Do any of you guys know much about BASH power supplies?... - diyAudio
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Old 3rd October 2004, 04:58 AM   #1
Illusus is offline Illusus  Canada
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Default Do any of you guys know much about BASH power supplies?...

...or where to find some info/help on the subject?

I was given a 'broken' Boston Acoustics PV800 sub, a guy I work with figured I could do something with it. It has a BASH amplifier, with power on the PS emits a high pitched buzz (like a camera flash cpacitor powering up). I checked every stage and tracked it down to the PS. There is one large cap in the PS, a 200V 680uf, that's domed a bit, I'll replace it. I don't know anything about this type of power supply and don't know if there are any common areas to check first. Suggestions?
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Old 25th September 2008, 09:32 PM   #2
brybo86 is offline brybo86  United States
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Default bash amplifier pv800

i too got a broken pv800 from a friend, the bash amp appears to have been melted in a few spots? I was just wondering what you ended up doing with it?
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Old 25th September 2008, 10:03 PM   #3
Illusus is offline Illusus  Canada
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It ended up in the trash heap. I didn't get it to work.

They are pretty cheap online (can't remember where offhand(google) or you can buy a really nice plate amp from Steve at Apexjr.com at a great price.
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Old 25th September 2008, 10:23 PM   #4
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I have a BASH here with a bad power supply. When I'm finished reverse-engineering it, I may be able to help.
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Old 26th September 2008, 02:52 AM   #5
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The bash is a commercial Switch mode power supply (SMPS)
device that runs it's amp class G (variable/dynamic voltage)
for more efficiency.

It seems this amp is not too well designed (no offense)
or they wouldn't be burning up so regularly.

I spent nearly 200$ just to get a REAL 250W DIY sub
amp which is almost as much as a new BASH.

The 620uf cap is most likely the line level reserve before
the switching FET's (same as a PC PS)you should
go to the "Class D" forum as some of the gentlemen
over there build their own SMPS's and would likely
'jump' at the chance to diagnose/comment on your BASH
problem....
OS

BTW, I do know how to repair SMPS's (car amps,PC, monitors)
but the guys over in the Class D forum are "gods".
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