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Video Blog #029 - Alesis 3630 Compressor Repair

DISCLAIMER: This video is educational only, so if you decide to do the same yourself then you are on your own, I can't be held responsible for any problems/issues/damage/injury that may occur if you decide to follow this blog and try it yourself.


This Alesis 3630 Compressor sits below my Tv in the house between the satellite receiver and my audio amplifier, but it developed a fault. In this video I analyse the problem, effect a repair and do some other work to the unit.

Alesis 3630 Website -

Replacement op-amp - LME49740NA -

Replacement VCA - THAT2180CL08-U -

The power supply circuit appears to look like this (quick sketch), it consists of a voltage doubler which enables the 9Vac input to provide more than enough DC voltage for the 7815 and 7915 regulators: