This simple voltage-controlled oscillator generates signals from 300 Hz to 1,500 Hz with voltages from 1 to -5 V at the input. The circuit was found in a 90s Popular Electronics. It can be used as a shield.

This simple voltage-controlled oscillator generates signals from 300 Hz to 1,500 Hz with voltages from 1 to -5 V at the input. The circuit was found in a 90s Popular Electronics. It can be used as a shield.