116132737470303854

Published: Wed 25 February 2026
Updated: Wed 25 February 2026
By me

In misc.

Beep

Photo of a pcb standing upright. Only a small part have been populated with through-hole components. On the right is an amp circuit, a led to indicate when power is on, a 9v battery, a speaker and a pin from two components hidine underside, a switch and a power converter. On the top left is a circuit built around a 555 timer and a led and in the bottom left a momentary switch to power the noise making circuit. There are 19 circuit and switch unpopulated. In the end, it will make a poly555, a polyphonique analogique synthetizer

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