Solar flashlight (CB20488E)

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

Optical Communicator – Receiver (CB25536E)
This is the receiver for the previous circuit we found in the December 1992 Radio Electronics...
Photodiode Amplifier (CB14156E)
We found this configuration with CMOS-compatible output in the 1994 National Semiconductor Linear...
Recording tapes eraser oscillator (CB7303E)
This 70 kHz oscillator is used to erase tapes in pre-recording. The circuit is from 1968 General...