Power Transformer

Brpeep · 23rd February 2011, 06:38 PM

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

firechief · 23rd February 2011, 07:35 PM

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.

Brpeep · 23rd February 2011, 10:45 PM

It is a EarthQuake Home sub...Model Nova 10. The unit on Earhquake's website is listed as SuperNova MKIV

VictoriaGuy · 23rd February 2011, 11:05 PM

Any markings on the transformer or on the PCB where the transformer wires connect?

ostripper · 24th February 2011, 12:40 AM

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

firechief · 24th February 2011, 12:50 AM

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.

firechief · 24th February 2011, 12:54 AM

Oh -- Ill bet this is a chip amp. Cost is going up.

h_a · 24th February 2011, 06:01 AM

Blown toroids? A little hard to imagine that nothing else was affected.

Better check for blown outputs or a dead short somewhere.

Hannes

VictoriaGuy · 24th February 2011, 06:47 AM

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....

23rd February 2011, 06:38 PM	#1
Brpeep diyAudio Member Join Date: Feb 2011	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

24th February 2011, 12:40 AM	#5
ostripper diyAudio Member Join Date: May 2008 Location: Albany , NY (smallbany)	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 __________________ Mongrel website , always current and updated : http://67.248.209.21/D%3A/WEBSITE/

24th February 2011, 06:01 AM	#8
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	Blown toroids? A little hard to imagine that nothing else was affected. Better check for blown outputs or a dead short somewhere. Hannes __________________ fresh matched IRFP240/IRFP9240 fets \|\| AlephJ/JX-kits F5 transistor kits \|\| Burning Amp BA-1/2/3 transistor kits

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23rd February 2011, 07:35 PM	#2
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	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.

23rd February 2011, 10:45 PM	#3
Brpeep diyAudio Member Join Date: Feb 2011	It is a EarthQuake Home sub...Model Nova 10. The unit on Earhquake's website is listed as SuperNova MKIV

23rd February 2011, 11:05 PM	#4
VictoriaGuy diyAudio Member Join Date: Dec 2008 Location: Victoria, BC	Any markings on the transformer or on the PCB where the transformer wires connect?

24th February 2011, 12:50 AM	#6
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	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.

24th February 2011, 12:54 AM	#7
firechief diyAudio Member Join Date: Sep 2008 Location: Near Seattle Wa	Oh -- Ill bet this is a chip amp. Cost is going up.

24th February 2011, 06:47 AM	#9
VictoriaGuy diyAudio Member Join Date: Dec 2008 Location: Victoria, BC	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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