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Old 6th October 2012, 09:53 PM   #1
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Default abletec alc1000-1300

hope someone can help with a problem i have with these modules.i have sent messages to a couple of members but am waiting for a reply.
i have quite bad hum from the amps.this is my first attempt at assembling an amp, which is why i went for the abletec as they say it is almost plug and play.
i have wired for unbalanced rca connection but not sure if i need to connect pin 7 or 8 to negative input pin to ground the input.if so do i just jump across from pin 7 or 8 to the -input pin?
is this why i am getting the hum?
any help would be great.
thanks
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Old 7th October 2012, 04:44 PM   #2
rolls is offline rolls  Switzerland
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Join Date: Aug 2007
Quote:
Originally Posted by fransiscan View Post
hope someone can help with a problem i have with these modules.i have sent messages to a couple of members but am waiting for a reply.
i have quite bad hum from the amps.this is my first attempt at assembling an amp, which is why i went for the abletec as they say it is almost plug and play.
i have wired for unbalanced rca connection but not sure if i need to connect pin 7 or 8 to negative input pin to ground the input.if so do i just jump across from pin 7 or 8 to the -input pin?
is this why i am getting the hum?
any help would be great.
thanks
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Old 8th October 2012, 10:59 AM   #3
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Join Date: Jun 2012
Location: HSK, Germany
Hi fransiscan

Sorry, i can't help you.
But for the other people this can be helpful.
Productsite
Datasheet look at site 4 and 5

Last edited by Indemini; 8th October 2012 at 11:14 AM.
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Old 8th October 2012, 04:49 PM   #4
rolls is offline rolls  Switzerland
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Sorry, but my text vanished.
The amp has to be connected to ground:
- If the preamp is grounded, nothing has to be done.
- If not, connect 7 or 8 to ground
- If you have done both, there could be hum because of a ground loop

André
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Old 11th October 2012, 08:47 AM   #5
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thanks for the help guys.sorted the hum by removing the mains earth.been told its fine as it is a double insulated product.
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Old 29th December 2012, 05:48 AM   #6
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Join Date: Oct 2011
another question re the abletecs.for a first timer, how would i incorporate remote turn on from a pre-amp with 12volt trigger output.or how to enable standby from a signal sensing circuit.
thanks
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