Solid state relay (CB8518E)

This circuit was found in a 90s Popular Electronics. Both the coupler and the MOSFET can be of any type.

5V x 1A Power supply 7805 (CB19301E)
This is the traditional configuration of a 5 V supply with the 7805 for a current of 1 A. The...
Short-wave receiver (CB9149E)
This several short-wave bands receiver, according to the chosen values of the components, was found in...
Stereo decoder (CB10044E)
In the figure we have a stereo decoder from the 70's with pilot lamp for signal indication. The...