This circuit works as both an injector and a signal follower. We found it in the May 1994 issue of Electronics Now. The Z1 headphone must be high impedance.
This circuit lights up with any input polarity, being used to light a railway composition with the...
This circuit was found in 80's documentation from Analog Devices. The formulas for calculating the components...
This flasher for incandescent lamps was found in Radio Electronics from the 80's. The circuit uses...