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Re: [TCML] [UPDATE] Tesla Coil Computer Interference
Hi Gary,
Glad it helped! I really aught to find out who suggested the ferrite beads... I searched but couldn't find that post. Maybe it was off list... Well a big thanks to whom ever it was!
Brandon
On Sep 10, 2010, at 7:41 PM, Gary Lau <glau1024@xxxxxxxxx> wrote:
> Hi Brandon,
>
> Timely and interesting!
>
> Just today I hooked up a laptop (battery-only power) and USB-connected
> LabJack A/D data acquisition device to a photodiode to sense and average
> (with a LabVIEW program) the light from the dummy load. The USB cable to
> the LabJack was the only cable leaving the laptop. The photodiode and cable
> to the LabJack is about 20" distant from the nearest HV node (the halogen
> lamps), so I figured I was pretty well safe and isolated.
>
> Running the dummy load, after about 5 seconds of correct operation,
> something in the LabJack would lock up. Shutting off the NST and unplugging
> the USB cable rectified the problem, but the next time the gap and dummy
> load ran, the same thing happened again.
>
> The cable between the photodiode and LabJack is #22 stranded twisted pair,
> about 3 feet long. I found a ferrite toroid (1 1/8" x 5/8") in my stash and
> looped the cable 3 times through the toroid. Problem solved!!! I removed
> the toroid, problem is back. The ferrite toroid definitely fixed it. Good
> stuff! If I hadn't seen this myself, I wouldn't have believed it - thanks
> for posting.
>
> Regards, Gary Lau
> MA, USA
>
> On Fri, Sep 10, 2010 at 5:56 PM, Brandon Hendershot <
> brandonhendershot@xxxxxxxxx> wrote:
>
>> Alright, basically this was my problem; After installing Gary's Primary
>> Coil (Simulator, Emulator, Substitute, Place Holder, etc.), whenever I ran
>> the coil, my computer would start to scream a solid beep tone from the
>> motherboard mounted speaker. Turns out that it would stop after about 30
>> seconds and would act as if nothing ever happened after that.
>> The coil was in no way grounded to green wire ground, nor did I use (or
>> need) an RF ground.
>> The coil runs on 120V/60 hertz (US).
>> 0-140V Variac (Problems arose around 120V anyway)
>> NST is 15kV 30mA.
>> Terry Filter always attached.
>>
>> I bought some ferrite beads off of eBay for cheap, but they were of
>> excellent quality (I'll post specs on those later). I placed 2 on the coils
>> power cord, one at each end, about 1-2 inches from the ends. Same with
>> computer's power cable. The rest (8 total) went to expensive appliances
>> around the room.
>> Now it works fine. No more freaking out the computer!
>>
>> Brandon
>>
>>
>> On Sep 10, 2010, at 4:39 AM, Gary Lau <glau1024@xxxxxxxxx> wrote:
>>
>>> Hi Brandon,
>>>
>>> Could you please remind us exactly what the observed problem was, and
>> where
>>> (on what cable(s)) the ferrite's were placed? It would also be useful to
>>> know the basic specs (power level) of your coil, and what kind of RF
>> ground
>>> arrangement you're using.
>>>
>>> Thanks, Gary Lau
>>> MA, USA
>>>
>>> On Thu, Sep 9, 2010 at 6:31 PM, Brandon Hendershot <
>>> brandonhendershot@xxxxxxxxx> wrote:
>>>
>>>> Hi All,
>>>> Just a heads up for anyone stumbling upon this in hopes to resolve their
>>>> own problems; The ferrite beads fixed it. The snap around beads work
>> great!
>>>> Big thanks to whoever mentioned it!
>>>> Brandon
>>>>
>>>>
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>>
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>>
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