Question about M-Audio Audio Buddy Amplifier
After a brought the preamp, I noticed that from the second output I receive not only the good signal from the microphone, but also a bad signal of about -70dB: a radio channel. I would prefer noise instead of radio, because it's more tolerable. Although I catch a radio channel in my apartment with it, when I changed the preamp location, going to the warranty service, there the engineers couldn't hear any radio, so that they could not fix my preamp, because in their opinion it worked perfectly. What can I do?
I would use sheilded wire on the mic with the least amount of cable. You can relocate the pre amp with aluminum foil wrapped around the pre amp. also turn the gain on the mic down as to eliminate any interference from your strong radio station nearby. Randy
Posted on Mar 13, 2007
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Posted on Jan 02, 2017
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It is possible that while you cleaned the top with a damp cloth , some drops of water could have fallen on the board and shorted. If so it is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.
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