Confirmation of OU devices and claims

[gyulasun]

Can anyone explain to me why LEDs are always used as load (resistors) in all these threads /discussion groups about OU through the years.
Is it so that that is the best way to prolonge the threads duration (amount of words written) in an optimum way?
Whats wrong with resistors??

Arne

Hi Arne,

Good question     and I think there are at least two answers. 

One is that LEDs are spectacular and their brightness is a good indication for any adjustments a circuit needs while driving the LED.  Also, LEDs are perhaps the most efficient source of light nowadays, so why not use modern devices?

The other answer is that it can be a blessing for those who want to outsmart gullible people with brightness... What I mean: 

1) LED diodes draw current continously from a DC source because the DC voltage level should be higher than their forward voltage specification.   

2) However, LED diodes draw current from an AC source only when the peak voltage of the AC waveform is higher than their
forward voltage specification. This means that the LED does not draw current continuously within a full AC cycle but intermittently only. Yet the brightness of the LED can be similar to full brightness because human eye perceives it like that, while the average current hence power draw is less than in case of a normal DC drive.  This is why it is important to evaluate the actual power consumption for LEDs when making unusual claims.

If we consider off the shelf  LED light bulbs, then they are designed for either DC or AC operation and in the latter case they may have internal circuitry to rectify input AC etc. 

Confront this with a resistor load: it draws current from either a DC or an AC source all the time and it is a linear load while LEDs are highly nonlinear ones: this is another 'blessing'.   

I have often mentioned the pitfalls when someone demonstrates output power with the use of LEDs how bright they are but no actuall current and voltage measurements are taken.  This is true for a pulse motor for instance when it is combined with some generator coils and these output coils are loaded by LED lamps. 

Gyula

[gyulasun]

AlienGray,

Could you show even a hand drawn schematic on  your coils connection with their inductance values and capacitor values, this would greatly help giving a better answer. Include the frequency involved for your case.
I know there are several such circuit drawings shown in the actual threads but I do not want to wade through any of them and they may not show 'your version'.

Gyula

[seaad]

" ITSU:
When we roughly take this 60mW times 5 we get 300mW total consumed by the leds which is about 1/3 of the
power available at the input (COP = 0.3)."

Pls. compare the coils magnetic directions!

Arne

[AlienGrey]

AlienGray,

Could you show even a hand drawn schematic on your coils connection with their inductance values and capacitor values, this would greatly help giving a better answer. Include the frequency involved for your case.
I know there are several such circuit drawings shown in the actual threads but I do not want to wade through any of them and they may not show 'your version'.

Gyula

Hi yes something like this.

[itsu]

" ITSU:
When we roughly take this 60mW times 5 we get 300mW total consumed by the leds which is about 1/3 of the
power available at the input (COP = 0.3)."

Pls. compare the coils magnetic directions!

Arne

Hi Arne,

yes, seen that, but i don't think the right image is a working setup, just a show of of available parts.


Itsu