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Type: Posts; User: DjLeco

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  1. Replies
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    I like your signature, Microsim!

    I like your signature, Microsim!
  2. Replies
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    3,802

    Sure, tested but not movie done...:)

    Sure, tested but not movie done...:)
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    3,802

    Points of measure DC rails...

    Points of measure DC rails
    https://s19.postimg.org/g6slmypqn/Yamaha_and_Vcc_rails_pin_test.jpg

    New DC rals of +/-155Vdc (+/- 165Vdc at 232Vac) ...
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    3,802

    Increased secondary storage capacitors...

    Increased secondary storage capacitors
    https://s19.postimg.org/64dtk8atr/DSCN3792.jpg


    Point where measured mains supply in idle mode...
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    Mounted back amplifier...

    Mounted back amplifier
    https://s19.postimg.org/4uberfrnz/Yamaha_Mod_4.jpg


    Replaced trannies with better and powerfull ones
    https://s19.postimg.org/qxbmuwdzj/DSCN3783.jpg
    ...
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    Another Yamaha P7000S modified by me

    I remember the time when mine rack contains 2 Crown 5000VZ, and was more than 80 Kilos...

    I have made some Leco Amplifiers with SMPS, not so powerfull but much lighter, but I sold all because...
  7. As long as the project was just for testing, the...

    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,...
  8. Hello, no, the schematic not definitive.

    Hello, no, the schematic not definitive.
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    Leco V2 mini, Hi-Fi home amplifier

    Even if I'm more to big power amps, I decided to make also something smaller around 200Watts/8 ohms amplifier for "home use" Hi Fi.
    It was developed from Leco V2 amplifier, with less output trannies...
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    3,585

    Thank you, any questions are welcomed!

    Thank you, any questions are welcomed!
  11. Replies
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    3,585

    Some heavy tests, before closing it and prepare...

    Some heavy tests, before closing it and prepare it to sell.


    8 ohms bridged:



    https://www.youtube.com/watch?v=5KEMXYr3voQ&feature=youtu.be
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    http://s2.postimg.org/5up33al8l/DSCN2344.jpg...

    http://s2.postimg.org/5up33al8l/DSCN2344.jpg

    http://s2.postimg.org/objhu416t/DSCN2349.jpg

    http://s2.postimg.org/dm5t1updx/DSCN2350.jpg
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    Mine Leco version 3 amplifier (Leco V3)

    I worked alot to build this one (just 10 modules made), is all in one amplifier ClassAB+B, (initially it was one ClassH prototype but I quit on that and keep AB+B class).
    Each module contains...
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    Some measurements? Sinewave at 100Hz 2 volts...

    Some measurements?

    Sinewave at 100Hz 2 volts under clipping and rectangular at 10kHz, the same, on 8 ohms dummy load?

    Thank you!

    Nice work!
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    12,352

    Worth a try! But better is to use half bridge...

    Worth a try!

    But better is to use half bridge dedicate driver...
  16. Replies
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    12,352

    Maybe zenner diodes put reverted?

    Maybe zenner diodes put reverted?
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    If goos semiconductors are used, great results...

    If goos semiconductors are used, great results can be achieved, keeping AB class sound.

    Me too, tested

    https://www.youtube.com/watch?v=guoLw9e4Seg
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    13,554

    Yes, it had protection for shorted output, but as...

    Yes, it had protection for shorted output, but as I told, project is obsolete.
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    This project is OBSOLETE.

    This project is OBSOLETE.
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    3,704

    Class AB passing to B when temp increases over 65...

    Class AB passing to B when temp increases over 65 celcius degrees...
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    Thanks. Welcomed any questions!

    Thanks.

    Welcomed any questions!
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    3,704

    Another Leco V2 complete amplifier

    Down is another Leco V2 complete amplifier.

    Featured protections:


    Thermal (SMPS and audio stages , shortcircuit on outputs, delayed speakers connection, DC out, IOC anticlipping limiter,...
  23. Hi, sorry that was an experiment, no final...

    Hi, sorry that was an experiment, no final schematic developed.
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    Labgruppen LAB4000 TD class amplifo

    I have repaired today one Labgruppen LAB4000 amplifier, TD class amplifier.


    Is supplied at +/- 155Vdc, and the trouble was in low frequency classB part amplifier.

    I have replaced all 10...
  25. Thank you, the project is available for sale,...

    Thank you, the project is available for sale, gerber files, schematics, all rights, etc.
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