Close the switch at the top left (above the 5v battery) to begin. Vary the blue voltage input (upper leftish part of circuit) to vary the frequency of the circuit. Toggle the center SPDT switch to select between Triangle-Square or Sawtooth-Pulsed, and the right most SPDT to select between Square/Pulsed or Triangle/Sawtooth! Kind of confusing, just try toggling the switches randomly!
