1940s commercial receiver (T1618E)

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

Lie detector (CB7005E)
This simple lie detector was found in Popular Electronics. Transistors are commonly used. The...
Voltage to Frequency Converter (CB494)
This circuit, using a unijunction transistor (UJT), converts a voltage applied to the input in a...
BQ25872 Switched Battery Charger
August 2017 - Texas Instruments' new integrated circuit BQ25872, a 7-A keyed battery charger with...