We found this circuit in 1969 American documentation. FETs admit equivalents, as do transistors. The circuit can be used as a shield.
This circuit is intended to trigger an alarm when the input voltage exceeds one value and to...
This circuit, found in a 1986 documentation, uses an optical sensor to count pulses and, in its...
This circuit was found in Delco documentation from 1966. The components are from that time....