Need tesla related help

[magnetman12003]

In the below video is shown a very simple pancake coil circuit. Its biggest problem is the huge 5 watt power resister Is there a way or another NPN transistor I can use and get away from using the 5 watt resistor?

https://www.youtube.com/watch?v=4UmVLfFNx7U

[boguslaw]

If you think you can get rid of power lost in resistor and get OU device, you are wrong. Just search for over oscillators like slayer, katcher and adapt

[Ufopolitics]

In the below video is shown a very simple pancake coil circuit. Its biggest problem is the huge 5 watt power resister Is there a way or another NPN transistor I can use and get away from using the 5 watt resistor?


https://www.youtube.com/watch?v=4UmVLfFNx7U

Hello,

You could try winding a Secondary Coil, much finer wire (do the conversion math, gauge/#turns=resistance), equivalent (more-less) to 470 Ohms, then use a core as a heat sink plus at the same token, it would provide a Secondary Magnetic Field to primary when positioned properly in Space...

This way you will have the required resistance plus using the energy to add a secondary magnetic field...make sure you wind the secondary exactly as primary, so, in space the magnetic fields add up and not cancel each others.

As a second option, (a bit more complex, but better) you could wind two secondary coils instead of one...then connect them in series...one following one pancake wind, the second ...to the second pancake (opposite input), etc. This way you will have Two Magnetic Fields identical as Primary...with just one secondary coil you can't have that option. And since you are connecting them in series, then is half ohms (235 each)


Regards


Ufopolitics

[bistander]

Coil equation

You could try winding a Secondary Coil, much finer wire (do the conversion math, gauge/#turns=resistance), equivalent (more-less) to 470 Ohms, ...

Hi Ufo,

I've done a lot of work with coils and have never come across that relationship. "gauge/#turns=resistance"
Could you please elaborate? Is resistance in Ohms and gauge in AWG# wire size?

This is just a simple request and I'll not comment further as not to sidetrack this thread.

Thanks in advance,

bi

[dragon]

In the below video is shown a very simple pancake coil circuit. Its biggest problem is the huge 5 watt power resister Is there a way or another NPN transistor I can use and get away from using the 5 watt resistor?


https://www.youtube.com/watch?v=4UmVLfFNx7U

Since your simply triggering the base of the transistor there is no reason for massive current to flow there - you might replace the high power resistors with a cap in parallel with a standard 1/4watt resistor. I would start with a .1 uf cap and adjust as necessary for performance. If you know the frequency of the circuit you can adjust the resistance of the cap Xc = 1/ (2pi x F x C ) and use a high value resistor to aid in the initial start up.

[Ernst]

Dragon already said most there is to say.
A few minor additions:
The maximum current that you expect to flow through the resistor when using 12V = 12/470 = 26 mA. At 12 V that represents 12V x 26 mA = 0.31 Watt.
So I think a 5W resistor is a bit overkill, 1W would do, and probably 0.5 W would work as well.
So the easiest way to get rid of that resistor is to replace it with a 0.5 W version.

You could also try different values:

With 470 Ohm you will have 26 mA through the base, with an amplification factor of about 40 that will give you roughly 1A (26 mA x 40) through your coil.

With 1000 Ohm you'll have 12 mA through the base, giving roughly 0.5 A through your coil.

The coil has some impedance which will limit the maximum current at a given frequency. So what I would do is try to find that maximum and then adjust the resistors accordingly. Take a handful of 1K5 (1/4W) resistors, start with one and add them one by one in parallel until it makes no more difference.


Ernst.

[Ufopolitics]

@Bistander

Hi Ufo,

I've done a lot of work with coils and have never come across that relationship. "gauge/#turns=resistance"
Could you please elaborate? Is resistance in Ohms and gauge in AWG# wire size?

This is just a simple request and I'll not comment further as not to sidetrack this thread.

Thanks in advance,

bi

Bistander,

The basic Gauge/Resistance Charts are based on linear length/gauge (given in either awg or mm) equals resistance (Length(L)=Resistance(R), And from there anyone could do the math by using either Area (for square/rectangular cores/shape) or Diameter to calculate circumference (length) for cylindrical cores...

Particularly it is not simple to measure long threads of wire when winding large coils for either motors or generators...unless you have a spool to spool transfer tool, with a counter...I don't.


Cheers


Ufopolitics