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Old 23rd February 2014, 10:35 PM   #1
Defo is offline Defo  Norway
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Default Change input voltage on Bash 500W sub amp

I have this Partsexpress Bash 500W subwoofer amp, that I wish to convert to 220/240v if possible.

I have little experience with electronics, but I figured it might be easily done, since most amps of this type has a swich for it by default, and since its a switch-mode power supply.

Can anyone tell me if its possible to do this without too much trouble? See attached pics.
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File Type: jpg 20140224_002730.jpg (781.2 KB, 92 views)
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Old 23rd February 2014, 10:52 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

Unfortunately high powered switch mode supplies
tend to be optimised for around 115VAC or 230VAC
and they cannot be converted between the voltages.

rgds, sreten.
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Old 24th February 2014, 10:53 AM   #3
Defo is offline Defo  Norway
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Thats unfortunate. One would think it would be an easy fix, since these types of amps, usually have a simple switch for it...
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Old 24th February 2014, 02:59 PM   #4
PetruV is offline PetruV  Romania
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It sometimes can be done,but depends, if it has 2x 200v caps then maybe
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Old 24th February 2014, 03:07 PM   #5
Defo is offline Defo  Norway
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The two large black caps near the power input are both 200v, as well as the smaller one farther away.
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Old 24th February 2014, 08:05 PM   #6
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Defo View Post
Thats unfortunate. One would think it would be an easy fix,
since these types of amps, usually have a simple switch for it...
Hi,

No.
Normal power supplies have series parallel
primaries and thus are easily switched.

Lower power switched supplies can handle both, but I've
never seen a switched supply with a 115/230 switch.

200V caps haven't a prayer of handling 240VAC,
they are what you need for around 115VAC.

rgds, sreten.
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Last edited by sreten; 24th February 2014 at 08:09 PM.
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Old 24th February 2014, 08:58 PM   #7
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Most of the switchable types of supplies will have 2x 200V caps,because they use a voltage doubler (from 120Vac),or lift/open (with the 120/240V switch) the 'center tap',as it were,for 240Vac use. Either way,it gets rectified to ~320Vdc,which is what the supply then runs from.

Looking at your supply,it *may* be possible,by cutting a trace,or jumper wire. Trace out the AC input circuitry,and see what you've got.

Take a look at this,to see what I mean:
http://sound.westhost.com/lamps/pfc0-f3.gif
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Old 24th February 2014, 10:00 PM   #8
Defo is offline Defo  Norway
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It seems that the circut board is glued to the amp frame, so I cant remove it to trace the path I guess that also means it will be impossible to do the modification?

Here is a nearfield image if its of any help.
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Old 25th February 2014, 06:46 PM   #9
Defo is offline Defo  Norway
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Can a transformer of this type be used?

SK 20E Voltage Step Down Transformer Converter 220 240V to 100V 1000W for Europe | eBay
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