Replying to both last replies here. If i could chain two (output isolated) rectified flybacks could i not do the same for two isolated negative ion generators?
Most wallwart xformers have no ground does that mean i can assume an isolated DC output or maybe measure resistance/capacitance of output to each AC prong to see? (I know these are not well regulated and the voltage may drift).
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----- Reply message -----
From: "Carl Noggle" <cn8@xxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: [TCML] Voltage/power dissapation drop across HV DC current limiting resistors.
Date: Wed, Sep 30, 2015 9:53 AM
A nonrectified flyback would make a good power supply for a hairy
Cockroft-Walton. If you do hose the diodes, you will lose about 20% of
the output voltage due to the increased capacitance in the secondary.
Usually the secondary is divided into four parts with the diodes between
them in a big series string.
---Carl
On 9/30/2015 4:26 AM, Atomic wrote:
> I'm not sure why you don't want the rectified flybacks. You could just
> power two of them from (separate) batteries or isolated PSUs and then
> series the HV output, grounding the center tap. Then you'd have a positive
> and a negative high voltage, low current output. I'd use a 555 oscillator
> as opposed to a ZVS for to power them for this purpose.
>
> On Wed, Sep 30, 2015 at 3:58 AM, Carl Noggle <cn8@xxxxxxx> wrote:
>
>> Hey--I forgot to mention that there are four fectifiers in each unit.
>> Most units have had the fectifiers replaced with rectifiers. Best not to do
>> tech writing too late at noght.
>>
>>
>>
>>
>>
>>
>> On 9/29/2015 4:53 PM, Doug wrote:
>>
>>> Hi Mat; I have 2 flybacks but do not know how to identify weather they
>>> are old style or newer style, I have had them for a long time.
>>> Doug
>>>
>>> On 9/29/2015 7:01 PM, David Speck wrote:
>>>
>>>> Matt,
>>>>
>>>> The large majority of potted flyback transformers available these days
>>>> have integral rectifiers built in, because they were intended for use on
>>>> CRTs. If they have a long lead with a round anode cap on it, it's safe to
>>>> assume that it has a rectifier in it.
>>>>
>>>> It's quite hard to find flybacks without rectifiers in them these days,
>>>> unless you can find very old ones from tube TV sets. Those sets used
>>>> vacuum tube 1B3 rectifier tubes, 'cause effective solid state rectifiers
>>>> weren't available at the time.
>>>>
>>>> The old flybacks without rectifiers tend to command high prices when you
>>>> can find them on eBay.
>>>>
>>>> Removing the rectifiers from an epoxy potted flyback without destroying
>>>> the hair-fine end of the HV winding is a very difficult proposition.
>>>>
>>>> Dave
>>>>
>>>> On 9/28/2015 11:19 PM, Matthew Sweeney wrote:
>>>>
>>>>> 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.
>>>>>
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