This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the PNPN planar key at the time. The circuit has two supply voltages.
This independently charged circuit was found in a 1969 EEE. The operational amplifier supports a...
This high current regulator for TTL circuits was found in an old French documentation from the...
This indicator was found in a 1974 publication, but it can be fitted with the BC548 transistor or...