Opto Duet through an Analog Bit Crusher · One of a kind
The Beepulator
My Opto Duet, two 555s that play each other through an LED and a photocell, with its pots running through my Analog Bit Crusher board and a switch to put the crusher in or take it out. Three knobs, two toggles, a CV in and a line out, in a purple 125B with the name lettered on by hand.
- TypeNoise synthesizer, two boards in one box
- ControlsThree knobs, two toggles, an indicator LED, a CV in and a line out
- CircuitMy Opto Duet layout, with its pots running through my Analog Bit Crusher board
- Enclosure125B
- Weight~8 oz
- Power9V DC
- BuiltSeptember 2026
- StatusAvailable - one of a kind
What it does
Two of my own boards in one box. The Opto Duet is a pair of 555s wired through an LED and a photocell shrink-wrapped nose to nose, so one oscillator's output becomes the other's timing resistor and they chase each other. The Analog Bit Crusher is a sample-and-hold with its own clock.
On this box the duet's pots run through the crusher board, and a switch on the face puts the crusher in or takes it out, so the same knobs play two different instruments depending on where that switch sits.
Both layouts are free on this site, 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
- Three knobs
- The Opto Duet and the crusher between them. I am not going to draw a tidy map: on this box the duet's pots run through the crusher board, so what one knob does depends on where the others sit and whether the crusher is in.
- The crusher switch
- Puts the Analog Bit Crusher board in the path or takes it out.
- CV and line out
- Along the bottom edge beside the power jack: a CV in, lettered on the face, and the line out.
Circuit: my own stripboard layouts, 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.