This circuit has a 2 V full scale using a 4-and-a-half-digit A / D converter. The circuit is powered by a voltage of 9 V. We found this configuration in the 1983 Intersil Databook.
This shield circuit uses a common CMOS port. The voltage depends on the interfaced logic. The...
This circuit was published in Popular Electronics from the 90's. The components are common, as...
This circuit with SCR was found in an old documentation. The SCR can be the TIC106, and the...