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.
Found in American documentation from the 1980s, this circuit can be designed with equivalent...
Found in an American paper from the 90's, this circuit can be adjusted to pass frequencies above 30 to 300...
With a mains-rated transformer and 1:1 winding this benchtop circuit was found in the January 1995...