This is the receiver for the previous circuit found in the November 1991 Radio Electronics magazine. The frequency is 2.2 MHz determined by the coils.
This circuit was suggested by Motorola in a 1980s publication. It is based on a PUT that is not a...
The amount of light emitted by na LED is given by the intensity of the current flowing across it....
Found in Ferranti's 1968 documentation, this circuit uses a Darlington photo transistor to drive a...