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High-accuracy 4-20 ma current-loop transmitter
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4-20ma output from arduino
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Lm324: 1-5v to 4-20ma voltage to current conversion
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Raspberry pi analog output 4-20ma current loop transmitterBasics of the 4 Xtr111: 0~3.3v to 4~20maLoop powered 4-20ma wiring.

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实用:pwm转4-20ma电路(智能仪表上的电路) (amobbs 阿莫电子论坛)看到有人发过pwm转4~20ma电路,我也发个我的,已经在产品使用,非常稳定 (amobbs.com 阿莫电子论坛) Pwm-controlled 4-20ma transmitter is galvanically isolatedDigital potentiometer with op amp.

Loop powered pwm to 4-20ma isolated signal converters input: 10hz-99hz
20ma pwm signal mikrocontroller erstellen .
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