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HELP - VOLTAGE TO CURRENT

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alec_t I tried the simulation, implemented and tried the circuit with the valve. Everything went on well. I'll continue working with that. I still don't know what's wrong with the other circuit but I'll also try KeepItSimpleStupid 's general comments.
 
it's not very common for a device on a 4-20mA current loop to actually use the current as it's power source. usually, the current in the loop is providing a control signal, and the device is triggered by the signal.
 
I'll try doing what @KeepItSimpleStupid 's general comments say.
KISS's suggested weak pull-down on the FET gate is certainly worth including.
 
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