Phase 1: Schematic Analysis

The Atari Punk Console (APC) is a stepped-tone generator. It basically uses one timer in astable mode to trigger a second timer in monostable mode.

System Warning: Be careful with the capacitor polarity. Reversing them will result in component failure.

Here is the code I used for the Arduino sequencer that drives it:

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
}
// Loop logic