ADD_ON_SCOPE_MULTIPLEXER

Published:2009/7/9 2:01:00 Author:May | From:SeekIC

The operation of the unit revolves around three ICs: a 4093 quad NAND Schmitt trigger, a 4066 quad analog switch, and a 7555 timer. When a high is fed to probe 1 in, it is inverted to IC1a and once again by IClb, so that the input to IC2a is high. That high causes the stoitch contacts in IC2a to close. With the contacts closed, a high-level output is presented to the input of IC2b. The high output is fed to probe 2 in.That signal is then inverted by ICld and routed to IC2d, causing its contacts to open, and the unit to output a logic-level high. The output of IC2d is then fed to IC2c.



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