October 2013
Intermediate to advanced
312 pages
12h 10m
English
Content preview from The Maplin Electronic Circuits Handbook, 2nd Edition
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INPUT CONDITIONING 187
load using a solid-state relay. Such devices are internally optically coupled
and provide a very high degree of isolation between the port and the load.
The D2W202F from International Rectifier has a typical input resistance
of 1.5 kQ and will thus interface directly with most TTL devices and Port
Β output lines. Controlled voltages can range from 60 V to 280 V a.c. at
currents of up to 2 A. Maximum 'off state leakage current is 5 mA and
the device provides an isolation of up to 2.5 kV.
Input conditioning
The input signals required by microcomputer control systems are un-
fortunately rarely TTL compatible. Hence, in th ...
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