Muller Dynamo

[CLaNZeR]

Well the show is now archieved at:

http://www.youtube.com/watch?v=N-slq2USPC0

Just watched it after fast forwarding the first part!!!

I think the guy who posted about placing a resistive load on the output had a valid point and yep a lamp is pretty when lit up, but not exactly measurement.

The Input power is simple, measure the voltage and measure the current going in.
Use good old Ohms Law V xI

V x I we are talking Power=(Voltage*Current)
So if we had 10 Volts and 1 amp
10 X 1 = 10 Watts

Now on the external load place a rheostat (Variable resistor) of say 0-50 ohms.
Whack it to 10 ohms and then measure the current again and the voltage.
If we are getting the same voltage and current out, or a combination that using Ohms law gives us the same Watts. (For this example lets say we did get the same voltage and current readings out.)

The the next step, trim the rheostat to 9 ohms and voltage stays at 10 volt, current jumps upto say 1.111amps then we are now getting 11.11 Watts out and welcome to OU

Now you can measure current with your Digital Meters but you are only going to get an average, current reading, so better off popping either a current probe connected to the scope, or a Shunt resistor and place your probe across them, to get true current and the voltage. Then do the calculations over a time period.

Another point, regards speeds and flying magnets http://vimeo.com/18812966


Nice show though !

Cheers

Sean.

[AbbaRue]

I'm getting a strong erg to join in and build one of these my self. 

Here is a link for a place to get magnets in Ontario, Canada.
http://www.indigo.com/magnets/gphmgnts/Nd-large-disk-magnets.html 
25mmx5mm are 5.50 each 25mmx10mm are 11.00 each. 
I was contemplating getting the 5mm thickness,
but don't know if the plastic disk being less then 5mm thick would be strong enough.

An excellent place for other electronic parts is here:
(I have ordered parts from here and got them by the very next day, wow!)
http://www.futureelectronics.com/en/Pages/index.aspx

[bourne]

Hi Guys

I have finished watching the smartscarecrow show dated 20110519 http://youtu.be/N-slq2USPC0

Certainly was interesting, in an interesting kind of way.

--------------------------------------------

This is directed at Zerofossilfuels regarding the 'skin effect'

I will quote you from the above video at 27:54 seconds onwards

"when Romero says....you know....gives the explanation as to why he used litz wire, he Says, well it's to reduce the skin effect of the high frequencies in the coil

You also mention litz wire in relation to 'skin effect' at 1:09:22 seconds.

I would like to draw your attention to post #40 from this very thread which is a direct answer to Neptune's questions from the previous post (#39)

The magnets are 2cm diameter with 1cm thick, not very sure about the grade, I think are N38, I have bought them long time ago.
The reason to use multistrand is that most of my devices I built I used multistrand.
Some tests from other projects before showed me that using multistrand wire I get better results.
Another reason is the type of wire I had when I started the project adn also much easier to build the coils when the wire is more flexible. I think there are 7 wires in(I am not home now to check).
The ferrite rods are recovered from computer PSU, used as filters with copper wire on them. I do work with computers and all PSU I need to replace I get the goodies out before disposal, free source for many useful components.
The battery is 17 amp but it is about 5 years old, not very good but still works.
Regarding changing the driving coils... I prefer to keep it as is, I am happy enough with the results, no need to proove anything, I know it works. I started this project not to get super power but to see how it works and if it works, so far results are good enough. I bought a DC/DC converter today and this evening I will try self looping...

From this I can only conclude Romerouk found a benefit from using litz over single stranded.

[retrod]

Sorry if this was mentioned before.

A Litz source  http://www.surplussales.com/Wire-Cable/LitzWire.html

The "Brother" plastic bobbins can be found at Wal-Mart on a card of eight and are marked SAbobbin. This equates to a generic part SA156 and can be found on ebay or Amazon.

RD

[skycollection]

i am not an expert in electronics but i try to do the best i can...!
saludos
jorge