This is correct I am building a 'tandem' VDG using both positive and
negative polarities. I picked up two of those HV negative ION generators
just because they were so cheap and I can mess around and see what I get.
I though about picking up some flybacks but they don't say anything about
having a built-in diode and I don't think it's easy to remove them. I
didn't see this deal and already ordered the ion generators, maybe I'll
check these out if the ion generators don't work as expected.
Thanks again for all the info it's been very useful.
On Mon, Sep 28, 2015 at 9:03 PM, David Speck <Dave@xxxxxxxxxxxxxxxx> wrote:
> Matt,
>
> I may have missed something. Why do you need both polarities
> simultaneously? Are you running two VDGs simultaneously, one positive and
> one negative?
>
> You could use two separate supplies, one positive, and one negative.
>
> Let's see If I can get this straight. The negative ion generators that I
> mentioned in my last eMail should be ejecting electrons to add them to air
> molecules to make them negative ions. That would suggest that the negative
> ion generator would qualify as your negative voltage supply.
>
> Most of the TV flyback transformers that you can find these days have
> built in high voltage, rapid turnoff diodes suitable for high frequency
> rectification. In a CRT, electrons are expelled from the cathode and are
> attracted to the positively charged front of the CRT, so typical TV flyback
> transformers would make a positive output.
>
> Electronic Goldmine is offering a three piece assortment of flybacks for
> $13. There are lots of simple one or two transistor circuits available on
> the 'net that allow you drive these flybacks. They could provide you with
> the positive HV output you need.
>
> http://www.goldmine-elec-products.com/prodinfo.asp?number=G20801
>
> Dave
>
> On 9/28/2015 7:19 PM, msweeney23@xxxxxxxxx wrote:
>
>> I wish i could but i need both DC polarities :(
>>
>> I know an NST is totally overkill for this but outside of using an old
>> fkyback without the built in diode i dont see many options.
>>
>> Some 20 years ago i built this using a flyback from an old tube TV
>> running on 12DC but it was just a curiosity and i scrapped it when building
>> my first TC (at age 17 with no real knowledge building plate glass
>> capacitors - lucky i didnt kill myself).
>>
>> If i could find a cheap +/- HV DC generator id be happy. Could i use a
>> single polarity and somehow shift it down so i see a +/- half the voltage?
>>
>
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