With the indicated components, this circuit oscillates around 3.6 kHz. The components can be changed. The circuit is from a 70s American documentation. Operational equivalents can be tested. The original operational amplifier is an audio amplifier

With the indicated components, this circuit oscillates around 3.6 kHz. The components can be changed. The circuit is from a 70s American documentation. Operational equivalents can be tested. The original operational amplifier is an audio amplifier