This circuit was obtained in a Hobbyst Handbook from 1990. The circuit can be easily assembled since the SCR can be a TIC106 and the transistor a 2N30555.
Using SCRs, this circuit from a 1967 General Electric manual allows full wave load control with SCRs....
This simple photometer was found in a 1977 Radio Shack manual. The sensor is a photocell, which can...
This circuit is from a documentation from the 70s, but it can be assembled with a TIP32 transistor in an...