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Old 23rd March 2011, 07:57 AM   #1
Koos is offline Koos  South Africa
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Join Date: Mar 2011
Angry LM3886T

I have a Behringer GMX212 V-Tone guitar amp which uses a 2 x LM3886T power amp (stereo). There is no output on either of the chips. I eventually replaced both chips. There is still no output. I cannot find a circuit diagram for the Behringer amp so I searched for LM3886T application ccts. I injected a signal at pin 10 (input) but get nothing at pin 3 (output). No components measures strange. Supply voltage is -36v, 0v, +36v. Anybody that can help? What function will pin 8 (mute) have in this application?
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Old 23rd March 2011, 09:58 AM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Hi,
with mute pin inactive the power amp will not amplify.

You must sink current from the mute pin to turn on the amplifier. Datasheet shows how much.
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