one board
  • Enclosure125B
  • Weight~8 oz
  • Power9V DC
  • BuiltSeptember 2026
  • StatusAvailable - one of a kind
$80 free shipping Buy with Card Email to Buy

What it does

The Opto Wobble is two of my layouts on one board: the Opto Duet, a pair of 555s wired through an LED and a photocell so one oscillator's output becomes the other's timing resistor, and the Dual-Wave LFO. The LFO goes through a toggle onto pin 5 of either 555, so it bends one voice or the other, and a CV jack lets something outside do the bending instead.

The fifth knob is the starve. It sits in the supply and takes the voltage down, and the board gets glitchy in a way I like.

The layout is free on this site and it is built as drawn, so you can see exactly what is in the box before you buy it.

One of a kind. When it is gone it is gone.

Demo

Demo video coming soon.

Controls

Five knobs
The Opto Wobble's five: tempo and pitch for the duet, rate and blend for the LFO, and a starve knob that takes the supply down and makes the whole thing glitch. I am not going to say which knob is which on the face; turn them and you will hear it.
The wobble toggle
Sends the LFO to one 555 or the other, or nowhere in the middle.
CV
A jack on the face into the first 555, so something else can do the wobbling.

Circuit: my Opto Wobble layout, free on this site. Built, painted, and finished by Onion Madder as an original one-off - not affiliated with, endorsed by, or a clone of any commercial brand.