1940s commercial receiver (T1618E)

This receiver was found in a Radio Electronics from 1949. It is a superheterodyne of the time using 6 tubes.

Signal Injector with 555 (CB25532E)
This application of the 555 was found in the November 1992 Radio Electronics magazine. The...
Solar power source (CB20481E)
In the figure we have a solar power source for experiments with this type of energy. The cells must...
10 LED 0 to 1 V Scale U237B and U247B (CB25440E)
This linear bargraph circuit was found in the February 1992 issue of Radio Electronics magazine. The 10...