Solar flashlight (CB20488E)

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

1 to 4 MHz CMOS Oscillator (CB5132E)
This circuit appears elsewhere on this site. The CMOS gate can be any one, including NAND and NOR...
Horticulture lenses from LEDIL
LEDIL provides through Mouser Electronics a series of lenses for use in greenhouse horticulture....
Beep For Flasher (CB4340E)
This circuit adds a beep to turn on with car flashers that do not have this feature. A 47 ohm to...