We found this small FM transmitter in an Australian publication from 1991. The 3-transistor circuit has a range on the order of 400 meters.
This low-power, low-supply voltage amplifier uses a preamplifier to achieve a high-gain...
In the figure we have a line receiver circuit (twisted pair) with the possibility of...
This simple circuit can be used as audio output stage for intercoms, experimental radios and other low...