Newman Motor #3 by detrix42

[detrix42]

@ jarado2600:

I tried to build a JT (Joule Thief) circuit with one of the transformers I pulled out of the old power supply.  Having some difficulties.  A large part is due to not really knowing the pin out of the transformer.  I think I have figured it out, but not 100% certain.  One coil has 9.4 ohms, and the other has .4 ohms.  I have to .4 ohms as the primary and the 9.4 ohm as the step up coil.  I am trying to measure the voltage across the 1uF cap, and only getting the supplied voltage.  I put an LED in place of the diode. when measuring voltage across the capacitor, with an analog meter, which just happened to be the one closest to me at the time, the LED lit up a little.  If I short out the capacitor, the LED lites up bright.  What am I missing???  if I have given enough info.

detrix42

[Mk1]

@detrix

Ok first you said something about the resistance of those coil , that gives you two things first the resistance , the coil with the highest should be good for the output (pickup coil) , second thing is continuity , and that is really important , it will tell you the type of coil you have.

Make sure you know witch pin is connects to , one may be connected to more then one pin .

Then isolate two single coil or one with 3 pin to use for the joule thief.

I hope this helps !

Mark

[jadaro2600]

I'll repost the schematic with some part numbers.

The first setup can be made using ceramic disk caps - this will ensure that you're no going over voltage,  It's also quite possible that you're transformer doesn't have a good ratio.

You may be better off winding your own toroid for now.  Also, you must connect the pinout anti-parallel.  See setup 2.  this just means that the windings of one must oppse that of the windings of the other...   if two were co-wound, then you would have to take the beginning of one, opposite beginning of the other ..see the somewhat foolish representation in setup 2.

the resistor directly at the base can be bridged with a cap instead of like in setup 2 ...this MUST be a disk type capacitor or it will blow. ..something too big and it won't work, something too small and it won't work.  try between 1000pF and 1uF.

The capacitor on the right needs to be able to handle the high voltage.

Use a 1.5 volt battery to test - then step up to a 9v source.  All resistance value on the schematic below can be divided by 10 for the 1.5v source.

I will build one of these this weekend to test a 9V source, you may want to get one of those large transistors with a heat sink to be safe though.

I have an NTE210 as well as a number of others, the have a metal fin on top of them, this usually indicates that they can handle a larger base current than the 2n2222 version and not heat up.

[onthecuttingedge2005]

I'll repost the schematic with some part numbers.

The first setup can be made using ceramic disk caps - this will ensure that you're no going over voltage,  It's also quite possible that you're transformer doesn't have a good ratio.

You may be better off winding your own toroid for now.  Also, you must connect the pinout anti-parallel.  See setup 2.  this just means that the windings of one must oppse that of the windings of the other...   if two were co-wound, then you would have to take the beginning of one, opposite beginning of the other ..see the somewhat foolish representation in setup 2.

the resistor directly at the base can be bridged with a cap instead of like in setup 2 ...this MUST be a disk type capacitor or it will blow. ..something too big and it won't work, something too small and it won't work.  try between 1000pF and 1uF.

The capacitor on the right needs to be able to handle the high voltage.

Use a 1.5 volt battery to test - then step up to a 9v source.  All resistance value on the schematic below can be divided by 10 for the 1.5v source.

I will build one of these this weekend to test a 9V source, you may want to get one of those large transistors with a heat sink to be safe though.

I have an NTE210 as well as a number of others, the have a metal fin on top of them, this usually indicates that they can handle a larger base current than the 2n2222 version and not heat up.

but the Joule Thief is not off the grid, it only takes induction from already induced electromagnetism that's already payed for, unless of course your a thief and steal from your neighbors at the same time and or some stray electric pole. 

although you might get induction via high voltage you will not get very much amperage. this is usually always the case, to much voltage and clearly not enough amperes to do some serious work.

[jadaro2600]

if you're using a 9v source, then the LED will light up even though the circuit isn't running ... it may even burn out.  Using a 1.5v source you can place an LED where the cap is on the right and test the circuit for voltage boosts.

Warning.  Considering the nature of collapse in the coils of a motor, it may be prudent to use ONLY ceramic disk capacitors as fly back from a collapsing magnetic field in one of the windings may cause a reverse in polarity and thus explode an electrolytic capacitor.

I should have though of this sooner.

You'll want to use a millifarad capacitor, a 450v .68mF ..or somethign to that effect.

Electrolytic may not be the best thing to use.

ranking: F, mF, uF, nF, pF ...

The smaller capacities will give you voltage faster, but may not be as effective, larger capacitors will take time to fill...  there will need to be a middle ground: the osilation circuit will need to cycle several times between commutations.

I will try an experiment with a prefab motor in the future - I may make a maiden you tube post about it.