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Thread: Group Buy 2KW Class-H Amplifier

  1. #21
    how is possible o/p 2kw with only 6 pair of transistors with single pcb ? please explain If don't mind.
    Thanks

  2. #22
    What is size of heat sink

  3. #23
    Quote Originally Posted by mkubawat View Post
    how is possible o/p 2kw with only 6 pair of transistors with single pcb ? please explain If don't mind.
    Thanks
    Yes 2000W is not a Joke, But I got 1800W @ 2 Ohms since my transformer is 40-0-40 x2

    If you rais voltage to 55-0-55 x2 you will get 2KW for sure.

    Whats the relation between single sidded PCB and 2KW?

    12 Transistors are good for 1800W amplifier but HEAT also is a lot at 1800W, Heat sink is 37CM x12 CM *in my application*

    Thanks

  4. #24
    And What about output stage? Can you tell me which transistors are there?
    http://zosilnovaace.eu/
    Power Amplifiers

  5. #25

    Output devices

    Quote Originally Posted by JAKUB_G View Post
    And What about output stage? Can you tell me which transistors are there?

    @ Jakub_G, transistors used is 2SA1943 and 2SC5200, Also you can use other transistors like MJL21196, MJL21194, but compensation is required when you change output devices

  6. #26
    Just six pairs of output transistors for 2kW? That must be some kind of joke. If you use efficient transistors like MJL21195/96 six pairs is not enough too. Can you calculate the current which flows over one transistor in full power into 2 ohms? Output devices are surely out of SOA....
    http://zosilnovaace.eu/
    Power Amplifiers

  7. #27
    @ Jakub_G
    I also agree with you..............

  8. #28
    diysmps Member
    Join Date
    Jan 2011
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    SF & Las Vegas - USA
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    The 1800 Watts is impossible with a 40-0-40 toroid or even 50-0-50. This amp is H class. it requires at least +120 +80 -0- -80 -120 .... +high +low grnd -low -high

    This amp also requires a control board and a pre-amp with housekeeping circuits and ALSO a Input board and Power Supply board

    Minimum power 85-50-0-50-85 per board.

    WITH dual high-low power you get enough current to increase output to at least 1.5K - but nothing matters without a control pcb AND pre-amp pcb

  9. #29
    diysmps Member
    Join Date
    Jan 2011
    Location
    SF & Las Vegas - USA
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    Quote Originally Posted by AutoclassA View Post
    @ Jakub_G, transistors used is 2SA1943 and 2SC5200, Also you can use other transistors like MJL21196, MJL21194, but compensation is required when you change output devices
    This is opposite of required I think.

  10. #30
    Quote Originally Posted by silverprl1 View Post
    The 1800 Watts is impossible with a 40-0-40 toroid or even 50-0-50. This amp is H class. it requires at least +120 +80 -0- -80 -120 .... +high +low grnd -low -high

    This amp also requires a control board and a pre-amp with housekeeping circuits and ALSO a Input board and Power Supply board

    Minimum power 85-50-0-50-85 per board.

    WITH dual high-low power you get enough current to increase output to at least 1.5K - but nothing matters without a control pcb AND pre-amp pcb
    ooops, I am sorry I was talking not rectified, AC!!

    I had 53V RMS at 2 Ohms from that transformer witch is

    +120 -0- -120 +60 -0- -60

    Also you are free to buy a PCB or not!

    This is an amplifier for audio

    Thanks
    Last edited by AutoclassA; 02-25-2011 at 02:56 PM.

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