This circuit was found in a Popular Electronics from the 90s. The transistors are general purpose, and the gain depends on the ratio between R2 and R1.
In the figure we have the way to make the three-phase control of a motor using opto-diacs. The circuit is...
This circuit was obtained in a 90s Popular Electronics. It is used for tuning on AM radios. The...
We found this circuit in the May 1972 issue of Radio Electronics magazine. Its purpose is to teach...