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Posts posted by radha

  1. Hi kevin,

    I did some calculations and found out that the capacitor values are unpracticably high ( ~ 3000uF ). For less C, the current also will be low ( as you rightly said ). So I am leaving the idea of using the Crockcroft-Walton circuit. I think that the MOT idea will be better, as suggusted by Alun.

  2. I did some reading and found out the following :

    Microwave Oven Transformers ( MOT ) are for generating high DC voltages to power the magnetron. It is the magnetron which produces the RF. So this answers some of my own doubts my previous post. So I cannot use the MOT for RF generatation. ( correct ? ).

    Here is a circuit of the Crokcroft-Walton circuit for the generation of high DC voltages.


  3. Thanks for all the inputs.

    My project is to make a RF source to deliver about 800-1000W. By RF I mean Very Low Frequency RF ( around 15MHz ). Is this frequency harmful ?

    So my original idea was this : make a DC power source for 1KV,1A. Use this to power a RF amplifier.

    Will the microwave transformer work at this frequency ( 15MHz )? If it does, my work will be greatly simplified. I can skip the power supply part.

    The idea of using the microwave oven transformer for the DC power supply section is good. I will look into it. Thanks for the idea.

  4. Hi Ante & Audioguru,

    Thanks for the reply :).

    I think I'll scale down the specs to 1000V, 1A. This is the power supply for a RF amplifier as Ante rightly guessed. I require it for RF plasma research.

    Crockroft-Walton circuit is a standard circuit to generate HV DC ( >300kV ). I know that it can generate this voltage in 2 or 3 stages, but I want to be sure of the current. If this do not work out, then I'll look at the convertor-invertor-convertor scheme.

    Right now I don't have a jpg/gif of the circuit. I'll post it as soon as I can get one.

    I have limited experience of HV, and this is the first time I am doing this. Yeah, and I'm a little wary of the high power involved ! :o

  5. Hi to all, this is a great site and I am happy to be here ! ;D

    I am planning to make a high voltage DC power supply ( 2KV, 1.5A) by using Crockroft-Walton circuit. I have some questions on this :

    (i) Will this circuit give this much DC current ?

    (ii) What capacitors should I use ? I plan to use high voltage ceramic capacitors . Is this OK ? ( input is 230V, 50Hz )

    (iii) Is the VAR rating of the capacitors dependent on the o/p current drawn ?

    (iv) What should be the capacitance value ? Low or high ?

    Replies will be highly appreciated. Thanks in advance.

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