DIY 600 Watt Amplifier With Old Computer SMPS




About: Hi my name is Steve and i'm a Creative and I got Technical skills i can build anything just stick to my account . I'm a YouTuber so you also can see my all videos here

Hey! everyone My name is Steve .

Today i'm going to show you How to make a 600 watt amplifier With Computer Power Supply

Click Here to See The Video

Let's Start

Step 1: Features

Power Output

  • 600 watt x 1 mono

Power Input

  • 48V 10A DC

Input & Output

  • RCA input
  • Speakon Output


  • Thermal cool down @ 50 degree Centigrade ( Fan kicked up )
  • Short Circuit Protection
  • Overheat Protection
  • Overload Protection
  • Revers Polarty Protection
  • Low Pass Filter Built In
  • Very Low distortion
  • PurePath™ HD Technology
  • Class D technology

Step 2: Stuff I Used

Where To Buy "Cheapest"



Banggood is an online platform for electronic technicians, Makers, Enthusiasts, Kids to find electronic components

Step 3: Opening

  • First of all i used a screw driver to unscrew the 4 screw on the SMPS
  • And then i opened the SMPS
  • and again i unscrew the main PCB board and removed it "See the image "
  • and then i unscrew the power input socket
  • and then i unscrew the fan
  • and then i cleaned it with some old cloth

Step 4: Drilling

  • I drilled 4 holes to mount the Main amplifier board " you have to figure that out "
  • I drilled 1 small hole for speakon connector and i used a step drill bit to match the Speakon Dimension
  • And then i drilled 2 small holes for RCA input and then i used a step drill bit to match the RCA Dimension
  • And then i drilled a small hole for volume port and used a step drill bit to match the port dimension
  • And then i took a Copper Clad to cover the power input hole and did some hole to match the port dimension "See the Image "

Step 5: Giving It Some Look

  • I used Carbon Fiber Vinyl Red & Black to give it such look
  • First i cover the Copper clad with red vinyl
  • and Secondly i cover the SMPS Body
  • Don't Forget to cut out the air vents

Step 6: Installation

  • Firstly i stick the copper clad with some super glue
  • and then i installed volume port to the copper clad
  • and then i installed the fan
  • and then i installed the Speakon Connector
  • and then i installed the RCA input Socket

Step 7: Connections

  • I Soldered some stereo wire to the RCA input
  • and then i used a female header to soldered the end
  • and then i used 2 wire to solder the speaker output on the Amplifier Board
  • and then again i used 2 wire to Solder the Power Input on the Amplifier Board
  • and then i used 4 screw to screw the main amplifier board to the SMPS box
  • and then i used ribbon wire to connect the Amplifier board to volume control board
  • and then i soldered the 2 speaker output wire coming from the amplifier board to Speakon Connector and used a heat-shrink tube to secure the connection
  • and then i connected XT60 connector to the power input wire coming from the amplifier
  • and i used some hot glue to stick the XT60 to the box " See the Image "
  • and then i connected female header coming from RCA input wire to the Volume control board

Step 8: Fan Controller

  • I used a temperature controlled switch for turning on the fan at 50 degree Celsius
  • I soldered 2 wire on the amplifier board " the amplifier converts 48v to 12v dc for the fan "
  • and then i connected 2 wire to the control board
  • and then i connected fan wire to the control board
  • and then i used dual sided tape to hold the board to the SMPS box " See the Image"
  • and then i connected temperature sensor to the control board
  • and then i powered the whole thing up with a 48V 10A power supply
  • and then i set the trigger temperature
  • and then i used some silicone glue to stick the sensor to heat-sink
  • and then i used 2 led and a resistance in series and connected to the 12v rail

Set the Temperature

  • tap to set button
  • tap to "+" and "-" to set the temperature
  • tap set button to save the settings

Step 9: Finishing

Close the SMPS box and screw the 4 screw

Click Here to See The Video

You Just Made It

Now just Plug the power and enjoy

Thank you for visiting my Instructables Stay tuned for next Projects



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    20 Discussions


    2 years ago

    Could you publish the schematics please ?

    You know you're a genius, you are able to deliver 600W with a 48V 10A supply, you produce 120W from nowhere. May I suggest to send these 120W to the DC supply, after a while you could disconnect the PSU as the amp will be auto supplied. Sorry, that's not funny.

    6 replies

    Reply 10 months ago

    Haha no that was really funny. But just need bigger psu. You can get 580 with no distortion but will draw 15 amps


    Reply 2 years ago

    I have to admit I was wondering how 600 watts came from 48 volts @ 10 amps myself. Even at 100% efficiency, which can never happen ever, It would only be 480 watts. IDK.


    What GordonS6 and rafununu object is that "peak" power is meaningless... It is like trying to rate the instantaneous power for, say an automobile: you could argue that your VW Bug has, say, 1,200 HP... and maybe it can, imagine you attach a very heavy trailer. If you step on the acccelerator pedal for several seconds and then suddenly release the clutch, for a very brief (and useless) fraction of a second, the poor VW would develop a true 1,200 HP, and then die, but the trailer hardly moved a fraction of na inch!.

    So called ""PMPO" power ratings are completely misleading and useless, those are akin to raise the volume to the top, and then shorting the output! A much better practice is to specify the continuous power (sometimes wrongly stated as "RMS Power") into a defined load of 8 Ohms, from 20-20,000 Hz with less than 0.1% harmonic distortion, for example.


    Reply 2 years ago

    By running the amp well below rated, one avoids distortion. Of course, noise from unshielded power circuit could be an issue...


    Reply 2 years ago

    Avoiding distortion? only if you set gain correctly, otherwise signal will begin to clip, so you would probably have to add some resistors on signal input


    2 years ago

    You managed to reuse tge fan and case of PSU, that's good.
    But the point is they are not unique--build a new case out of other unused things is easy, while computer fan is also easily obtainable.
    What's special in your design?

    1 reply

    2 years ago

    Most audio amplifiers are output rated "PIP", that is "peak instantaneous power". Same with speakers. The RMS (root mean square) continuous power output is likely less than 50 watts. An honest 50 watts should rattle your windows!

    4 replies

    Reply 2 years ago

    Most audio amplifiers are not rated using peak instantaneous power (unless they are complete garbage, and being marketed by charlatans).
    PIP ratings are a scam, and no quality manufacture uses it to rate their products.


    Reply 2 years ago

    I concur, and know what youre saying, marketing ppl are the worst lol...
    But oddly enough, sometimes peak instantaneous power can be a very critical number in large professional sound setups, like stages and such. It is Especially useful for the low end! But consumer marketing has gotten ahold of a once truthful measurement and distorted it so much that no one knows what it means anymore, just a cheap tactic to get you to buy... :/


    Reply 1 year ago

    PIP is never a useful value, and you will essentially never see it in the specs of quality sound equipment, professional or otherwise, because it is a totally useless value.
    First, since what constitutes "instantaneous" has no definition, the value has no meaning, and second, how much power a circuit can take in extremely transitory time periods simply has no bearing on audio performance or longevity.


    Reply 1 year ago

    This thing is true 600w, but at 2Ohm and with 700w supply, with 480w supply its close to 400w without clipping, if you add 8ohm speakers (which most of home speakers are) its down to 100-150w


    2 years ago

    It is hard to be nice here... The title is highly misleading... And measures seems to be best (and unsustained) wishes...


    2 years ago

    I kind of wiah this instructable was called "how to build a 600w class d audio amp from storebought components and the case of an old atx power supply" lol...
    The current title makes it seem like you are using the power supply mosfets to drive a speaker in a circuit that you build. Which would be awesome! But all in all its a nice instructable that looks like you spent ample time to make, and to make right!

    1 reply

    Reply 2 years ago

    YEAH the bait thing, but i understand him.


    2 years ago

    This has some good construction ideas which I will consider using in my own projects.

    Your 600W claim is a fantasy.


    2 years ago

    This is a very well written Instructable. You show great detailed photos and explain your progress. Also, the finished project looks very good!

    The only issue I have is that your title is misleading, You really only used the box and added store bought components. If you'll change the title and maybe edit the "peak" power number to the actual power rating, this would be a VERY complete Instructable! I applaud your creativity! Keep on building!!