100 mA regulator (CB21168E)

This 2-terminal regulator was obtained from a 1990s National Semiconductor manual. The components admit modern equivalents.

MW Transmitter (CB18454E)
This small AM transmitter was found in a Japanese publication from the 1960s. The coil has 20 + 80...
Transistor radio (CB22539E)
This simple 2-transistor radio is from Radio Electronics in October 1952. The circuit outputs a...
Wireless CW Monitor (CB4179E)
Placed near a telegraphic transmitter (CW) and with a small antenna or pickup, it reproduces the...