High Voltage V Regulator?

Discussion in 'General Electronics Chat' started by Cburg, Jul 12, 2012.

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  1. Cburg

    Thread Starter New Member

    May 16, 2012
    Dear Group,

    I need to regulate (lower) ~340V DC to ~10V DC for supply voltage to an opto driver to gate an SCR. The best three terminal regulator I can find is the TL783 which will work to 125V DC. It shows a circuit for increasing the voltage to 200V (see attachment)
    The transistor is rated for 400V, so could this circuit be used at 340V?
    I was thinking of using an MJE5742G (2x Hfe). Would it work the same?
    Should I lower the zener voltage (it is now very close to the regulator max V)?
    I would use a lower R2 for 10V.
    Is there an easier way to do this?

    Thanks so much!
  2. SgtWookie


    Jul 17, 2007
    Since you didn't provide a schematic, I looked up your other threads - and discovered that you are still referring to a circuit that we do not permit to be discussed on this forum in accordance with the Terms of Service paragraph 6, which reads:

    The topic you wish to discuss is not welcome on these Forums, as it is inherently unsafe, and I urge you to discontinue your attempts on that project; it is likely to cause you severe injuries or death.
  3. Wendy


    Mar 24, 2008
    This happens with depressing regularity. If you insist on making a tranformerless power supply please take it elsewhere, otherwise provide complete schematics.

    Also, word is a lousy graphics program and a great virus vector. Please use .gif or .png files instead.

    I am closing this thread because of the rules violation.
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