how i used analog signal 4-20ma as digital signal to energized a control relay?
I have one level transmitter installed on fuel tank and I want to convert the level transmitter signal (4-20ma) to dc volt (12vdc or 24vdc)to used this signal to energized control relay.
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Design a simple DC amplifier to convert current 20mA into 24 volts output. One simple power transistor stage with power source of 24 volts can do the job.