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RESISTOR TYPE FOR INDUCTIVE CIRCUIT

thread240-2158

RESISTOR TYPE FOR INDUCTIVE CIRCUIT

RESISTOR TYPE FOR INDUCTIVE CIRCUIT

(OP)
I HAVE HEARD THAT A WIRE WOUND RESISTOR IS BEST
FOR AN INDUCTIVE CIRCUIT.CARBON AND METAL FILM ARE NOT
PREFERRABLE. IS THIS TRUE AND WHY?

RE: RESISTOR TYPE FOR INDUCTIVE CIRCUIT

Hi,
I don't think it is true. In my opinion opposite of this comment can be true. I mean the wirewound resistor is the worst for a non inductive circuit because of its big parasitic inductance.(if you don't want to add some serial parasitic inductance to your circuit.)
I think the main advantage of wirewound resistors is, they can handle (or dissipate) more power than the others with less volume.  

Azmi Demirel
azzmi@elk.itu.edu.tr
Welcome
I am handsome but married :-)

RE: RESISTOR TYPE FOR INDUCTIVE CIRCUIT

Azmi is essentially correct. However, there are so-called "non-inductive" wirewound resistors in which the resistive wire element is given a bifilar construction. That tends to reduce the inductance the resistor would otherwise have, although not eliminate it altogether.

John Dunn
Ambertec, Inc.

RE: RESISTOR TYPE FOR INDUCTIVE CIRCUIT

Hi,
John, would you compare non-inductive wirewound resistors with the other types (metal or carbon film resistors and even water resistors). Is the bifilar construction the best (by mean of parasitic inductance)?

Azmi Demirel
azzmi@elk.itu.edu.tr
Welcome
I am handsome but married :-)

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