6SN7 Preamplifier (T1105E)

This preamp circuit has a typical configuration as found in a 1946 publication. Supply voltages are indicated.

Capacitive Code Switch (CB10446E)
This circuit was obtained from a Radio & Electronics Constructor from March 1976. The magazine no...
Precision Full Wave Rectifier LM741 (CB25220E)
This buffered version of the previous circuit appeared in an article in the September 1989 Radio...
Darlington Stage with Feedback (CB975E)
This circuit was found in a 1968’s publication and uses germanium transistors. Equivalents can be...