This circuit generates pulses whose frequency depends on C1. The circuit can be powered by voltages from 5 to 15 V. We find this configuration in a Signetics manual.
This well-designed sinusoidal oscillator by Wien bridge was found in ancient European...
This is a circuit for testing small lamps and LEDs. The lamps that can be tested are the ones...
Found in a Popular Electronics from the 90's, this circuit can be implemented with almost any...