Solar flashlight (CB20488E)

This circuit charges a battery to power a flashlight at night. The circuit is from an English publication from 1991.

Remote Control Extender (CB26151E)
This circuit appeared in the 1991 Electronics Experimenter Handbook. The circuit is for remote...
Power control (CB23586E)
This circuit was found in Radio Electronics magazine from January 1959. The power transistor must...
Atmospheric noise monitor (CB21066E)
This circuit uses an MW radio tuned to around 540 kHz to detect atmospheric signals, for example, from...