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Thread: Bridged Phase Linear series ll

  1. #1
    Forum Veteran grapplesaw's Avatar
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    Bridged Phase Linear series ll

    I will start my new build thread Of a stereo / mono 400

    This build was started in concept last spring. There is much debate as it being a good idea to build this configuration or not. Forseen problems of high heat and reduced sound quality are to be concerned about.

    After a push from Lee and Perry to build some monster monos I set out to build this mini mono before going all in.

    It is a simple enough concept and with the help from THD+N and a board he made a few years ago that I have been holding onto.

    The design for mono setup is basically having one inverted channel with one conventional channel and connecting the two hot outs to the speakers.

    The bridge of the two channels does two things. First it addes the two channels into one. But doing this when using a 8 ohm load it instead sees it as a 4 ohm load a again amplifies the power output. So we will see what tha is during testing. THD will also be interesting to see if ther is much change from the un bridged state of the amp. Other issue are the actual rail voltage vs that seen by the drivers.

    I will try some things in the build that may seam a little over the top but who cares.
    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

  2. #2
    Forum Veteran grapplesaw's Avatar
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    Here is what makes it work

    The control board has a dual opamp in each channel. This can make a inverted output. Other ways to invert the channels is running through a centre tap transformer on the inputs.

    The amp amp will remain useful as a stereo amp if wanted. The only thing that needs to be done is pug a mono speaker into the two hot output binding posts. There is no ground as such for mono.

    the board is a basic PL36 with some nice additions of decoupling caps, power supply capsand the dual opamp setup. It also has extra heavy copper traces.
    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

  3. #3
    Forum Veteran grapplesaw's Avatar
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    Pl36 v2 board

    I changed the board to go full complimentary. X mark removed components not needed. The white wire is needed to supply fused neg voltage to output trans collector.

    The board has high pass filter mounting point if wanted, I am bypassing this.
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    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

  4. #4
    Forum Veteran grapplesaw's Avatar
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    Starting with the chassis

    I modified the chassic to add thermo switch and fan plug in center of backplate
    before and after shots
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    Last edited by grapplesaw; 09-30-2017 at 04:58 PM.
    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

  5. #5
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    laatsch55's Avatar
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    Halfbiass...Electron Herder and Backass Woof
    Doin a lot of work on that bugger Glen...
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

    " I Just Collect Smiles Craig......Cheap Smiles!-----Fishoz-2017

    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

    " You have not reached the point of diminishing returns, you've just ran out of money

    " The Pioneer U-24, unfortunately, is just too expensive and rare to find. That's why I have one."--Nando-2014

  6. #6
    Forum Veteran grapplesaw's Avatar
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    Quote Originally Posted by laatsch55 View Post
    Doin a lot of work on that bugger Glen...
    Crazy isn’t it
    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

  7. #7
    Administrator
    laatsch55's Avatar
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    Halfbiass...Electron Herder and Backass Woof
    Yeppers, you do get into those projects bud.....super cool...
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

    " I Just Collect Smiles Craig......Cheap Smiles!-----Fishoz-2017

    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

    " You have not reached the point of diminishing returns, you've just ran out of money

    " The Pioneer U-24, unfortunately, is just too expensive and rare to find. That's why I have one."--Nando-2014

  8. #8
    Forum Veteran grapplesaw's Avatar
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    I upgraded Don’s DCP board with 3 watt resistors 450 volt Zobel caps and meter terminals on board. Used 3/8” stainless standoff’s to get a little more clearance from the backplate.
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    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

  9. #9
    Forum Veteran grapplesaw's Avatar
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    Powercaps and ac terminals

    So we need some juice to amp this thing up ,right? I added one of Joe’s cap kits to get 16,000uf per rail. They are mounted to side wall of chassic. 50 amp Bridge rectifier and 1/2watt thermal reset fuse for meter supply.
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    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

  10. #10
    Forum Veteran grapplesaw's Avatar
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    Backplates mod

    So I did not have a set of Joe’s Backplates so I put in a few changes of my own. Removed the ferrite beads and added a few more versions caps to power rails. One watt bias resistors.
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    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

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