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 simple NiCad battery charger was found in an English documentation. Resistors R2 and R3...
This was a very popular instrument in the workshops of the 60s and 70s. It was a "top of the line"...
We found this circuit in a 1981 publication, when it was still possible to find 22.5 V batteries (used...