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Thread: LCD Backlight Upgrade

  1. #541
    MySQL Error Scouse Monkey's Avatar
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    hmmm it's been a fair few years since i looked at a Maxim datasheet. the 669 looks to be the only option.

  2. #542
    Constant Bitrate
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    How about a 12 volt floating/isolated supply in series?

  3. #543
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by davesaudio2
    How about a 12 volt floating/isolated supply in series?
    no idea. i'm not an EE. please explain more.

  4. #544
    Variable Bitrate numbers's Avatar
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    What inverter is it that will power 8 but not 10 tubes? Is that due to power limitations or not enough outputs? As long as it can supply enough power it shouldn't be very hard to add two outputs.

  5. #545
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    Paralell

    What about 2 inverters in paralell?

  6. #546
    MySQL Error jcdillin's Avatar
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    Quote Originally Posted by numbers
    What inverter is it that will power 8 but not 10 tubes? Is that due to power limitations or not enough outputs? As long as it can supply enough power it shouldn't be very hard to add two outputs.

    actually it's very hard to add two outputs, I already have a very high output inverter, unless the transformer is wound for it, hooking up two tubes just makes it go crazy.
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  7. #547
    MySQL Error jcdillin's Avatar
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    hey Scouse, I already have a regulator that will do a boost from 8 to 15v up to 24V at up to 10 amps. The LM3478 fits the bill perfectly
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  8. #548
    Variable Bitrate numbers's Avatar
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    Well sure it's hard if you don't do it right. You can't just split an output and run multiple tubes off of it. You have to add the circuitry as well, and that circuitry amounts to one whole capacitor. Quite simple. Grab an inverter and look at the output. In the vast majority of all cases, you'll find that one lead goes straight to the transformer. The other lead has a capacitor bridging it to the transformer. If the inverter you are looking at has multiple outputs, you'll see that all the outputs are that way. All you have to do is add the appropriate capacitor to the same place the other ones are and you've got another output. The primary function of that capacitor is to allow a brief moment of startup voltage, then afterwards allow a limited flow to the tube. This is why you can't add a tube to the same capacitor, and also why you must select the capacitor based on the tube.

  9. #549
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    Quote Originally Posted by numbers
    What inverter is it that will power 8 but not 10 tubes? Is that due to power limitations or not enough outputs? As long as it can supply enough power it shouldn't be very hard to add two outputs.
    I am not working on CCFLs. JCD is working on the CCFLs.

  10. #550
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    Quote Originally Posted by hammerboy
    What about 2 inverters in paralell?
    Problem with running two inverters in parrallel as we have tried is you get interference if they are not in phase. You have to build a closed loop system to get them in phase which requires special inverters. Also, two inverters are harder to build into the screens than 1.

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