This circuit is from a 1972 Motorola publication. The used transistor can still be found, but it can be used equivalent. The circuit is powered by the amplifier with which it must operate.
The indicated circuit uses an unusual buffer from National Semiconductor. The frequency is given by...
This circuit was found in specialized microwave documentation from the 1960s. The circuit makes use...
We found this portable transmitter that reaches up to 200 meters in a Japanese publication from...