60's crystal radio (CB22171E)

Found in an English publication from the 1960s, this circuit uses period components, including the commercial grade coil.

Mini Telegraphic Oscillator (CB12879E)
This oscillator, from an old Argentine publication from 1973, uses the inductance of the 500 ohms...
18 W Bridge Amplifier (CB6990E)
Found in Popular Elecronics, this configuration also appears in this section, but obtained from other...
Fiber Optic Link (CB14351E)
The operational ones used in this project are old types from National Semiconductor, since the...