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jandr49 7th April 2011 09:19 PM

Help with Symasym
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Hi - I've built a 6 channel symasym for use with a ESP LR4 crossover - worked well and sounded very nice until I tried scoping the left channel outputs of the crossover, at which point for a reason that I do not understand I melted R2 (10 ohm signal ground to power ground) on all three left channel amps - have replaced the resistors and the amps now appears to work perfectly apart from the fact that I have just recieved a shock from the signal input ground and can measure 74v from power -ve and chassis ground and 37v from signal ground and chassis ground - these measurments are all zero on the right channel amps so I obviously have a problem but am now not sure where to look for it. Any help would be welcomed


pinkmouse 8th April 2011 09:04 AM

First things first, test each module in isolation, preferably on the bench with a separate PSU. Then you can work though and eliminate each component as the source of the problem. However, I suspect an earthing problem, something is not tied to ground properly so voltages are floating.

jandr49 8th April 2011 12:36 PM

Many thanks for the advise

pinkmouse 8th April 2011 01:19 PM

Oh, and make yourself a lightbulb tester. ;)

jandr49 8th April 2011 01:44 PM

I've already got one but I'm not sure how I can use it to problem solve an earthing problem

pinkmouse 8th April 2011 01:48 PM

You can't directly, but using it is always good practice, just in case. ;)

formula 22 18th September 2011 01:13 PM

In order to gain the 27dB reduction in quality amps that I should lose nothing?

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