This circuit was obtained from Motorola documentation from 1969. The setting applies to other operating systems, including lower supply voltages. The zener determines the output signal.
This 60's shield or driver employs germanium transistors. The circuit is from a 1960 Gernsback...
The given number circuit is used to activate the relay by interrupting the light beam that hits...
This circuit from a Japanese publication in 1968 uses germanium transistors from the time like the...