This circuit was obtained from an 80's EDN. The components used are still common. The circuit can be used as a shield and the frequency is approximately 775 Hz.
Suggested by Sprague in the 90's documentation, this circuit applies to AC motors. The...
The diodes in this circuit are used for waveform correction. The circuit is from Electronics Now...
This 5.1 MHz oscillator was found in a 1980s American documentation. The used operational...