[sdiy] Carbon composition... vs carbon film resistors..

[Paul Anderson]

In fairness, even a straight wire will have some inductance. When current flows it sets up a magnetic field around the conductor, it's physics. 

Inductive reactance being given by 2*pi*f*L, we have 6.28*0.0000233 times our frequency. So I figure at 20kHz that's 2.93 ohms of reactance. Impedance is the sum of DC resistance, capacitive reactance, and inductive reactance. In the situation of the resistor, the inductive reactance is very small compared to the DC resistance element. 

Be mindful of wirewound resistors, they will have greater inductance. 

Sent from my iPhone

On 2013-02-12, at 1:24 AM, cheater cheater <cheater00 at gmail.com> wrote:

> What type resistor is it? Notice the article shows that the various
> film resistors are fairly spirals. I'd expect inductance.
> 
> Cheers,
> D.
> 
> On Mon, Feb 11, 2013 at 5:44 PM, Barry Klein <barryklein at cox.net> wrote:
>> I am repairing a Minelab metal detector coil and came across a 511 ohm
>> (damping) resistor across the RX coil of a DD coil.  I measured it with my
>> LC102 for inductance and got 233uH.  I tried one from my parts bin and got
>> the same.  Is this real or a measurement artifact of the meter?  I'm going
>> to test a carbon comp for comparison.
>> 
>> Barry
>> 
>> 
>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl
>> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Jean-Pierre
>> Desrochers
>> Sent: Monday, February 11, 2013 05:37
>> To: synth-diy at dropmix.xs4all.nl
>> Subject: [sdiy] Carbon composition... vs carbon film resistors..
>> 
>> Reading the following info about resistor types :
>> http://www.electronics-tutorials.ws/resistor/res_1.html
>> 
>> Can I conclude that 5% -> carbon film <- type resistors like these :
>> http://www.yageo.com/documents/recent/Leaded-R_CFR_2011.pdf
>> 
>> will show the same results as the following 5% -> carbon composition <- type
>> :
>> http://www.seielect.com/catalog/SEI-RC.pdf
>> 
>> in an audio circuit ?
>> 
>> JP
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