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An upright glossy purple box photographed face on. Two clear lights sit side by side at the top, two black push buttons below them, and a large clear knob with a numbered skirt in the middle. Under the knob are two toggles with cv lettered between them over a small jack, and the popo is hand-lettered across the bottom in pink and purple.

Siren + Police Lights · Purple 125B · One of a kind

The Popo

Synth Available · 1 of 1

My Siren and my Police Lights in one purple 125B. The Siren is a 555 cop-car siren, and it literally sounds like a police siren. The Police Lights flash the two lights at the top back and forth. There is a CV jack on the face too.

  • TypeTwo of my circuits in one box: a 555 cop-car siren and a 555 police-light flasher
  • ControlsA large clear knob, two push buttons and two toggles, a CV jack, and two lights at the top
  • CircuitMy Siren and Police Lights stripboard boards, both built and checked on their own first, in one box
  • Enclosure125B, purple, the popo lettered in pink and purple
  • Weight~8 oz
  • Power9V DC, center-negative barrel jack
  • BuiltOctober 2026
  • StatusAvailable - one of a kind
$80 free shipping Buy with Card Email to Buy

What it does

Both boards are layouts I give away on this site, and I built each one on its own before boxing them up: the Siren and the Police Lights. Each runs on a 555 timer. The Siren sweeps its pitch up and down like a cop car, and the Police Lights flash two LEDs back and forth like a light bar.

Demo

Demo video coming soon.

Controls

The knob, the buttons and the toggles
They work the siren and the lights. Push, flip and turn: it is a siren, you will hear it.
cv
A control voltage input, lettered on the face above its jack.

Circuit: my own Siren layout, free on this site, with my Police Lights board beside it. Built, painted, and finished by Onion Madder as an original one-off - not affiliated with, endorsed by, or a clone of any commercial brand.