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29th May 2006, 03:13 PM
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#1 |
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diyAudio Member
Join Date: Aug 2005
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LM4780 (3 channels not working)
new problem:
Some of the channels are not producing sound and I even got an arc on the board at one point. The chips are all warming up as they should, but no sound. My boards appear to be a "little messy" so I was thinking that maybe a signal input is grounding somewhere. Would that cause a lack of output? Dominick
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A real amateur enthusiast! |
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29th May 2006, 03:42 PM
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#2 |
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diyAudio Member
Join Date: Apr 2005
Location: Belfort
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3 channels ? But the LM4780 only has 2 channels (2*LM3886 in one package)
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29th May 2006, 04:14 PM
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#3 |
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diyAudio Member
Join Date: Aug 2005
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I am running 4 LM4780 chips each wired in parallel. They all have there own power supply.
Dominick
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30th May 2006, 03:47 AM
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#4 |
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diyAudio Member
Join Date: Aug 2005
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Its all working now-Thanks to everyone for your knowledge!
Dominick
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30th May 2006, 03:27 PM
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#5 |
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diyAudio Member
Join Date: Apr 2005
Location: Belfort
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Hope you will have fun with those chips ! I have 2 of them running bridged on 8ohms speakers, and 2 of them paralleled to power two 4ohms subwoofers
Did you put snubbers on the PSU ? It really works to refine highs ! |
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30th May 2006, 04:25 PM
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#6 |
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diyAudio Member
Join Date: Aug 2005
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I have all of the components for a snubber but did not include it due to space restraints inside the amp itself.
But that is funny that you say it refines the highs because Peter Daniel reccomended to me that I only use the snubbers on the subs of my bi-amped speakers!?? He said that it would cause irregularites in the signal curve at higher frequencies that might be unfavorable. Any comment? Dominick
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