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.

0 to 15 V x 3A power supply (CB18808E)
This power supply also has a fine adjustment feature. The transformer is 16 + 16 V with 3 A and...
Light Alarm (CB10330E)
This circuit was obtained in a 1985s English magazine. The circuit can still be assembled with...
Band Pass Filter (CB13079E)
The circuit shown in the figure is suggested by Texas Instruments in its Linear Circuits...