60's crystal radio (CB22171E)

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

Modulated Light Receiver (CB14690E)
This circuit, which can be used on an optical link, is suggested by the Texas Instruments...
10 A power supply (CB17206E)
This source, from a 1998 publication, can be used as a battery charger. The diodes are for 10 A x...
Circuit To Observe Transistor´s Characteristic Curve (CB1287E)
We found this circuit in an old publication on oscilloscopes. Its purpose is to observe the Ie /...