This circuit was found in the February 1997 Electronics Now magazine. The circuit has a power supply for the NE602 and free inputs and outputs for projects.
The diagram below is an application of the Texas Instruments TPS25221 to an ISM controlled power...
The OC30 power transistor is an old type of germanium from the 60s. This amplifier, using this...
This circuit was found in a 1973s Japanese publication. The power transistors used are of the era...