Signal Tracer and Capacitor Tester (T1241E)

This mains powered two-in-one instrument was found in a Radio Craft from March 1948. The headphone must be high impedance.

AD Converter Circuit Test (CB16683E)
This circuit was found in Intersil's 1992 documentation consisting of a test for ADc0801 and...
Lamp control (CB21962E)
This 60's shield or driver employs germanium transistors. The circuit is from a 1960 Gernsback...
Transparent Octal Latch (CB15750E)
The circuit shown in the figure on the right can be used on a data transfer bus with the use of an...