We found this transistorized circuit in a 1985 documentation. The circuit can operate with voltages from 9 to 12 V and the adjustment of the operating point or input sensitivity is done in P1.
The transistor can be a BC548 and the coil has the following characteristics for 1 MHz. L1 has 80...
This circuit is from the National Semiconductor's Linear Application Handbook of 1994. The same...
This circuit, with a few meters of range, can function as a wireless microphone or transmitter for media with...