The resistors R1 and R2 consist of 8 220 ohms x 2 W resistors connected in parallel. The dissipation must be higher for high transmitter power. The indicator can be the multimeter.
This circuit is from a Popular Electronics from the 90's. It can be implemented with equivalent...
This two-transistor preamplifier was found in a 1960 Sylvania transistor manual. The output...
The gated oscillator shown here turns on when a “1" Iogic Ievel is applied to the input. The...