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Steve, I am not sure you refer to my response about the SN 7407. But if so:
Find the manual of the SN 7407 on the internet. The drawing will tell you there are seven input/output pairs, pin one is input with pin two as complementing output. Etc.
Connect pin 14 with 5 Volts, pin 7 with ground...
Perhaps dropping in a bit late, but aren't you better off with a sn 7407? From your information I deduct that you have some switshing device, ie. a phototransistor that toggles between 0 and 5 Volts. And a receiving device, a PLC running at 24 Volts. Is that correct?
A 7407 is designed for this...
You could use a kitchen scale, any movement on top will generate some signal on the display(pins).
or perhaps the sensors from it. Like barry's answer, but with preinstalled matched straingauges.
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