Solar flashlight (CB20488E)

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

Driver for AD Network (CB20162E)
This circuit is a driver for R-2R network of AD converters. We found it in manufacturer...
Locking Oscillator (CB22261E)
This circuit was found in an American publication from the 60's. The transistor is made of...
Astable Audio Oscillator (CB11993E)
This circuit produces an audio tone on the speaker or magnetic capsule. Rx must be such that added...