MUFFIN FANS: CONVERTING A THREE PIN TO A TWO PIN
A typical 3 pin muffin fan has three colors…
red, black and yellow…
red is positive
black is negative
yellow is speed or sensor
A two pin has two pins just red and black.
Now lets say that the connectors are different and you want to use the two pin connector…
Clip of the cable connecting th two pin connector so you have cable to spare.
If you clip of the yellow… and sodder or twist together the red and black to the corresponding red and black of your two pin connector then your fan should run full speed. Just make sure the red isn’t dangling where it can short something out by touching it.
Remember keep Voltage and Current the same and you should be ok… if the fans voltage is beyond the spec of the previous fan then it will pull too much current. If the fans current is too high the same thing will happen.
If for some reason you are diying this and you have a fan thats rated too high a voltage its probably going to pull too high a current. I either diy a bench power supply or buy athen your next step is to figure out the power rating of the fan and of the supplied power. Find a variable resistor (potentiometer) thats power rated atleast twice that.
Now here is where it gets interesting… if the fan pulls too much power it can burnout or shorten the life of components…
so lets go through some ideas…
if the fan pulls too much voltage but the right current then calculations are with resistor in series.
if fan pulls too much current then calculations are with resistor in parallel.
if fan pulls too much voltage and current… then fix the voltage first and then fix the current using the ideas above.
To do any of these conversions, its best to use a breadboard to diagram the circuit and a bench power supply to power it… resistors, pots and ofcourse the fan.
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