EMP fluorescent bulb tester

Hello,

I have made EMP which will light the florescent lamp easily.
My problem with it is. it only works if the wire from rf transistor's collector to one end of coil is longer. if i shorten the wire and my hand touches the battery it wont work. but if i extend the wire even i touch the battery it will work.
i want to know what effect is that. and how can i eliminate that effect. also if i touch the coil it wont work. so how to avoid the body contact problem?

Some help is highly appreciated. Thank you in advance.
Attaching the youtube video here.
https://www.youtube.com/watch?v=yW1iWd2xmBY

Electro Magnetic PULSE .

That aint a pulse, it's CW , AC CW but, CW non the less. Like a mini tesla primary, or ioniser with a coil on the output. I suspect you're not going to get it to do much more thank what it does.

imraneesa said:

i want to know what effect is that... so how to avoid the body contact problem?

Click to expand...

Parasitic inductance and/or parasitic capacitance. Usually if you add yourself into a low voltage circuit, you have no effect because your body passes very little DC current. At high frequency however, you may pass enough current to disrupt the circuit. That's just how capacitive reactance works.

Solution? Don't touch it. Isolate electrical contacts.

By the way, ebay/china already has a similar variety of fluorescent lamp tester for $8, and it comes with a fancy gas sphere.

Your method only tests for vacuum integrity. Lamps need more than vacuum integrity to function. Cathode continuity for example!

Cyparagon said:

Parasitic inductance and/or parasitic capacitance. Usually if you add yourself into a low voltage circuit, you have no effect because your body passes very little DC current. At high frequency however, you may pass enough current to disrupt the circuit. That's just how capacitive reactance works.

Solution? Don't touch it. Isolate electrical contacts.

By the way, ebay/china already has a similar variety of fluorescent lamp tester for $8, and it comes with a fancy gas sphere.

Your method only tests for vacuum integrity. Lamps need more than vacuum integrity to function. Cathode continuity for example!

Click to expand...

Thank you for answers. I tried to wrap all the parts in news paper double layer and my body touch is still affecting it.

Insulate it more thickly so there is far more space between your finger and the item, I think it is probably a capacitive effect. How closely can you put your finger to the item without an effect? What ever that amount of space is, put a shell around it to produce that amount of gap.