LM4780 echo/reverb on one channel. Please help - diyAudio
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Old 5th November 2006, 01:07 PM   #1
Nordic is offline Nordic  South Africa
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Default LM4780 echo/reverb on one channel. Please help

Finaly got my LM4780 reference schematic boards installed in the case and connected to a PSU.

One channel plays fine, the other channel sounds like its comming through a tunnel and has quite a bit of reverby echoey sound artifacts...

Never encountered this error before so I am stumped as far as solveing the problem... gone over the PCB with the multimeter, and resistors seems to measure normaly etc...

Our telcoms copany dropped my dsl line a week ago, and it just went up 10 minutes ago again, so I have spend quite a bit of time on the ciruit allready.

Any help as to what the symptoms points to would be appreciated...
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Old 5th November 2006, 01:23 PM   #2
MaxS is offline MaxS  France
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Check your solders points, I've already experienced this problem with a bad solder.
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Ca marche pas ! Tu ne l' as pas branché non plus ....
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Old 6th November 2006, 09:27 AM   #3
Nordic is offline Nordic  South Africa
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Still, no better, checked it over again, all traces and components seem connected properly according to my multimeter.

Lol think I'll just stick 2 LM3875s in there, they sound much nicer anyway.
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Old 7th November 2006, 01:11 AM   #4
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If you ever discover what you did let us know because some people go to a lot of trouble to crate reverbs
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Old 8th November 2006, 06:33 PM   #5
Limhes is offline Limhes  Orkney Islands
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Indeed . I would say, sell it to a guitarist on eBay for some absurd amount; they will use everything that sounds reverberating, especially if it's unique and there's no way of telling where it comes from...
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Old 9th November 2006, 02:17 AM   #6
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OMG 1 of a kind mystery reverb. the only one in the world! also comes with an amplifier

don't you want to be the ONLY guitarist in the world with this amazing device!
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Old 9th November 2006, 06:19 AM   #7
Nordic is offline Nordic  South Africa
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Somewhere in the garage I have a tiny guitar training amp, that has those springs it uses for reverb.... realy ought to fix it up sometime..
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