Some General Amp Qs |
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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Posted: 11 June 2010 at 2:27am |
"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.
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djk
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Speaker Sol
Young Croc Joined: 15 September 2009 Location: Ireland Status: Offline Points: 1320 |
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AvLee
Young Croc Joined: 01 June 2010 Status: Offline Points: 1196 |
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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! |
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Speaker Sol
Young Croc Joined: 15 September 2009 Location: Ireland Status: Offline Points: 1320 |
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Caps discharge suddenly on power off, meaning they can no longer hold charge for more than a few mS?
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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"only one does this."
Caps are shot. "other frequencies than 50hz?" True RMS voltmeter. |
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djk
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Speaker Sol
Young Croc Joined: 15 September 2009 Location: Ireland Status: Offline Points: 1320 |
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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
Edited by Speaker Sol - 05 June 2010 at 11:27am |
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pfly
Old Croc Joined: 25 October 2007 Location: Helsinki, Fin Status: Offline Points: 2828 |
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what kind of meter should be used to measure output voltage with other frequencies than 50hz?
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Louder than loud
Old Croc Joined: 13 May 2010 Location: Guildford Status: Offline Points: 2377 |
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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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Speaker Sol
Young Croc Joined: 15 September 2009 Location: Ireland Status: Offline Points: 1320 |
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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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abbotsmike
Registered User Joined: 28 December 2009 Location: Hillingdon, UK Status: Offline Points: 343 |
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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.
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Speaker Sol
Young Croc Joined: 15 September 2009 Location: Ireland Status: Offline Points: 1320 |
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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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Symzzi
Registered User Joined: 23 May 2006 Location: United Kingdom Status: Offline Points: 245 |
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Multimeter + probes + eyes |
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