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Some General Amp Qs

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Speaker Sol View Drop Down
Young Croc
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    Posted: 02 June 2010 at 9:33pm
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.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Symzzi Quote  Post ReplyReply Direct Link To This Post Posted: 02 June 2010 at 9:37pm
Originally posted by Speaker Sol Speaker Sol wrote:

How do you check for DC on the output?


Multimeter + probes + eyes
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Speaker Sol Quote  Post ReplyReply Direct Link To This Post Posted: 02 June 2010 at 9:43pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote abbotsmike Quote  Post ReplyReply Direct Link To This Post 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.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Speaker Sol Quote  Post ReplyReply Direct Link To This Post Posted: 02 June 2010 at 10:14pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Louder than loud Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2010 at 3:41am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote pfly Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2010 at 7:06am
what kind of meter should be used to measure output voltage with other frequencies than 50hz?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Speaker Sol Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2010 at 11:26am
Originally posted by Louder than loud Louder than loud wrote:

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. 

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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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2010 at 11:57am
"only one does this."

Caps are shot.

"other frequencies than 50hz?"

True RMS voltmeter.
djk
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Speaker Sol Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2010 at 1:13pm
Caps discharge suddenly on power off, meaning they can no longer hold charge for more than a few mS?


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Post Options Post Options   Thanks (0) Thanks(0)   Quote AvLee Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2010 at 11:12pm
Originally posted by Speaker Sol Speaker Sol wrote:

Thanks.

So any one have any ideas about the "pop" noise that accompanies certain old amps, when they are switched off? 


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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Speaker Sol Quote  Post ReplyReply Direct Link To This Post Posted: 07 June 2010 at 11:23pm
Wink

Thanks
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