Using a BA1404 integrated circuit this small FM stereo transmitter was found in a Radio Electronics magazine from October 1989. The coils are indicated.
Found in a 1963 documentation, this circuit employs germanium transistors of the time. Transformer and...
In the figure we have a way of receiving ultrasonic signals of a single frequency using a PLL 567....
This traditional circuit generates a 200 Hz sinusoidal signal. The frequency depends on the...