Solar flashlight (CB20488E)

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

4 Transistor Stereo Amplifier (CB18848E)
This circuit is from an old Japanese magazine from 1960. The circuit uses germanium transistors from the...
TDA2006 8 W amplifier (CB15085E)
This is the factory setting (National Semiconductor) of the TDA2006 as an audio amplifier. The...
Motorcycle Timed Alarm (CB16869E)
This circuit can use a pendulum sensor. We found this configuration in a 1994 publication. The...