Wattmeter (T1351E)

This circuit is from a February 1949 Radio Electronics magazine. The circuit uses 3 tubes and includes the power supply.

Multiplexed AD Converter (CB9023E)
This 8-channel converter was found in a 1970s American documentation. The integrated circuits used are...
Sound Effects Generator (CB17012E)
This circuit is from a 1995 documentation. Several CMOS integrated circuits are used to produce...
Automatic lamp control (CB6847E)
Found in Radio Electronics, this circuit is intended to activate the lighting system of garages...