Hadouken

A Zener diode breakdown noise generator with an arcade game button.

S&H In, S&H Trig, S&H Out

S&H In 8, S&H Trig 9, and S&H Out 10 are a set of sample-and-hold circuits. S&H In 8 carries the signal to be sampled; S&H Trig 9 receives the trig that samples the input at S&H In 8. The held result stays until the next trig triggers a new sample, and the result appears at S&H Out 10. When S&H In 8 is not patched, the trig at S&H Trig 9 samples Noise Out 2, producing a nearly random held value. The sample-and-hold can also be triggered by pressing button 5 when S&H Trig 9 is not patched.

Noise Trig & Noise Out

Noise Trig 1 and Noise Out 2 belong to the noise generator, which continuously outputs noise without any input—the sound of Zener breakdown, amplified many times over. If a cable is inserted into Noise Trig, the Zener diode leaves the breakdown state. Feeding a signal into Noise Trig (trig, square wave, or anything else) that is higher than 3.3 V drives the diode back into breakdown, cycling on and off and changing the character of Noise Out.

Offset Out

Knob 3 sets the output voltage at Offset Out 4 while button 5 is held. Offset Out 4 follows the knob; releasing the button ends the output.

Aux In & Aux Out

Aux In 6 and Aux Out 7 are a VCA pair with a simple envelope triggered by button 5 (not tunable). Aux In 6 accepts audio or other signals. Pressing button 5 sends the Aux In signal to Aux Out 7 under envelope control. When Aux In 6 is unpatched, Noise Out 2 is normalled to Aux In 6, so you can shape the noise at Aux Out 7 directly with button 5.