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Thanks guys.. interesting solution and I take the comment of using the LM339 onboard however the circuit is looking more complicated than I would like with Vcc requirements of the comparator being 36Vdc (or +/ - 18Vdc) and so a simple solution could be a bulky box than I would like with PP9's...
Hi
I am currently testing 4-20mA Analogue output cards of PLC’s to an LED/Resistor circuit. As you can imagine, this is simple but can be sometimes difficult to determine by the brightness of the LED for 4mA and 20mA.
Therefore I am looking for a simple trip amp solution that when a PLC output...
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