Slave flash (CB8700E)

This circuit was found in a Popular Electronics from the 90s. It uses a LASCR which is a photo-SCR not common today.

Solar panel linear power source (CB21023E)
The circuit is from an Electronics Hobbyst Handbook from the 90s, being valid for panels of the...
Sawtooth generator (CB8884E)
This circuit can generate signals from 80 to 800 Hz with an amplitude of 0.3 V. We find it in a...
Class A power amplifier (CB22236E)
This circuit is from an American publication from the 60's. The power is on the order of 600 mW....