Solar flashlight (CB20488E)

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

Bar or Moving Point LM3914 (CB17538E)
In the figure we have the way to use the LM3914 as a scale of bar LEDs or moving point. The...
3 Channel Transistor Mixer (CB1289E)
We found this circuit in a European publication of the 1980s. The transistor could be the BC549. The...
Continuity Tester (CB16894E)
We found this simple continuity tester in a 1995 documentation. It uses two LEDs to indicate...