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 didactic circuit makes the sequential activation from 0 to 10 to demonstrate the functioning of a...
This power source was found in an old Argentine publication from 1973. The transistor could be the...
This circuit operates at a voltage of 1.3 V from a single mercury cell. We found in an old...