Volume expander amplifier (T364E)

This circuit was found in the 1961 RCA tube manual. The circuit includes a power supply stage.

Infrared Remote Control Transmitter (CB17347E)
This single channel circuit can be used with one of the many receivers that we describe in this...
Rain Alarm (CB6267E)
We find this circuit in an old documentation, but it can be made using modern transistors. The circuit...
SCR Visual alarm (CB24128E)
This circuit, with printed circuit board, is from an article in Radio Electronics magazine from...