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Thread: First attempt of TD Class on Leco Amplifier Module

  1. #1
    Moderator DjLeco's Avatar
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    First attempt of TD Class on Leco Amplifier Module

    After studying and studying, Yamaha and Labgruppen TD amplifiers schematics, I decided to give a try to implementate something on mine AB class amplifier.

    So I go to the Yamaha's Eee schematics (autooscilant) and extracted what I need for implementation to see if it works.

    Yamaha uses on each rail +Vcc and -Vcc ,3 pairs of transistors in voltage amplifier (2SA1492A +2SC3856A) ,I used just one pair of MJL21195+MJL21196 , and 3 pairs of mosfets in current amplifier (2SK3004), I used one pair of IXTQ52N30P (very fast and small gate charge mosfet)in tests.

    Officially Yamaha's use +/- 155Vcc in idle and in load, the supply falls down till around +/- 110Vdc, they use a very small power supply SMPS, but that's not important.

    After tests and tests , starting from +/- 110Vdc, I pushed far to +/- 170Vcc in idle(+/- 165Vcc in full load), because mine SMPS is with PFC, and drops just 10 Volts (+5 -5 on each rail) from idle to full load, and I have obtained what U can see in the movies.

    Don't laugh about "spider" connection of SMPS and TD part, just take couple minutes of your life and watch the small movies on youtube.

    Comments are very appreciated and welcomed, expecially about output power!

    Next week I will give a try, to implement modulate TD like Labgruppen, at 250Khz and 500Khz too, because on autooscilant Yahana TD Design, I hear sounds in colis, and gives small switching artefacts, more visible at 1000Hz.

    I obtained 109-110Vrms on 4 ohm dummy load, and trying into clip, smps has shut down (I have calibrate protection to act at around 3400-3500W)














  2. #2
    hello sir can u share with me ur schematic diagram?thank you

  3. #3
    Moderator DjLeco's Avatar
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    Hi, sorry that was an experiment, no final schematic developed.

  4. #4
    hello sir can u share with me ur schematic diagram?thank you

  5. #5
    Moderator DjLeco's Avatar
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    Hello, no, the schematic not definitive.

  6. #6
    diysmps Senior Member
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    okay . what about pcb layout . can your amp support hard driving at 2ohms??

  7. #7
    LECO WONT share anything everyday i chat with him
    Andrew Lebon

  8. #8
    diysmps Senior Member
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    that is sad dj leco . i wonder between class d, ab , h ,hd or td what are advantages and which one is clearer and cost effective than the rest .
    if the amp is used for pa

    below images class td lab gruppen in fp 10,000 uses 12outputs per channel and is very stable at 2ohms wattage at 2 ohms is 2500watts

    FP10000Q_05.jpgFP10000Q_ 1 2.jpgFP10000Q_ 10.jpgFP10000Q_05.jpgFP10000Q_ 1 2.jpgFP10000Q_ 10.jpglabgruppen-fp3400-power-amplifier-service-manual.pdfFPplus-Series_Technical_Data_Sheet_TDS-FP10000Q_V9.pdf

  9. #9
    Moderator DjLeco's Avatar
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    As long as the project was just for testing, the schematic isn't complete and will never be.

    Class AB+B is most clearer for PRO application, then follows ClassG , after is ClassH 2, 3 or 4 step, then TD class, last ones are classI and classD switching power amplifier.

  10. #10
    diysmps Member
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    class td sunfire amplifier whats the different to me the same
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