Vertical bars are 20dBV, or a factor of ten. The first peak, at 150Hz is our sine wave, and the second peak is down in voltage by about a factor of 100. It’s not lab equipment, but it’s pretty ...

Part 1 shows how to make an oscillator with a pitch that is proportional to a control voltage. Part 2 shows how to modify the circuit for use with higher supply voltages, implement it using discrete ...