This circuit with 117 V output was found in a 1969 Electronic Design. Drive transistors admit equivalents and information about transformers is not given.
This amplifier was obtained in an Electronics Now based on the LM1875. The circuit must be powered...
This circuit provides 2.5 W of power with 6 V supply and 4-ohm speaker. We found it in the Radio...
Based on the Linear Technology LTC2054, this -48 V circuit was found in a 2005 manual. The circuit is...