The 1: 1 transformer on this circuit found in a 1967 Electronics World can be wrapped around a small ferrite rod. The circuit operates with 600 to 6 000 Hz control signals.
This circuit published in the November 1964 Radio Electronics magazine powers a light bulb but can...
This circuit uses an old National Semiconductor operational amplifier, but it can be implemented with...
This circuit is from the 1990 Motorola Linear Databook. The circuit can be applied to other...