Solar flashlight (CB20488E)

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

20 W BTL amplifier TDA2005M (CB15237E)
The operating voltage of this circuit is 18 V, and the source current is 3.5 A. The circuit is...
Pulse Generator with Variable Cycle LM139 (CB14233E)
This circuit was suggested by National Semiconductor in its Linear Applications Handbook. The...
Constant Light (CB15552E)
The basic idea of the circuit shown in the figure is to increase the brightness of an ordinary...