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Old 19th November 2012, 08:14 PM   #1
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Default How good / bad is this amp made?

I've been using this AudioSource amp for my surround sound for couple years and the "auto on" sensor went bad and I decided to open it up. It's a stereo amp rated at 100W.

Can you tell something about this amp from this picture? Looks to me, it has no soft-start or speaker protection circuit.

Click the image to open in full size.

Since I already replaced it with another amp, I thought about salvaging parts from this for a diy amp. What are your thoughts?
Thanks in advance.

Last edited by Evenharmonics; 19th November 2012 at 11:58 PM.
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Old 19th November 2012, 08:43 PM   #2
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I would not touch it with someone else's soldering iron. Regards
Evil looms. Cowboy up. Kill it. Get Paid.
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Old 19th November 2012, 08:53 PM   #3
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Use transformer for a different project
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Old 19th November 2012, 08:54 PM   #4
Bare is offline Bare  Canada
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Well It can't be all that bad sounding If you've been using it for years :-).
Isn't the relay box at the end of the input board some kind of protection thump/circuit?
Parts board(s) quality doesn't seem impressive in the photo.
But certainly the pieces are salvageable, ie; Case, transformer, heat sink and connectors seem suitable for reuse.
Often/usually those bits are ..The ..most expensive parts of a DIY amp.
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Old 19th November 2012, 08:56 PM   #5
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take no offence,please.

but cheap boards, not much for caps on power supply.
but you have a case and heatsink maybe a transformer for a start to somthing better.
maybe a pre.
I'm not crazy, my mother had me tested
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Old 19th November 2012, 08:57 PM   #6
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i type slow i guess
I'm not crazy, my mother had me tested
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Old 19th November 2012, 09:04 PM   #7
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I wasn't expecting much of quality from $99 (new) stereo amp. 2 years of moderate use as surround sound for my home theater wasn't so bad, I guess.

Existing power supply doesn't seem much for a stereo amp, as if they skimped on it.

Thanks for the inputs.
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Old 19th November 2012, 09:10 PM   #8
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There's no reason (yet) to believe it's any worse than other amps posted here. A schematic would help to make a more informed decision as to what is worth keeping or losing. If some parts aren't the fancy types guys admire, it's no big deal to swap them for whatever types are popular.

OTOH, binning the PCBs and starting another amp from scratch is a major job with no guarantees you will get discernible improvement anyway.
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Old 19th November 2012, 09:24 PM   #9
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Knowing the numbers on the chips would tell us a lot more of its quality and capability than judging it by the color of its PCB's and components.

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Old 19th November 2012, 09:34 PM   #10
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Default You have a nice enclosure, a reasonable power transformer

heatsink to 50 watts continuous or 100 watts of music... and all connectors needed to assemble a diy audio amplifier.

This can save a lot of money if you have such kind of intention.

Any diy audio amplifier published in this forum will be better than this was made to be cheap, a lot of integrated circuits to reduce cost..small condenser into the supply, 3A diodes...anything special on it...and it looks you have integrated circuits in the output..and these folks are good for 30 watts rms and not much more than that to each channel because of dissipation it is really a chip amplifier (i could not see, picture has not good resolution and focus)... then it is just a pretty toy...not serious if you compare with our average diy amplifiers offered in our forum.

I do think you will have only pleasure doing it....well.... this is what i feel, but this depends on your character, your passion, your skills, your know how, your time to do it, how much money you can spend.... well..depends on a lot of things.

Watching it i feel myself interested in this enclosure, this transformer, this heatsink and i would dismantle and install all connectors back to place..will see if it has some peak meter to be used and will be starting to research what to build.

This looks cheap...looks simple...the performance may be average..we have top performers in this can have it easy..there's no junk schematics in this least i could not see junk here.


Sorry, Brazil only to be sold... top secret ultimate schematic, not to share...encapsulated VAS:

Last edited by destroyer X; 19th November 2012 at 09:37 PM.
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