Using a BA1404 integrated circuit this small FM stereo transmitter was found in a Radio Electronics magazine from October 1989. The coils are indicated.
This class B push-pull amplifier circuit with a few hundred milliwatts of power was found in an...
In the figure we have a window detector that uses only a voltage comparator. The circuit can use...
This circuit was found in an old American documentation. The operational used is of the...