Are emi filter coils set up for use on 'that' specific circuit or can I take an emi coil and use it on another circuit and still have it reducing noise and working as it should ?
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Re: Emi filter coils
They are general use coils. You do want to use a bigger coil if you're using it on a circuit that draws bigger power than the original power supply, because otherwise it would heat up and burn.
Other than that they can be successfully applied to anything.Originally posted by PeteS in CARemember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
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Re: Emi filter coils
Yes. An EMI coil is in series with the power supply so it needs to pass all the current that the supply is drawing from the line. It's current (amps) applied to resistance (ohms) which causes power (watts). Now, in this case this power is doing nothing useful, so it is wasted power, and produces heat. Given the size of an average EMI coil, the losses should never be greater than 2-3W for the coil to stay at an acceptable temperature. You can use this calculator. Btw, most of those coils have low enough resistance that they cannot be measured with a regular multimeter. Even so, when you're drawing 4A or upwards from the line, even that low resistance becomes important. 4A, even over 0.1 ohms is already 1.6W.
Of course, a 3W resistor is smaller than an EMI coil, but a resistor is designed to run at high temperature, while the coil isn't.Last edited by Th3_uN1Qu3; 04-05-2011, 04:21 PM.Originally posted by PeteS in CARemember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
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Re: Emi filter coils
Originally posted by Gabriel View PostAre emi filter coils set up for use on 'that' specific circuit or can I take an emi coil and use it on another circuit and still have it reducing noise and working as it should ?
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