Found ina 1970 American documentation this fast-reading circuit uses a photodiode. Transistors support modern equivalents. The circuit can be used as a shield.
This circuit, found in a 1978 publication, converts 5 V into a symmetrical 15 V output under low...
This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the...
ECL logic circuits can operate at very high frequencies. This circuit was obtained from a 1977...