Muller Dynamo

[i_ron]

I call it pin 1 the voltage in, from plus goes to pin 1 thru a 100ohm resistor.
This schematic was used by many others in the shorting coil experiments.It is simple and works great.For my next build I am going to use proper mosfets with dedicated driver circuits...

Not wishing to detract from your achievement but it is my understanding that the A3144 has a built in voltage regulator so no resistor is needed in the supply to pin 1. However, as Ground loop pointed out there should be a 5 to 10K resistor from pin 3 to + supply as a pullup for the open collector.
Normally this resistor can go from pin 1 to pin 3.

If this sketch came from EV Grey, then a word of caution, several circuits are incorrectly presented.

http://www.allegromicro.com/en/Products/Design/hall-effect-sensor-ic-applications-guide/AN27701.pdf

Fig 11

Ron

[gyulasun]

Looping or using a scope to measure the output power will tell the true story.

The input power (~ 11.3W) is going to be fairly accurate because of the DC source. However Gyula, you should be aware that multiplying an average current by an average voltage of an output produced by induced currents in a coil, is not going to have a power factor of 1, and therefore the simple product of 24W will not be accurate.

Judging by the intensity of the bulb and assuming the efficiency to be 80%, the true output power is likely closer to 8W or 9W.

Nice job on the build R.

.99

Hi poynt99,

In general you are right. But in this setup there should be an anomaly in the induction process because actually the looping works and your estimation of the 8-9W output would certainly be NOT enough to create the needed 11.3W.

As you surely noticed Romero used a full wave diode bridge at each coil output and although in his last but one video he did not use a puffer capacitor (later in the looping video he did) the moving coil current and voltage meters shown at the output did the averaging job pretty well. What really shows the anomaly, it is the input current: when Romero loads the output with the bulb, the 0.93A input current changes but a very little, it is like the action-reaction part would be at a minimum.

So it is the anomaly which is to be understood / explained.   

rgds,  Gyula

[romerouk]

Not wishing to detract from your achievement but it is my understanding that the A3144 has a built in voltage regulator so no resistor is needed in the supply to pin 1. However, as Ground loop pointed out there should be a 5 to 10K resistor from pin 3 to + supply as a pullup for the open collector.
Normally this resistor can go from pin 1 to pin 3.

If this sketch came from EV Grey, then a word of caution, several circuits are incorrectly presented.

http://www.allegromicro.com/en/Products/Design/hall-effect-sensor-ic-applications-guide/AN27701.pdf

Fig 11

Ron

Hi,
I understand what you are saying but this is exactly how I used the circuit and it works just fine.As I said before, other people here have replicated that circuit and worked perfec, I think woopy is one of them.I had it running as is from 3.5 volt input to 18v input.
That resistor has a role in my understanding, I don't care in general about the info presented about a product, I am always trying to see it my way and in general I was right.
As I said it works as is.

[neptune]

@I-ron . Thanks for clearing up that point about AC or DC output . @poynt99 .what you say about measurement and power factor is a point I brought up earlier .However , this argument becomes irrelevant in view of the fact that the machine has been looped AND feeds a load at the same time .

[gyulasun]

@I-ron . Thanks for clearing up that point about AC or DC output . @poynt99 .what you say about measurement and power factor is a point I brought up earlier .However , this argument becomes irrelevant in view of the fact that the machine has been looped AND feeds a load at the same time .

Hi Neptune,

As an addition to Ron's answer, here is a link you can read on the induced waveforms:
http://jnaudin.free.fr/html/mromexp.htm 

Gyula