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19th August 2002, 06:21 PM
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#1 |
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diyAudio Member
Join Date: Jul 2002
Location: Denmark - Jutland
 
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Dummy - load
Hi all,
What sort of dummyload is best for testing amps ? I have a ohmic load that can be used for amps up to 200 W (both 4 and 8 ohm). But is it enough to just use an ohmic load, or do I need to add a capacitor or inductor ? What do you all use when testing ? How about modelling a speaker with crossover, how is that done ? thanks \Jens |
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19th August 2002, 08:36 PM
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#2 |
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The one and only
Join Date: Mar 2001
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More Gratuitous Haiku:
On bench, dummy loads For best subjective results try loaded dummies 
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19th August 2002, 08:41 PM
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#3 |
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diyAudio Member
Join Date: Jul 2002
Location: Denmark - Jutland
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Thanks Mr. Pass
He he funny, but on a serius note what do you use ? \Jens |
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19th August 2002, 09:01 PM
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#4 |
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The one and only
Join Date: Mar 2001
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Those big 250 watt Dales that you've seen, mounted
on old Threshold sinks. |
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19th August 2002, 10:59 PM
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#5 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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That's my dummy load.
__________________
www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC |
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19th August 2002, 11:09 PM
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#6 |
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diyAudio Member
Join Date: Jun 2002
Location: Europe, Slovenia
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I make my own resistors (4 resistors, 2x8ohm and 2x4ohm) for dummyload.. I used cekas wire (this wire is used in big electric cookers, i get it when we went in factory that makes them with school..), one resistor can handle some kW I guess.
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20th August 2002, 01:12 AM
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#7 |
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diyAudio Member
Join Date: Oct 2000
Location: Argentina
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You can always dump the resistor(s) on a bucket of water... not nice, but it works like a charm
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20th August 2002, 06:03 AM
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#8 |
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diyAudio Member
Join Date: Jul 2002
Location: Denmark - Jutland
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So all of you just use an ohmic load.
I guess mine is fine then \Jens |
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24th August 2002, 08:51 AM
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#9 |
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diyAudio Member
Join Date: Nov 2001
Location: Harlowton, MT, USA
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You can put your resistor(s) in parallel with a 2uF capacitor for a better test. Just be warned that some amps won't like it.
__________________
- "With power amplifiers, negative feedback is a good thing, and positive feedback can induce destructive oscillation, but with people, positive feedback is a good thing, and negative feedback can induce destructive oscillation" |
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24th August 2002, 09:06 AM
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#10 |
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diyAudio Member
Join Date: Jul 2002
Location: Denmark - Jutland
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Loads of fun
Hi Kilowatt
Well, I heard from a fellow dane to put 1 µF parallel over the resistors. Haven't tried it yet, but I'll post the results (I hope that nothing will be burned) Thanks \Jens |
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