LiPos can be very tender - I would not use them where there is any danger of
arcing or overvoltage.
Google " lipo battery fire " turns up some fun youtube videos... Granted,
there is a lot of blatant abuse in most of them but they do not like
overvoltage or current...
Dave
> -----Original Message-----
> From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of
> msweeney23@xxxxxxxxx
> Sent: Sunday, October 04, 2015 15:41
> To: Tesla Coil Mailing List; Allen Bishop
> Subject: Re: [TCML] Ion generator + VDG eats my power supply
>
> 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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