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Old 16th February 2003, 03:32 AM   #1
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Question Panasonic power resistor query

I'm hoping someone out there with a great memory or the right docs can help me. I have a large number of panasonic power resistors, part # ERF-10EJR68L, but no specs beyond their nominal value and wattage, (0.68ohms, 10w). Searching on the web did not reveal anything useful. They seem like reasonable devices, but I have no idea how they are constructed, ie wirewound versus metal film etc. They are rectangular, approx 2cm by 3cm,, perhaps 4mm deep, packaged in a white, ceramic cell. I have not yet whacked one to examine it's guts, but it may come down to that.

Thanks for any help

Stuart
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Old 16th February 2003, 03:53 AM   #2
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They are wirewound 5% or 10%.
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Old 16th February 2003, 04:18 AM   #3
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Question Any more info?

Audiofreak, thanks for your help, do you happen to have a more comprehensive source for the rest of the specs? The tolerance though important is not critical as I plan on matching them in a bridge to get very tight tolerances. I was more wondering on whether they are 10w in free air or if there is an assumption about mounting. Plus I guess I'd sort of like to know what their intrinsic inductance is etc.

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Old 16th February 2003, 04:21 AM   #4
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I believe that they are 10W in free air but I cant provide any more info than that sorry.
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Old 17th February 2003, 02:36 AM   #5
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I have cracked open flat ceramic emitter resistors.
The resistive element waz a flat zig-zag piece of resistance alloy, presumably to eliminate inductance.

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Old 17th February 2003, 04:26 AM   #6
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Question Another question...

Anyone know about the issues with inductance in wirewound resistors? I can imagine there are many situations where a micro-henry or two would be a problem, but most audio amps use an inductor in the output to provide more weird load stability, so it seems unlikely this is a big problem in a degeneration resistor. Another issue I can perhaps believe in is with mutual inductive coupling between adjacent resistors, especially given the relatively high currents in the output stage. Presumably this problem, if it exists can be fixed by proper physical arrangement...

Your thoughts gentlemen

Stuart
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