Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load. The response ranges from 20 to 20 000 Hz. No information is given about the transformer used.
This circuit uses a photocell as sensor and a sensitive relay according the power supply voltage....
This 2005 circuit from a Linear Technology manual makes use of the LTC610HV and an optical coupler that...
The 4093 or any other NAND gate can be used for the very sensitive configuration of a R-S...