Muller Dynamo

[neptune]

I have just been pricing up some 20mm x10 mm thick neo  magnets . These cost about £5 each , so that means nearly £100 on magnets . 29mm x 5 mm are quite a bit cheaper . I would be interested to hear any opinions on using the 5mm magnets , or ceramic magnets or a cheaper source of magnets .

[romerouk]

Hi Groundloop, I am not clear in the following things:

1) How are the 4 driving coils (2 pairs) connected to each other, because the hall circuit shows only one (+) and one (-), but in fact we have 4x2 = 8 wires to connect?

2) The remaining 7 coil pairs: where exactly is the rectifier placed? And which parts are connected in series?
Is it that way: each coilpair (upper+lower) leads into a shared rectifier and from this rectifier the wires are connected in series to the other rectifiers? Or is it different like: each single coil has its own full bridge rectifier which then is connected in...*guessing*

the top and the bottom coils makes one coil, both in series +-+- the the 2 ends left connect to the circuit, the same for the other set of 2 coils. look at the picture below

[cap100nf]

@neptune

I bought from first4magnets.com F646 20mm dia x 10mm thick N42 Neodymium Magnet. Qty 50 and payed £1.80 per magnet.

Ciao

K.

[gauschor]

@Groundloop: Ah, i think its then for smoothing purpose only. The 47000 µF is a typo I assume, one "0" too much.
At least, I know how to solder the each of the 4 diode rectifiers

uh sorry to ask again: the last picture confuses me: you show a diode bridge, but it looks like you have 2 diode bridges. Isn't the box in the middle obsolete, i thought the rectifier should onl ylook like that: http://www.sunrom.com/images/media/3523.jpg

[romerouk]

@gauschor,

I think @romerouk did say in one of his posts that he did use the small capacitor
on the output from the diode bridges. I may be wrong, but it can't do any harm in any case.
Also not shown in the above drawing is the four 1N4007 diodes soldered in parallel on each diode bridge.

GL.

The capacitor u see in the video is connected before the DC/DC regulator, direct to the bridge rectifier.I had one at the output but it does not make any difference with the regulator in place