Analog IO Protection


Posted on Feb 7, 2014

The I/O Filter Wildcard provides a convenient place for prototyping analog circuitry or for filtering, conditioning or protecting the I/O lines of other Wildcards. Twenty-four I/O lines can be independently filtered, or their signals can be combined in custom ways. When connecting external signals for data acquisition, you should always filter yo


Analog IO Protection
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ur input and output lines; this will provide the best reliability and longevity for your instrumentation. Two 24-pin connectors are used for input and output; one generally mates to the field connector of a Wildcard I/O module, while the other connects to your external signals. A third connector accommodates the Wildcard Bus, which can be used for power and ground. Up to four through-hole and four surface-mount components can be soldered onto the board to filter each of the 24 I/O lines. The I/O Filter Wildcard is a nearly blank prototyping board with a sea of holes for mounting components and three 24-pin headers. The headers/connectors are used as follows: The Wildcard Bus connector is a 24-pin stacking/go through header/socket that allows the I/O Filter Wildcard to stack on other Wildcards. You can use the power and ground signals on it to power your custom circuitry or to provide signal references. The Wildcard Field (output) connector is a 24-pin header that you can cable to any other Wildcard Field header. The side of the Wildcard where H3 resides is usually called the front of the Wildcard. The greyed-out pins on the Wildcard bus, H1, would not usually be used; only those shown in bold, the power and ground connections, would generally be needed. If you are filtering inputs to a Wildcard, for each of the 24 I/O lines, you generally apply a signal to H2, the I/O (Input) Connector, you mount custom circuitry on the...




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