One transister topband transmitter

BFY51-transmitter-circuit

Back in the 70s, I remember my friend Richard G4EIE building a one-transistor transmitter for 160m. It comprised a BFY51 transistor, crystal, L-C tuned circuit, a resistor, a couple more capacitors and a carbon microphone. It put out 250mW AM or 750mW CW and was surprisingly effective! I’ve wanted to build this circuit ever since … Read more