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 generates a pulsed tone whose frequency depends on C2 and whose flashing depends on...
This circuit of a Popular Electronics from the 80's selects tones around 60 Hz, acting as a filter...
This circuit samples the current in a load and in case of excessive value it activates a...