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which rating resistor to put before a 4v, 3.3ohms 1.2a stepper motor to prevent any damage to the motor? Answered


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Re-design
Re-design

11 years ago

If you use 4 volts then you don't need anything.

What is your power supply voltage?

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crispycat
crispycat

Answer 11 years ago

the voltage will be 12v
im using the easy cnc driver circuit
https://www.instructables.com/id/Easy-to-build-CNC-Mill-Stepper-Motor-and-Driver-ci/
i want to replace the lightbulb with a resistor as i cant seem to get the bulb rating right and not too keen on being blinded and burning myself on hot bulbs :)
unfortunately im new to electronics .. so good at following guides but clueless at trying to alter things myself 

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steveastrouk
steveastrouk

Answer 11 years ago

No, you can burn yourself on hot resistors instead..its inevitable. You need a (12-4)/1.2 Ohm resistor on each winding.

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Re-design
Re-design

Answer 11 years ago

THen you need to get a voltage regulator and use that to reduce it down to 4 volts.  Radio shack has a variable regulator that you can just dial in 4 volts with just a few parts.

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lemonie
lemonie

11 years ago

What are you powering it from, and do you actually have what you need to control a stepper-motor?

L

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steveastrouk
steveastrouk

11 years ago

Well you CAN do it like that, except you don't get decent speed out of it.

Steve