60's crystal radio (CB22171E)

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

CMOS Amplifier +1 and -1 Gain (CB15751E)
The interesting circuit shown in the figure, can have its gain digitally controlled and present two...
Speed Alarm (CB3988E)
We found this circuit in an old Mullard (Philips) documentation. The sensor consists of a...
On and Off with SCR (CB25060E)
This is a circuit with two switches, one turns on and the other turns off for DC loads using SCR....