Low Frequency Oscillator

Features

  • Selectable Triangle or Sine outputs (+/- 5v with Level control)
  • Pulse output (0-5v) with PWM control and LED's indicating duty cycle
  • Frequency control adjusts frequency exponentially from about 0.1hz to 100 hz
  • Notes

    I didn't think it was necessary to temperature compensate this circuit. If you want to temperate compensate, use a Q81 type +3300ppm/deg C tempco resistor for R4.

    The values for R11 and R12 were obtained experimentally on a breadboard. You may want to use a trimpot instead.