This 100 kHz oscillator was found in a 1966 Motorola publication. The transistors are of types suitable for the generated frequency and L1 / C1 depend on that frequency.
White noise applied to an audio amplifier can be used as a relaxant, since it resembles the noise...
This circuit fires a xenon lamp being powered by a 300 V battery. The circuit is from a Radio...
The operational amplifier of this circuit is not very common today, because we removed the circuit...