This is a typical 80's FM radio mixer circuit. The circuit was found in a documentation of the time.
May 2017 - Mouser Electronics already has in stock with the new ADP244x switched regulators from...
The small transmitter shown in the figure can generate signals in the range of 50 MHz to 200 MHz....
This circuit uses a photo-transistor to trigger a circuit sourcing a square signal for the output. The...