Originally suitable for photography applications, this circuit from a Popular Electronics from the 90s can also be used to time plate baths. The components are common, and the sensor is remote.
This circuit has more sensitivity than the previous one (CB4114E) for using a full-wave detector...
The Texas Instruments TPA3100D2 integrated circuit (www.ti.com) consists of an efficient class D...
This sensor circuit from a 1967 Ferranti documentation uses components from the era. The circuit...