Found in old documentation, this circuit uses a double gate MOSFET. The operating frequencies depend on the coil, and the indicator is a microammeter.
This circuit can be used as a shield for microcontrollers. The relay is power compliant, and the...
This Texas Instruments integrated circuit, available from Mouser Electronics, has a 91 dB common...
We found this circuit in a Radio Electronics of the 90s. The integrated circuit used is not common...