1940s commercial receiver (T1618E)

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

Sequential Upand Down (CB4579E)
This circuit uses components that are still common despite being from 1995 documentation. The circuit can...
Ripple filter (CB6734E)
This filter was found in Delco's 1965 documentation. It can be implemented with modern components...
Temperature sensor shield (CB5093E)
This circuit was found in an old publication and can be adapted for use with modern...