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convert 24vdc to 10 vdc?
Is it possible to take a 24vdc power source and reduce the voltage down to 10vdc? I have a 0-10vdc analog input card for a PLC with a potentiometer for a variable 0-10vdc input. I want to avoid buying a 10vdc power supply and use the 24vdc one I have in my panel. I think it is possible with a resistor in series with the POT but I must be using ohms law wrong.
Well, since you are just inputting a signal to a probably relatively high (and relatively constant) impedance ADC input the inefficiency of a resistor voltage divider is not too important. If you put a fixed resistor with 1.4 times the resistance of the "pot" in series with it, it should work pretty well but noise may be an issue, depending on what sort of other loads are being supplied by your 24V supply. You might want to look into a zeneer regulator, as that may work better, but you asked about resistors, and resistors could be used .
For example, assuming the input impedance of your ADC is so high we can ignore it (probably not really true, but maybe close enough) if you have a 10k pot in series with a 14k fixed resistor, the current will be 24V/24000Ohms = 1mA: 1mA * 10ohms = 10V.
You'd want to put the fixed resistor between the +24V and one end of the pot, and take the output signal from the slider of the pot, with the common of the 24V supply and the ADC common connected together.
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200 20K Potentiometer Pots Panel Taper Dual StepB20K US $156.00
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