Re: Ignition coil tesla (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 04 Nov 2007 13:22:52 +0000
From: James Howells <james@xxxxxxxxxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Ignition coil tesla (fwd)

Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Fri, 02 Nov 2007 13:55:12 -0700
> From: Ed Phillips <evp@xxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Ignition coil tesla (fwd)
>
> 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"
>
> 	Sure appears that the drive circuit for the coil primary isn't working.  Have you checked and rechecked the wiring?    
> I don't know what test equipment you have but if you had a scope you could check waveforms through the circuit to see if the 555 timer is oscillating; looks as if it isn't.  What is the voltage to ground from pins 8 and 1 of the 555?  Are you sure the transistor connections are correct?  What voltages to ground do you measure at the base of each of the transistors?  What voltage at their collectors?
>
> Ed
>
> Ed
>
>
>
>
>
>   
SIMON
 I am certain that your driver circuit is not working
Please check your spam box for off list e-mails I have sent you so you 
can check the circuit with a speaker or peizo electric sounder
Also for a much simpler driver circuit I have sent you
I strongly recommend you look at the 
http://www.rmcybernetics.com/projects/DIY_Devices/homemade_tesla_coil.htm
for information
A good ignition coil driver is at rftechnologies.org   High  Voltage 
Coil Driver
Or or just Google  Ignition coil drivers - you will see lots there some 
with only one transistor and some with more to increase the current 
handling.

Prior to attaching your TESLA circuit the Ignition coil should be giving 
a spark of  5 - 25 mm long
Take the INSULATED ( original cable) from the HV centre connection and 
spark down to one of the primary + or _ connections

If there is no spark there then the driver or the coil is not working
If you connect a speaker or piezo electric sounder to the last 
transistor base and ground you should get a squeal if the driver is working
(  if you have one, use a 50 ohm speaker - if you only have a 8 ohm one 
you may need to put a 5- 500 ohm resister in the line)

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