Can this High Voltage circuit be improved

Discussion in 'General Electronics Chat' started by TexAvery, Oct 13, 2009.

  1. TexAvery

    Thread Starter Member

    Oct 7, 2009
    58
    0
    Hi again.
    Can this high voltage circuit be improved/simplified.
    This schematic is included with this Scope Clock kit
    I would like to have a final voltage of 3000v
    I am trying to drive a larger CRT that requires more voltage.
    [​IMG]
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    It's not going to work with a DC voltage source. Here is a link to voltage multipliers - http://www.play-hookey.com/ac_theory/ps_v_multipliers.html

    Be careful - the current is limited, but the voltage is dangerous. This circuit must be built with care as to layout and mounting inside an insulated enclosure.
     
  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,170
    395
    AZ- Nucleonics used this multiplier with a 1:3 audio transformer to give 300V AC @ 60 Hz for input for I think about 1.2kV for a neg. ion gen.Measured 10 uA ion current.Caps .1uF @ 400 V, Diodes 1N4007 . What current do you need? The Electronic Goldmine, Cat. # G1783 120 AC = 7.5 kV out, G 16821 high V transformer; G 16565 12V DC = 1000V @ 30 kHz, add doubler or tripler.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    This one:
    http://www.goldmine-elec-products.com/prodinfo.asp?number=G16821
    that Bernard pointed out is likely the most promising. You'd need to build or buy a HV rectifier bridge for the output, and some kind of exciter circuit for the primary side.

    You'd want the tube to have a positive voltage, so that leaves out the 1st one; it's a negative ion generator. The G16565 might work, too.
     
  5. EPhantom

    New Member

    Oct 12, 2009
    5
    0
    THANK YOU!!! I've been wanting to know how those circuits work, I've studied them, asked professors, and I couldn't get anything. THANK YOU.

    P.S. If it isn't already on the "book"? section of the site, why doesn't someone put it in there? Liabilities?
     
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    You'r right Sgt, + side of G1783 prob. tied to neutral via hi val. resistor, negating reversing hv leads.
     
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