ADC Analog Read Value 0~5V to 5~20mA Current-Loop Transmitter Converter

Description The board convert common 0~5V analog value to 5~20mA current-loop, it enable the value transfer as long as possible without lost. Read more about current loop advantages on wiki here. Board Features: ADC analog value input from two pin screw cable terminal Board power supply and current output from the three pin screw cable tterminal On board power indicator LED, and current indicator LED (strength) On board three pin header: 0V, ADC and 5V. The 5V power supply is generated by the board. On board power regulator 7805 allows the input voltage up to 30V. Tuning methods: Setup: Connect ADC input to 0V or 5V by a jumper, connect a current meter to read on the output, connect power supply. Set for miniumium input 0V = 5mA: Connect 0V and ADC , so input ADC value is 0V.  Then tune the “zero” potentiometer until the output is read to 5mA Set for maximium input 5V = 20mA: Connect 5V and ADC , so input ADC value is 5V.  Then tune the “range” potentiometer until the output is read to 20mA