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 VCO circuit was obtained in the 1972 RCA linear circuits manual. The integrated comparator is CMOS and...
I found this circuit in a 1992 Electronics Experimenter Handbook. The circuit can be easily...
This audio amplifier circuit is from Ibrape's technical documentation from the 70's. The BC177 can be...