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 oscillator, which can be used as a signal injector, was found in a Popular Electronics from the 90s....
An old analog TV that is not in use can be turned into an oscilloscope for low frequencies...
The purpose of this circuit, which we find in an old American documentation, is to allow the...