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    #21
    Re: 555 pwm

    Originally posted by capwizard View Post
    1) I was there praying with analog input so, I crank It Up to almost 18 volts.

    2) yes, 4I always use DC input.
    So you were using the 555 on the Analog Dimming instead of the PWM.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

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      #22
      Re: 555 pwm

      1) I used the same power supply for 555 pwm to do analog Input because this power supply doesn't have a voltage display, and the 10 turns potentiometer is really hard to turn.

      2) Pwm - DIM, I think if the voltage drops down to 2 volts will be active.
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        #23
        Re: 555 pwm

        Originally posted by capwizard View Post
        But I thought the output waveforms are 90-degree reverse
        I guess that's right if one is 90 degrees before basis and the other is 90 degrees after basis, but if you look at the block diagram, it necessarily needs to be nonoverlapping, 180 degrees apart from each other, specifically for the half bridge off-line PSUs.

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