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Chip Amps Amplifiers based on integrated circuits

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Old 23rd March 2011, 07:57 AM   #1
Koos is offline Koos  South Africa
diyAudio Member
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
Join Date: Jul 2004
Location: Scottish Borders
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.
regards Andrew T.
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