This circuit was found in an Electronics World of 1968. The transistor can be any general purpose and the double T must be set to R3 for the desired effect.
This audio circuit has an output power of 1 W. We found it in the Radio Electronics magazine of...
September 2016 - It can be obtained from Mouser Electronics the new voltage regulators (LDOs) to...
This circuit is suggested by National Semiconductor in its Linear Applications Handbook. The...