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Old 20th January 2007, 08:42 PM   #1
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Default Crackling at high volume

I've built one channel of a Gainclone (LM3886). At medium-high volume, the sound starts to crackle at a definate point, below which is fine. I tried putting a zobel network (100 nf and 10 ohms) across the output and it seemed to reduce the noise, but it can still be heard.
What else can be done to help?
Many thanks.
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Old 20th January 2007, 08:49 PM   #2
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How about cooling? Maybe it's the protection circuits that you trigger?
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Old 21st January 2007, 02:32 AM   #3
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Gain clowns sound very bad when they clip. It is very possible that you are clipping the amp.
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Old 21st January 2007, 08:10 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
give us some constuction/compatability details.

Transformer VA & Vac
Dual or single bridge
Smoothing uF
Inverting or non-inverting
Speaker impedance & sensitivity
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Old 21st January 2007, 08:20 AM   #5
Nordic is offline Nordic  South Africa
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How big is your heatsink?
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Old 21st January 2007, 10:10 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi Mat,
have you fitted a heatsink, or have you gone quiet while you are fitting one now?

Let's hear from you.
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Old 21st January 2007, 10:27 AM   #7
Nordic is offline Nordic  South Africa
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I think we killed another one, Andrew.
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Old 21st January 2007, 10:41 AM   #8
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Sorry, been asleap.
Yeah, I have a large heatsink fitted to the chip. 4 x 2 inches. It gets slightly warm to the touch, so I don't think the chip is overheating.
The transformer is 160 va, and the power rails are +- ~38v. The caps are 5600 uf, and the amp is non-inverting. The speaker inpeedence is 8 ohms.
Many thanks.
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Old 21st January 2007, 10:56 AM   #9
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What is the speaker efficiency? Your speakers how many db with
1 watt@ 1 meter?
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Old 21st January 2007, 11:07 AM   #10
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I don't know. How can I find that out? It's not on the speaker anywhere.
Many thanks.
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