I have some lithium ion batteries from a helicopter. Ill try those.
----- Reply message -----
From: "evp" <evp@xxxxxxxxxxx>
To: "Allen Bishop" <co60bishop@xxxxxxx>, "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: [TCML] Ion generator + VDG eats my power supply
Date: Sun, Oct 4, 2015 5:18 PM
Good idea and even AAA's should last forever if not shorted. A 9V
transistor radio battery might work even better.
Ed
On 10/4/2015 1:23 PM, Allen Bishop via Tesla wrote:
> Have you considered using three 1.5 volt AA, C, or D batteries? A lithium 3.6 volt battery usually has about 4.2 volts when fully charged. I would put the batteries in a protective box in case they blow up. ;-)
>
> Allen B
>
>
>
> -----Original Message-----
> From: msweeney23 <msweeney23@xxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Sun, Oct 4, 2015 1:23 pm
> Subject: Re: [TCML] Ion generator + VDG eats my power supply
>
>
> The main NPN transistor on the voltage control board tested like a regular .6
> volt rdiode from base to collector and emitter. I think thats enough to claim it
> is still functional but i would welcome any other suggestions.
>
> The nasty
> lingering burnt plastic smell comes directly from the quad op amp so im assuming
> its totally destroyed. Now to find a replacement here in minnesota. We seem to
> have a lack of old school electronics shops now such a shame.
> :(
>
> Matt
>
>
> Sent from my HTC
>
> ----- Reply message -----
> From:
> "msweeney23@xxxxxxxxx" <msweeney23@xxxxxxxxx>
> To: "Tesla Coil Mailing List"
> <tesla@xxxxxxxxxx>
> Subject: [TCML] Ion generator + VDG eats my power
> supply
> Date: Sun, Oct 4, 2015 1:56 PM
>
> It appears the HA17324a quad op amp
> fried. The Vn(+)2 input pin actually melted right off the IC. I assume that
> would be an overcurrent situation, possibly caused by some other component
> failing.
>
> I dont see any other obvious damage except for the op amp, but ill
> test what i can to be sure.
>
> I have education in radio and video electronic
> engineering but this topic was never discussed. And that was twenty years ago :)
> (we were still fixing CRTs).
>
>
>
>
> ----- Reply message -----
> From: "Jim Lux"
> <jimlux@xxxxxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Subject: [TCML] Ion generator +
> VDG eats my power supply
> Date: Sun, Oct 4, 2015 1:29 PM
>
> On 10/3/15 9:20 PM,
> msweeney23@xxxxxxxxx wrote:
>> I purchased a few cheapo 12VDC/15KV negative ion
> generators and set one up with my VDG.
>> I was using an expensive 30 amp lab
> grade power supply set to 4VDC. I grounded the case of the power supply and used
> the +/- of the ion generator to produce corona from the lower brush.
>> It
> worked amazing ive never seen that power output before, very thick loud sparks
> 10 inches for a few seconds then smoke from the power supply :(
>> Can ayone
> explain why this might have occured? I just wasted a $200 variable supply and
> not entirely sure how to go about fixing it (it still outputs 12VDC but no
> longer variable).
> That nice snappy spark is a very fast rise time high
> current pulse, and
> will induce remarkably high voltages in a victim loop. It's
> all about
> di/dt, and the area of the loop.
>
> More than one person on this
> list has killed their power supply driving
> a voltage multiplier or Marx
> system. The typical scenario has a 20kV or
> so multiplier running off a
> switcher feeding a Marx with half a dozen or
> more stages. The 12V power is a
> couple of clip leads or similar laying
> on the bench feeding the switcher, and
> separated by a few inches.
> The Marx goes "bang", the power supply
> fails.
>
> Another scenario is that there's a "ground bounce" when the system
>
> fires, and that pushes the power supply output way out of the common
> mode
> range for some component.
>
> Your power supply may not tolerate several hundred
> volt spikes coming
> back from the load very well. If it has current and
> voltage limiting,
> there's some sort of error amplifiers across a measuring
> resistor. Those
> amplifiers often have a "not very many volts" common mode
> limit
> (particularly in the negative direction). An unexpected 100V transient
>
> fries the current error amplifier which is usually measuring the voltage
>
> drop across a small resistor in series with the output.
>
>
>
>
>> I wish i
> had a video to share, but it all happened to fast. I think its something to do
> with grounding the case.
>> Thanks!
>>
>> Matt
>>
>>
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