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My Sure IRS2092 Amplifier Build

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  • #46
    Re: My Sure IRS2092 Amplifier Build

    Originally posted by hongrn View Post
    Bob,

    1. How is the Corian sold? How large a piece does it come in?
    2. Can it be cut with a regular table saw?
    3. How do you polish it?

    Thanks.
    I just researched this in depth - you can find smallish corian pieces on Ebay pretty cheap that are good for faceplates or backpanels.
    You can even find cheap corian cutting boards for larger pieces.

    There are a number of threads here on PETT about working with corian. Consensus I got is that carbide router bits work well,
    but be sure to wear breathing protection.

    HTH,

    I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
    "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

    High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
    SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
    My Voxel min sub Yet-another-Voxel-build

    Tangband W6-sub

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    • #47
      Re: My Sure IRS2092 Amplifier Build

      Originally posted by neildavis View Post
      A good compromise is wood with protruding heatsinks to draw the heat outside the enclosure. Apexjr has some nice heatsinks for $4 that have a lip that makes them easy to flush mount into a wood enclosure. One is probably sufficient for a pair of LM3886 chips, or slice them down to use two smaller heatsinks with one chip apiece.

      [ATTACH=CONFIG]45374[/ATTACH]
      Thanks Neil - now I see what those heatsinks are good for!
      For a Class D amp I'd take a chance with the heatsinks inside the box, but for a Gainclone I want the heatsinks on the outside.

      I think I hear a difference - wow, it's amazing!" Ethan Winer: audio myths
      "As God is my witness I'll never be without a good pair of speakers!" Scarlett O'Hara

      High value, high quality RS150/TB28-537SH bookshelf - TARGAS NLA!
      SB13/Vifa BC25SC06 MTM DCR Galeons-SB13-MTM
      My Voxel min sub Yet-another-Voxel-build

      Tangband W6-sub

      Comment


      • #48
        Re: My Sure IRS2092 Amplifier Build

        Thanks Don. I didn't know Corian generated that much dust.

        Originally posted by donradick View Post
        I just researched this in depth - you can find smallish corian pieces on Ebay pretty cheap that are good for faceplates or backpanels.
        You can even find cheap corian cutting boards for larger pieces.

        There are a number of threads here on PETT about working with corian. Consensus I got is that carbide router bits work well,
        but be sure to wear breathing protection.

        HTH,
        Some people are addicted to Vicodin. I'm addicted to speaker building.

        The Chorales - Usher 8945A/Vifa XT25TG Build
        ESP Project 101 Lateral MOSFET Amplifier
        LM4780 Parallel Chipamp
        Sonata Soundbar Project
        The Renditions - Active/Passive Towers

        Comment


        • #49
          Re: My Sure IRS2092 Amplifier Build

          Great deal there Neil.. $4 is dirt cheap.

          Bob
          NLA

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          • #50
            Re: My Sure IRS2092 Amplifier Build

            Originally posted by hongrn View Post
            Bob,

            1. How is the Corian sold? How large a piece does it come in?
            2. Can it be cut with a regular table saw?
            3. How do you polish it?

            Thanks.
            This site has small Corian pieces. http://solidsurface.com/sheet-materi...rder/sqft_sort

            Ron
            C-Note Iron Driver Build
            The Cherry π's

            Comment


            • #51
              Re: My Sure IRS2092 Amplifier Build

              Great find Ron. See what you started Mr. Bob?
              Some people are addicted to Vicodin. I'm addicted to speaker building.

              The Chorales - Usher 8945A/Vifa XT25TG Build
              ESP Project 101 Lateral MOSFET Amplifier
              LM4780 Parallel Chipamp
              Sonata Soundbar Project
              The Renditions - Active/Passive Towers

              Comment


              • #52
                Re: My Sure IRS2092 Amplifier Build

                I may have started it but you guys are going to finish it...Gentleman start your routers :D

                Bob..Watching from the bleachers
                NLA

                Comment


                • #53
                  Re: My Sure IRS2092 Amplifier Build

                  Some stupid questions from a stupid person (um...me)...so be gentle...

                  I can't find any power info on the IRS2092 datasheet. From what I've seen with chip amps, the power is directly related to the supply voltage. It appears the IR reference design to get 250W at 8ohm requires +/-70V. The Sure uses 55 to 65V rails, but claims the same power (250W into 8ohms). Is the Sure making that or is it lower power (such as at the +/-56V used here)?

                  Stupid #2: Does the power supply boost the transformer's voltage? I thought it just provides filtering, but the output of Hong's transformer is +/-40V while the PS output is +/-56V.

                  Thanks.
                  Nichikuros - Peerless 831735 Nomex + Vifa NE25VTA
                  Digger8 - Small compact 8" sub with F3 = 20Hz
                  Madison-D and Madison-R - Tang Band W4-1720 + Vifa BC25SC06 or Beston RT003C (TM and MTM)
                  Jeffrey - Tang Band W5-704D + Beston RT003C
                  Jasmine - Fountek FW146 + Fountek NeoCD3.0 Ribbon in Pioneer BS21 Cabinet

                  Comment


                  • #54
                    Re: My Sure IRS2092 Amplifier Build

                    Regarding #2, the transformer voltage is VAC which is RMS. The DC output is the peak voltage (1.41 times VAC RMS) after rectification and the large caps.

                    Comment


                    • #55
                      Re: My Sure IRS2092 Amplifier Build

                      I hope Neil will chime in to answer your question #1 about the voltage requirement versus output, but yes, the higher the voltage, the higher the output. The Sure amp is built for rail voltage between 55VDC and 65VDC, and exceeding 65VDC will shut it down.

                      On question #2, transformers are rated in AC voltage, which is rectified to DC voltage through a bridge rectifier. To figure out the DC voltage, you take the AC voltage and multiply it by 1.41. Since the maximum DC voltage for the Sure amp is 65VDC, 65/1.41=46, you can theoretically pick a transformer with 45VAC secondaries for the amp. However, keep in mind that house voltage can vary by as much as 10%, so there's a chance the rectified voltage may go over 65VDC, triggering the amp to shut down. That's why I picked a transformer with 40VAC secondaries, rectified to 56.4VDC (40x1.41=56.4) to power the amp and stay within its voltage requirement. I hope this helps.

                      Originally posted by jsr View Post
                      Some stupid questions from a stupid person (um...me)...so be gentle...

                      I can't find any power info on the IRS2092 datasheet. From what I've seen with chip amps, the power is directly related to the supply voltage. It appears the IR reference design to get 250W at 8ohm requires +/-70V. The Sure uses 55 to 65V rails, but claims the same power (250W into 8ohms). Is the Sure making that or is it lower power (such as at the +/-56V used here)?

                      Stupid #2: Does the power supply boost the transformer's voltage? I thought it just provides filtering, but the output of Hong's transformer is +/-40V while the PS output is +/-56V.

                      Thanks.
                      Some people are addicted to Vicodin. I'm addicted to speaker building.

                      The Chorales - Usher 8945A/Vifa XT25TG Build
                      ESP Project 101 Lateral MOSFET Amplifier
                      LM4780 Parallel Chipamp
                      Sonata Soundbar Project
                      The Renditions - Active/Passive Towers

                      Comment


                      • #56
                        Re: My Sure IRS2092 Amplifier Build

                        Ha forgot about the rms thing. Told ya it was stupid. Thanks guys.
                        Nichikuros - Peerless 831735 Nomex + Vifa NE25VTA
                        Digger8 - Small compact 8" sub with F3 = 20Hz
                        Madison-D and Madison-R - Tang Band W4-1720 + Vifa BC25SC06 or Beston RT003C (TM and MTM)
                        Jeffrey - Tang Band W5-704D + Beston RT003C
                        Jasmine - Fountek FW146 + Fountek NeoCD3.0 Ribbon in Pioneer BS21 Cabinet

                        Comment


                        • #57
                          Re: My Sure IRS2092 Amplifier Build

                          I built one with a 40-40 and ended up with 60.3vdc. Its really nice.
                          " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

                          Quote Originally Posted by hongrn. Oct 2014
                          Do you realize that being an American is like winning the biggest jackpot ever??

                          http://www.midwestaudioclub.com/spot...owell-simpson/
                          http://s413.photobucket.com/albums/pp216/arlis/

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                          • #58
                            Re: My Sure IRS2092 Amplifier Build

                            Originally posted by hongrn View Post
                            I hope Neil will chime in to answer your question #1 about the voltage requirement versus output, but yes, the higher the voltage, the higher the output. The Sure amp is built for rail voltage between 55VDC and 65VDC, and exceeding 65VDC will shut it down.
                            Click image for larger version

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                            The other thing to consider is the behavior with lower impedance loads. The most important specification to consider for an amplifier is the safe operating area (SOA) of the output devices. The SOA curve for the output devices used in the reference amp is shown in the second attachment. What's most important about this curve is that it shows how you can have high voltage across the device at reduced currents, or high current at low voltages, but you can't have both high voltage and high current (which would be "outside" the dashed lines). The SOA curves are for single pulses, and it's not clear how you would select the curve for a class D amp, where the pulses are repetitive, but the key take-away here is that the amp will be able to deliver more current with low voltage rails. For example, if you run the amp with 50V rails you would only get (50/1.41)^2/8, or 157W for an 8 ohm load. However, at that lower voltage you could use a 4 ohm load and still stay safely within the SOA curve. At 4 ohms, the amps will put out a bit more than 250W, according to the measurements in the IR reference design document. So that's another reason for accepting the Sure product as a 250Wx2 amp.
                            Click image for larger version

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                            Kind of a wordy answer, but hopefully the technical issues are clear. The simple answer is that the board is in the 250Wx2 class, and how much power you *actually* get depends on the supply voltage and the load.
                            Free Passive Speaker Designer Lite (PSD-Lite) -- http://www.audiodevelopers.com/Softw...Lite/setup.exe

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                            • #59
                              Re: My Sure IRS2092 Amplifier Build

                              Thanks Neil, you ARE the amp sifu...
                              Some people are addicted to Vicodin. I'm addicted to speaker building.

                              The Chorales - Usher 8945A/Vifa XT25TG Build
                              ESP Project 101 Lateral MOSFET Amplifier
                              LM4780 Parallel Chipamp
                              Sonata Soundbar Project
                              The Renditions - Active/Passive Towers

                              Comment


                              • #60
                                Re: My Sure IRS2092 Amplifier Build

                                Originally posted by robertcottiers View Post
                                do is use a cove bit on either side of the power switch and a simple chamfer around the perimeter....

                                Bob
                                Actually- that would be a 'core-box' router bit, not a cove. Coves imply using an edge with the bearing guide, whereas, the Core-Box bits require you either use a router table or an added/clamped straight edge to guide your router/wood.

                                Agreed on the Forstner bits....

                                Later,
                                Wolf
                                "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                                "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
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