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Thread: Fully Discrete 400 / 700 Driver Circuit (Full Comp Only)

  1. #21
    Forum Veteran WOPL Sniffer's Avatar
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    Screw it
    I guess I'm wondering about the backplane.... use the old shit from P L, or use Joe's good backplane?
    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
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  2. #22
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    Screw it
    The DCP sits on top of the speaker jacks, is the new board so big as to invade the fuse holder AND speaker jack space?
    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
    Kenner Close N Play

  3. #23
    Forum Veteran grapplesaw's Avatar
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    Quote Originally Posted by THD+N View Post
    The new PLX driver board is slightly larger than the original PL36. The PLX is 8.25" x 5.75". The original Pl36 is about 6 3/4" x 5 5/8".

    The PLX will fit into 400 and 700 chassis, but I'll have to double check fitting both the PLX and a DCP. I just thought about how popular the DCP is just now.

    The PLX is all one board.
    That will fit with DCP board.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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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. #24
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    ---
    Thanks Glen for confirming that.

    I tried to keep the PLX the same size as the original PL36, but there were just too many components in the new design to use the same size PCB and have room to comfortably layout the components without the PCB being "densely populated".

    Sniffer,
    The PLX will work with the WO backplane. I will make sure the documentation for the PLX clearly covers all the connections points, what they do and where they need to be connected.

  5. #25
    Forum Veteran grapplesaw's Avatar
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    Quote Originally Posted by THD+N View Post
    Thanks Glen for confirming that.

    I tried to keep the PLX the same size as the original PL36, but there were just too many components in the new design to use the same size PCB and have room to comfortably layout the components without the PCB being "densely populated".

    Sniffer,
    The PLX will work with the WO backplane. I will make sure the documentation for the PLX clearly covers all the connections points, what they do and where they need to be connected.
    Nick I emailed you better photos for you to look at
    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

  6. #26
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    ---
    I am going to order boards for my new PL amp design soon. I need 15 for my heard.

    Preliminary Specs (Will be finalized when PCB's come in and testing begins)
    • 100kHz power bandwidth (I don't recommend trying to get 350 Watts out at 100kHz, but it should do it, in theory)
    • Slew rate - 37 V/us (Calculated. In reality, closer to 33 V/us probably)
    • >100dB signal to noise
    • THD+N at 20kHz <0.002% at 350 Watts/8 Ohm
    • 1 Watt frequency response - 0.5Hz ~ 200kHz


    Low distortion and slew rate are not everything and the design will be tweaked for sound quality and stability as well. To my ears, if an amp is "too fast" (high slew rate), it sound cold and clinical (not warm/musical). However, since we all hear differently, this design can be easily manipulated for your listening preference(s) within reasonable limits.

    Let me know if you want to participate in the PCB order, so I can get an order quantity going. It looks like unstuffed PCB's will be $64 shipped in the contiguous US.

    Except for some capacitor values/types, the "amp control board" design is very forgiving and parts selection is not too critical. The drivers and outputs for a full comp version should still use MJ15024/25 or MJ21195/96 transistors.

    Board features will include:
    • FR-4 epoxy glass board
    • Top and bottom solder mask
    • Top silk printing (white)
    • RoHS compliant
    • Double-sided, plated through holes

  7. #27
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    Just curious; Do you have your boards made here in the states or overseas?

    I might be in for one. I like variety. I'll decide today.

  8. #28
    Quote Originally Posted by THD+N View Post
    I am going to order boards for my new PL amp design soon. I need 15 for my heard.

    Preliminary Specs (Will be finalized when PCB's come in and testing begins)
    • 100kHz power bandwidth (I don't recommend trying to get 350 Watts out at 100kHz, but it should do it, in theory)
    • Slew rate - 37 V/us (Calculated. In reality, closer to 33 V/us probably)
    • >100dB signal to noise
    • THD+N at 20kHz <0.002% at 350 Watts/8 Ohm
    • 1 Watt frequency response - 0.5Hz ~ 200kHz


    Low distortion and slew rate are not everything and the design will be tweaked for sound quality and stability as well. To my ears, if an amp is "too fast" (high slew rate), it sound cold and clinical (not warm/musical). However, since we all hear differently, this design can be easily manipulated for your listening preference(s) within reasonable limits.

    Let me know if you want to participate in the PCB order, so I can get an order quantity going. It looks like unstuffed PCB's will be $64 shipped in the contiguous US.

    Except for some capacitor values/types, the "amp control board" design is very forgiving and parts selection is not too critical. The drivers and outputs for a full comp version should still use MJ15024/25 or MJ21195/96 transistors.

    Board features will include:
    • FR-4 epoxy glass board
    • Top and bottom solder mask
    • Top silk printing (white)
    • RoHS compliant
    • Double-sided, plated through holes
    Nick,

    Thanks for offering up some specs on your board.

    Is the S/N ratio unweighted or A weighted or perhaps DIN (Audio) flat from 22-22kHz?

    Is the power bandwidth (essentially) flat all the way out to 100 kHz or 3dB down at 100kHz?

    Any ideas on what channel separation is at 1KHz, or 10 kHZ, or 20 KHz at rated output or at -3dB?

    How about damping factor (at a given frequency)?

    Phase Shift?

    Rise Time?


    Thanks again!

    Ed

  9. #29
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    Quote Originally Posted by Bradrock View Post
    Just curious; Do you have your boards made here in the states or overseas?
    Boards will be made here in the US.

  10. #30
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    Quote Originally Posted by oldphaser View Post
    Nick,

    Thanks for offering up some specs on your board.

    Is the S/N ratio unweighted or A weighted or perhaps DIN (Audio) flat from 22-22kHz?

    Is the power bandwidth (essentially) flat all the way out to 100 kHz or 3dB down at 100kHz?

    Any ideas on what channel separation is at 1KHz, or 10 kHZ, or 20 KHz at rated output or at -3dB?

    How about damping factor (at a given frequency)?

    Phase Shift?

    Rise Time?


    Thanks again!

    Ed
    Hi Ed,

    - S/N spec is weighted, but I can certainly do un-weighted.

    - The power bandwidth would be -3dB at rated power for the 700. For the 400, the power bandwidth would be a bit better due to less power and more headroom on the slew rate.

    - Channel separation should be as good as the original 400 or 700, but I won't know until I get the boards for testing.

    - I'll have to measure the damping factor and phase shift when I do testing. Rise time and slew rate are interrelated, so the rise time should be better than the original 400 and 700.

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