Solar flashlight (CB20488E)

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

200 mA LDO - Ultra Low Noise (CB15565E)
The circuit shown in the figure consists of a 200mA low voltage drop (LDO) regulator using the...
10V Reference Source (CB21529E)
This circuit was found in an American documentation from the 60's. The transistors are from the...
Unijunction timer (CB22086E)
Found in old documentation, this timer uses a sensitive relay and a 2N2646. The time is given by...