Re: Ignition coil tesla (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 02 Nov 2007 18:53:57 -0800
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Ignition coil tesla (fwd)

Hi Simon,

I'm not too familiar with these particular little TC's, but is the spark 
gap firing? This would indicate Q3 and Q4 are performing their function. 
Don't connect the meter across the secondary, that just loads it down 
and indicates nothing of relevance. Simply look for the top of the 
secondary sparking to the ground rod. If you need to, bring the ground 
rod closer to the top terminal. The value of the primary cap appears not 
in resonance with the secondary (which is the id of a tesla coil). Maybe 
you can explain your mmc setup and how you arrived at 1500pF (0.0015uF)? 
If the gap is sparking, then it's just a matter of resonance. 1500pF (if 
that is what it really is), would need about 18.5 turns. Or with the 
existing 12 turns, then adjust the MMC for 0.0025uF (2500pF). That 
should get you near resonance (if resonance is the problem). If the gaps 
not sparking, then the problem lies in the trigger circuit of course.

Take care,
Bart

Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Fri, 02 Nov 2007 19:36:25 +0000
> From: Simon Dodd <Simon@xxxxxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Ignition coil tesla
>
> Thanks,
>
> I am not getting any sparks from my secondary with or without the capacitors
> connected. I am only getting 17 volts across the secondary coil and ground,
> which is the same as the positive terminal of the primary.
>
> Thanks for your help so far
>
>
> On 1/11/07 1:57 pm, "Tesla list" <tesla@xxxxxxxxxx> wrote:
>
>   
>> ---------- Forwarded message ----------
>> Date: Wed, 31 Oct 2007 16:50:32 -0700
>> From: Ed Phillips <evp@xxxxxxxxxxx>
>> To: Tesla list <tesla@xxxxxxxxxx>
>> Subject: Re: Ignition coil tesla (fwd)
>>
>> Hi guys,
>>
>> I am new to this tesla building fun and have just finished construction my
>> first coil.  However I have a problem.  I am using an ignition coil to drive
>> the MMC and coil but I cant seem to get it to work properly.  The voltage is
>> not stepping up at all from the input voltage. This is the coil I have built
>> and everything looks fine from what I can see apart from the HV section.  My
>> ignition coil only has one terminal on the output so I cannot connect it
>> across the power supply in series with the MMC array.  Could someone please
>> help me I am desperate to get sparking!
>>
>> http://www.uoguelph.ca/~antoon/circ/hv/ss-tesla/ss-tesla.html
>>
>> Thanks for your help in advance
>>
>> Simon"
>>
>> Do you get sparks on the secondary of the transformer without the capacitor
>> connected?  Note that your capacitor really is connected in parallel with the
>> primary via your C3.  I've used a similar setup to drive a coil with 0.0047
>> ufd as the primary capacitor and found it dropped the transformer voltage down
>> a lot but it would still jump a short gap [~3/32" as I recall] and I did get
>> 4" streamers from it.
>>
>> What is the spacing of your gap?  The idea of using a small wire for one side
>> isn't right, not sure where it came from.
>>
>> By the way, Tesla never lit any lamps at 25 miles.  Pure popular myth.
>> According to his Colorado Springs Notes he did light a "small" lamp connected
>> to a coil in a field a short distance [200'?]from his primary.  He did light
>> more lamps than that when the coil was in the middle of the primary.  Normal
>> coupling [inductive and/or capacitive] would produce those results.
>>
>>
>>
>>     
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