Joule Thief 101

[tinman]

Hey good to see the same old NeoCIA spokespersons plugging away.

say Brad what is this other forum can someone link me?

good recently video re resonance by the way.

just keep experimenting (as you do )  when you are bored come chat with the NeoCIA guys.

(that's generally what i do, after all they are just doing their job )

Sure,although,as MH said,it has become quite quiet over there since myself and timberjack left the reins with 49er. Many others have also moved on-just life i guess

http://iaec.forumco.com/


Brad

[tinman]

Bill, are you seeing this:




Name Calling, he said I was a Number!


Terribly Painfull that was. I am shattered... Hahahahahaha

   Chris Sykes
       hyiq.org

Lol
Some times you crack me up Chris lol.

Bill,Bill--are you seeing this Bill.

Bill-where are you--lookit over here--MH bloody --Bill--you there Bill.

Bill-MH said  my ass--Bill--you there Bill--are you seeing this Bill.


Lol

[EMJunkie]

Lol
Some times you crack me up Chris lol.

Bill,Bill--are you seeing this Bill.

Bill-where are you--lookit over here--MH bloody --Bill--you there Bill.

Bill-MH said  my ass--Bill--you there Bill--are you seeing this Bill.


Lol

Hahahaha - I am glad my Humor tickles someone around here.

Try to lighten things up a bit when the heat is on!

Happy Days Brad, we have such a wonderfull future ahead of us!!!

Let me ask you, is the EMF 180 or 90, pm me the answer as I know its a touchy subject on this thread atm!

   Chris Sykes
       hyiq.org

[tinman]

Hahahaha - I am glad my Humor tickles someone around here.

Try to lighten things up a bit when the heat is on!

Happy Days Brad, we have such a wonderfull future ahead of us!!!

Let me ask you, is the EMF 180 or 90, pm me the answer as I know its a touchy subject on this thread atm!

   Chris Sykes
       hyiq.org

At 50Hz,with a 5 watt incandescent bulb as a load on the secondary.

As EMF is measured in voltage,then the EMF phase relationship between primary and secondary is either 180* or in phase with each other--depending where you place MHs dot's on the transformers primary and secondary windings. As it is AC,then either is correct. But if we are to stick to the dot convention,then the EMF phase relationship between L1 and L2 is 180*-as in first scope shot.

If the load on the secondary is purely resistive,then the currents phase angle relationship between L1 and L2 is also 180*-if we are to assume ideal (or near to) conditions-as in second scope shot.

At 50Hz-the frequency we are using for these examples,the voltage and current will be in phase with each other(or very close to) in both L1 and L2-as in 3rd scope shot.

But this is only with a resistive load placed on L2. If L2 is open,then there is a phase shift of about 90* between L1s current trace,and L2 EMF trace.

To quote TK---:

Brad, your scope shot shows the expected 90 degree phase difference as predicted by Faraday's Law: The induced (negative) EMF in the second coil is proportional to the _time rate of change_ of the inducing magnetic field from the first coil.

So in regards to my question on the schematic,where the secondary was open, and associated scope shot,TKs reply is correct. If a decent resistive load is placed on the secondary,and where we are operating at the transformers designed operational frequency,then L1s current  will be very close to 180* from L2s voltage/EMF.


Brad

[EMJunkie]

At 50Hz,with a 5 watt incandescent bulb as a load on the secondary.

As EMF is measured in voltage,then the EMF phase relationship between primary and secondary is either 180* or in phase with each other--depending where you place MHs dot's on the transformers primary and secondary windings. As it is AC,then either is correct. But if we are to stick to the dot convention,then the EMF phase relationship between L1 and L2 is 180*-as in first scope shot.

If the load on the secondary is purely resistive,then the currents phase angle relationship between L1 and L2 is also 180*-if we are to assume ideal (or near to) conditions-as in second scope shot.

At 50Hz-the frequency we are using for these examples,the voltage and current will be in phase with each other(or very close to) in both L1 and L2-as in 3rd scope shot.

But this is only with a resistive load placed on L2. If L2 is open,then there is a phase shift of about 90* between L1s current trace,and L2 EMF trace.

To quote TK---:
So in regards to my question on the schematic,where the secondary was open, and associated scope shot,TKs reply is correct. If a decent resistive load is placed on the secondary,and where we are operating at the transformers designed operational frequency,then L1s current  will be very close to 180* from L2s voltage/EMF.


Brad

Now this is what I call truely professional.

Nice Job! Yes a Resistive/Capacitive or Inductive load, or combinations of each, will change the Voltage Current Phase angle and sometimes it will be very dramatic!

The Voltage to Current Phase Angle, which needs to be measured and accounted for separately, is not aligned to Faradays Law of Electromagnetic Induction at all, its Load dependant. As you know already and have pointed out.

   Chris Sykes
       hyiq.org