This simple circuit with bipolar transistors is from a 1970s American documentation. The RF transistor can be a BF494 and other general purpose transistors. The circuit uses a low current lamp as indicator. The coil depends on the operating range.
This simple circuit with bipolar transistors is from a 1970s American documentation. The RF transistor can be a BF494 and other general purpose transistors. The circuit uses a low current lamp as indicator. The coil depends on the operating range.