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Old 23rd February 2011, 06:38 PM   #1
Brpeep is offline Brpeep  United States
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Default Power Transformer

I am a new member and I hope the is the proper area for this post. I have a EarthQuake 10" sub with a failed power transformer. Earthquake will only sell the complete replacement Amp. The amp is suppose to be 150w. Any one have a schematic?

Thanks

Bob
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Old 23rd February 2011, 07:35 PM   #2
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Find the model number and post it. Googleing "Earthquake DB-10" is not helping. I presume that this is a home unit if it has a transformer in it.
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Old 23rd February 2011, 10:45 PM   #3
Brpeep is offline Brpeep  United States
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It is a EarthQuake Home sub...Model Nova 10. The unit on Earhquake's website is listed as SuperNova MKIV
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Old 23rd February 2011, 11:05 PM   #4
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Any markings on the transformer or on the PCB where the transformer wires connect?
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Old 24th February 2011, 12:40 AM   #5
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Use the OEM derating of the main supply caps to determine the Trafo.

for example:

50V caps = +/- 40-45Vdc 30-0-30vac trafo

63V caps = +/- 50-55Vdc 40-0-40Vac trafo

The size for a 150 w amp should be 200VA+ ... Antek - AN-2230

Some plates I have seen use 2 amps bridged and can use a lower voltage trafo
(25-0-25v) - 36-38vdc , these still use the 50v caps.

OS
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Old 24th February 2011, 12:50 AM   #6
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Ostripper u-ta-man!
I would be concerned about colateral damage like blown outputs. This can be checked with an ohmeter. Also yank the transformer because you will have to do that anyway, and ohm out the windings. You may have to get creative with the mechanicals, because the Antek transformer might not mount the same way.
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Old 24th February 2011, 12:54 AM   #7
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Oh -- Ill bet this is a chip amp. Cost is going up.
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Old 24th February 2011, 06:01 AM   #8
h_a is offline h_a  Europe
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Blown toroids? A little hard to imagine that nothing else was affected.

Better check for blown outputs or a dead short somewhere.

Hannes
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Old 24th February 2011, 06:47 AM   #9
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Is this an expensive unit? (I know almost nothing about subs).
Unless the amp is something special, it might be simpler to just buy a new amp.
Steve at apexjr has sub amps at good prices (under $100)- he also might be a source for the replacement tranny if that's what's needed.
Just a thought....
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