5-tube commercial radio (T1619E)

This commercial superheterodyne receiver was found in a 1949 Radio Electronics. The circuit uses battery.

4-Channel Remote Control Transmitter (CB18604E)
The circuit presented is quite simple, employing tone modulation of the signal. To receive the...
Potentiometer remote control (CB8029E)
This circuit was obtained in a 1967 Raytheon manual. The company's component is an optical coupler with...
Linear thermometer (CB9359E)
This circuit was obtained in an Electronic Engineering of the 90s. The operational amplifiers and...