Some General Amp Qs
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Category: General
Forum Name: Amp Forum
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URL: https://forum.speakerplans.com/forum_posts.asp?TID=39758
Printed Date: 19 April 2024 at 2:58am
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Topic: Some General Amp Qs
Posted By: Speaker Sol
Subject: Some General Amp Qs
Date Posted: 02 June 2010 at 9:33pm
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Hello, couple questions on my mind. Testing amp output, I have a fair idea, but would like to be told before I go messing. How do you check for DC on the output? Also, Over the years I have come across a few amps that, "pop" when you turn them off. What courses this? Thanks. |
Replies:
Posted By: Symzzi
Date Posted: 02 June 2010 at 9:37pm
Multimeter + probes + eyes |
Speaker Sol wrote:Posted By: Speaker Sol
Date Posted: 02 June 2010 at 9:43pm
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Probs across the out put, looking for DC voltage. Thanks thats what I thought, but thought I better check before I go probing. If I run an a sine wave through the amp and turn the multimeter to AC, I Should be able to read output voltage?
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Posted By: abbotsmike
Date Posted: 02 June 2010 at 9:50pm
| dependent on the multimeter. if it's a 50hz sine wave, then I believe any meter designed for standard supplies will do the trick and give a rough reading. |
Posted By: Speaker Sol
Date Posted: 02 June 2010 at 10:14pm
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Thanks. So any one have any ideas about the "pop" noise that accompanies certain old amps, when they are switched off?
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Posted By: Louder than loud
Date Posted: 05 June 2010 at 3:41am
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That would be due to no ''soft start'' which is something all all new amps now have / come with. Hope that's helps and if it doesn't have a look around google.
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Posted By: pfly
Date Posted: 05 June 2010 at 7:06am
| what kind of meter should be used to measure output voltage with other frequencies than 50hz? |
Posted By: Speaker Sol
Date Posted: 05 June 2010 at 11:26am
Thanks, I don't think it is a soft start issue, a friend has a pair of amps, only one does this. But you are right, I will google it. Thanks
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Posted By: _djk_
Date Posted: 05 June 2010 at 11:57am
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"only one does this." Caps are shot. "other frequencies than 50hz?" True RMS voltmeter. ------------- djk |
Posted By: Speaker Sol
Date Posted: 05 June 2010 at 1:13pm
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Caps discharge suddenly on power off, meaning they can no longer hold charge for more than a few mS? |
Posted By: AvLee
Date Posted: 07 June 2010 at 11:12pm
You'll find a lot of speaker management systems/processors do this as well so don't forgot the, "last on, first off sequence" for the amps when your switching all your gear on and off! |
Posted By: Speaker Sol
Date Posted: 07 June 2010 at 11:23pm
Thanks
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Posted By: _djk_
Date Posted: 11 June 2010 at 2:27am
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"Caps discharge suddenly on power off, meaning they can no longer hold charge for more than a few mS?"
Caps can age at different rates. One may hold a charge after the others have bled off, and a 'pop' may be the result.
Auto power sequencing can help with system turn-on/turn-off noises. It can be really bad if your amps come up before the processing settles down, like with an intermittent power cord. ------------- djk |