Le Truc

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Le Truc is a small noise-box with three knobs, a push-button and a switch. One of the knobs dials in the frequency of the two relaxation oscillators, while the other detunes these two against each other – the third knob is a volume control. Because the two relaxation oscillators run into a XOR-Ringmod this changes the Timbre and produces funny noises.

The device runs on a single 9V battery and outputs it's signal on a 6.3mm audio jack, but could also be powered by a Eurorack Modular.

For Wiring look no further than here:

Errata (revision 0.9)

There is a mistake with the output power switching in revision 0.9 – gladly this is easily fixed, by drilling away a pad and bridging a connection:

The footprint of the hexinverter chip had the in- and outputs of the right side swapped. Fix: using some resistor legs like this: