Joule Thief

[IotaYodi]

i want to know where to put prope tip and aligator clip ?

The alligator clip goes on the negative or ground when checking a circuit.
On my scope I dont need the alligator clip hooked up when calibrating the probe.
You do need to have all the scope settings right to adjust the probe using the prb adj (probe adjust) connector on the scope. If you give the make and model someone can help you with  it faster.
If you have a perfect square wave using the probe adjust connection with no rounded corners or spikes, then the probe is set correctly. 

[crowclaw]

Is your secondary output 'free floating' or is one side grounded? if one side is grounded to the rest of the circuit then you crock clip shares the same grounding point. However if the secondary winding is not connected to  ground, then  your probe will be connected to one secondary output wire and the crock clip then goes to the other, effectively the scope is connected across the secondary output. If you are lighting a neon you will likely have to switch your probe to divide by 10 otherwise the scope Y amplifier may overload.

[freepow]

  I have a very important question for anyone who can help me...
I have a Joule thief with bifilar and a secondary wound on the toroid, The secondary is just wound on the toroid but is not connected to the circuit.
I can light up only one NEON on this secondary, but i have measured the AC volts on my 10 MHZ scope and there is three ways i have tested this...

First way is - probe tip connected to one side of secondary and the aligator clip not connected and i measure 52 AC volts.

Second way is - probe tip connected to one side of secondary and aligator clip to other side of secondary and i measure 210 AC volts.

Third way is - probe connected to one side of secondary and the aligator clip to negative on battery in joule thief and i measure 74 AC volts.

Which is the correct connecting procedure with probe tip and aligator clip ?? Remember i can only light one NEON only with this secondary coil !

PLease help me, thankyou.

[resonanceman]

I have a very important question for anyone who can help me...
I have a Joule thief with bifilar and a secondary wound on the toroid, The secondary is just wound on the toroid but is not connected to the circuit.
I can light up only one NEON on this secondary, but i have measured the AC volts on my 10 MHZ scope and there is three ways i have tested this...

First way is - probe tip connected to one side of secondary and the aligator clip not connected and i measure 52 AC volts.

Second way is - probe tip connected to one side of secondary and aligator clip to other side of secondary and i measure 210 AC volts.

Third way is - probe connected to one side of secondary and the aligator clip to negative on battery in joule thief and i measure 74 AC volts.

Which is the correct connecting procedure with probe tip and aligator clip ?? Remember i can only light one NEON only with this secondary coil !

PLease help me, thankyou.

Freepow
The second way  is  correct
With  210V AC  you  should  be able to light 2 neons in series .
I am guessing you  do not  have enough power to do that.
Try  connecting  the   leads  same  as  the second way ......except  add the  neon 
I think  you  will find that  your operating  voltage is  over 90 V but   probably less than 150 V
I say that  just because   it takes  about 90 V to light  one  neon .....  much over   150  and you  got a  good chance of  lighting 2l


gary

[freepow]

Hi, thanks for reply,  i measured 88 AC volts when i connected NEON, but it says about 140-150 AC volts without, do you measure AV volts with Neon connected or without

Because without NEON it says 140-150v  but it will only light one Neon, so whats the correct way??

Oh to calibrate probe-do you connect probe tip to probe test and aligator to what ??