Announcement

Collapse
No announcement yet.

2x250 IRS2092 amp build

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #76
    Re: 2x250 IRS2092 amp build

    Originally posted by PWR RYD View Post

    Hong,
    Yes technically if you are looking from +V to -V there are two caps wired in series. But every thing in the electronics world is almost always referenced to common (or ground). In that case there is only one cap (it is actually two 20,000uF in parallel) from the +V rail to ground and one cap from the -V rail to ground.

    From +v to ground and ground to v-. They are polarized so should the cap on the v- be turned around?


    In my case, with dual rectifiers, should the ground be omitted and the caps be wired individually?
    " 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/

    Comment


    • #77
      Re: 2x250 IRS2092 amp build

      Originally posted by [email protected] View Post
      From +v to ground and ground to v-. They are polarized so should the cap on the v- be turned around?
      No- don't flip it around.
      Later,
      Wolf
      "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
      "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
      "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
      "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

      *InDIYana event website*

      Photobucket pages:
      https://app.photobucket.com/u/wolf_teeth_speaker

      My blog/writeups/thoughts here at PE:
      http://techtalk.parts-express.com/blog.php?u=4102

      Comment


      • #78
        Re: 2x250 IRS2092 amp build

        My psu is exactly like the top one here. GD does not go to the amp, only to ground like the top pic.
        http://techtalk.parts-express.com/at...3&d=1400451374
        " 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/

        Comment


        • #79
          Re: 2x250 IRS2092 amp build

          Originally posted by [email protected] View Post
          My psu is exactly like the top one here. GD does not go to the amp, only to ground like the top pic.
          http://techtalk.parts-express.com/at...3&d=1400451374
          Here's maybe an easier way to see the problem with the original configuration: If you connect a preamp or some other device that has a chassis ground connected to its signal ground (which is often the case), then the "Gnd" at the IRS2092 ("G" in the lower drawing and signal ground for the preamp) will be connected to GD through "earth". That doesn't cause any sparks or high current, because those caps don't have any voltage on them anyway. However, it becomes obvious that the caps "in the middle" aren't contributing to the power supply filtering.

          So you want to get rid of that GD connection. If you just remove it, your caps would be in series, as others have pointed out. So you need to do some rewiring to get all of those caps in parallel. What you have now will actually work, but you are only using half of the capacitors to filter the heavy supply current and the chassis isn't properly connected to signal ground.

          I only posted because it looked like there was still some confusion as to why the original configuration wasn't correct. Hong has the right circuit now. In this case, simpler is better
          Free Passive Speaker Designer Lite (PSD-Lite) -- http://www.audiodevelopers.com/Softw...Lite/setup.exe

          Comment


          • #80
            Re: 2x250 IRS2092 amp build

            Thanks so much for being patient with me. I will make the changes.
            " 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/

            Comment


            • #81
              Re: 2x250 IRS2092 amp build

              Originally posted by [email protected] View Post
              Thanks so much for being patient with me.
              You did a good job on the chassis. I'm glad to see more people getting involved in amp-building.

              The grounding is always the most mysterious part of amp-building, especially when you make your own boards. Many years ago I built a six-channel amp that oscillated and fried the outputs whenever I turned it on. By the time I separated out all of the grounds and got the amp stable, I was no longer interested in working on it. Also, I had used power-hungry TTL logic for front panel touch switches and needed to redesign too much to use those new CMOS devices, so I moved on...

              I've always been afraid of electricity--I always dread that first flick of the switch. Too many exploding parts over the years :eek:. The worst scare was when I was debugging that six-channel amp with an oscilloscope. It used a triac/zero-crossing circuit to turn on and off the power, and it never occurred to me that putting a scope ground probe on the AC line wasn't a good idea. It actually vaporized the scope probe ground wire. I know it takes some nerve and guts to work on amps, so I admire your desire to work on this stuff.

              Keep it up and don't get frustrated--it's a fun hobby with good rewards.
              Free Passive Speaker Designer Lite (PSD-Lite) -- http://www.audiodevelopers.com/Softw...Lite/setup.exe

              Comment


              • #82
                Re: 2x250 IRS2092 amp build

                I don't feel too bad now after reading this Neil. I've had exploding caps, major sparks from allowing wires to touch each other, melting resistors, and too-numerous-to-count mishaps trying to understand how to put an amp together. Thanks for the encouragement, the guidance, and taking time to answer our noobish questions.

                Hong

                Originally posted by neildavis View Post
                You did a good job on the chassis. I'm glad to see more people getting involved in amp-building.

                The grounding is always the most mysterious part of amp-building, especially when you make your own boards. Many years ago I built a six-channel amp that oscillated and fried the outputs whenever I turned it on. By the time I separated out all of the grounds and got the amp stable, I was no longer interested in working on it. Also, I had used power-hungry TTL logic for front panel touch switches and needed to redesign too much to use those new CMOS devices, so I moved on...

                I've always been afraid of electricity--I always dread that first flick of the switch. Too many exploding parts over the years :eek:. The worst scare was when I was debugging that six-channel amp with an oscilloscope. It used a triac/zero-crossing circuit to turn on and off the power, and it never occurred to me that putting a scope ground probe on the AC line wasn't a good idea. It actually vaporized the scope probe ground wire. I know it takes some nerve and guts to work on amps, so I admire your desire to work on this stuff.

                Keep it up and don't get frustrated--it's a fun hobby with good rewards.
                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


                • #83
                  Re: 2x250 IRS2092 amp build

                  I'm not sure if that is encouragement or discouragement :eek:
                  Craig

                  I drive way too fast to worry about cholesterol.

                  Comment


                  • #84
                    Re: 2x250 IRS2092 amp build

                    Craig, you wouldn't qualify to work on the suicide hotline for sure.

                    Originally posted by PWR RYD View Post
                    I'm not sure if that is encouragement or discouragement :eek:
                    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


                    • #85
                      Re: 2x250 IRS2092 amp build

                      made the changes and no magic smoke! Thanks to all!

                      " 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/

                      Comment


                      • #86
                        Re: 2x250 IRS2092 amp build

                        I'll bet the fingers were trembling a little bit before you hit the Power Switch.....That would be normal.:D


                        Bob
                        NLA

                        Comment


                        • #87
                          Re: 2x250 IRS2092 amp build

                          Can you tell any difference?

                          Comment


                          • #88
                            Re: 2x250 IRS2092 amp build

                            NO Robert. I just knew that it would be fine. Hong said he would go on a gameshow and win me a new car if it didn't work perfectly!
                            I won't really know if it is a huge improvement until I get it in the home theater. In my small room, its great.
                            " 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/

                            Comment


                            • #89
                              Re: 2x250 IRS2092 amp build

                              oops
                              Last edited by [email protected]; 05-23-2014, 11:07 PM.
                              " 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/

                              Comment


                              • #90
                                Re: 2x250 IRS2092 amp build

                                Hong also promised to install a stainless steel pole in Lowell's living room, and give him a one-year free supply of strippers if the PSU didn't work. Anyone else wants this deal?

                                Originally posted by [email protected] View Post
                                NO Robert. I just knew that it would be fine. Hong said he would go on a gameshow and win me a new car if it didn't work perfectly!
                                I won't really know if it is a huge improvement until I get it in the home theater. In my small room, its great.
                                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

                                Working...
                                X