Muller Dynamo

[scratchrobot]

The rotor was no good and hit the coils, the magnets did not come off but the coils are a mess. I was lucky because it was not running at speed but I can imagine it can be very dangerous! If I build a new one I want to use another material.

@CrisC, nice build
@All, be carefull

scratchrobot

[gyulasun]

anyone here who knows how to trigger a 555 with a hall sensor? schematic...?

David,

here is a link, I mean to use the third schematic where there is a BC547 or 2N2222 shown: just connect the HAll output (which is an open collector) to Pin 2 of 555 (where the BC547 collector goes now, of course you omit this transistor and use the Hall's built-in transistor instead). Also change the 1 MOhm resistor to a lower value like 5-10 kOhm shown between Pin 2 and the input positive supply line. And the Hall's negative supply pin goes to the 555's negative supply line Pin 1 and the Hall's positive supply pin goes to the the 555's positive supply line too.
This is the simplest circuit for your question.

The link is http://www.555-timer-circuits.com/touch-switch.html 

[resonanceman]

The rotor was no good and hit the coils, the magnets did not come off but the coils are a mess. I was lucky because it was not running at speed but I can imagine it can be very dangerous! If I build a new one I want to use another material.

@CrisC, nice build
@All, be carefull

scratchrobot

scratchrobot

I am guessing that your center shaft was not quite square........ I have did that a few times.

I bought some polycarbonate a  while back for rotors......It costs more than acrylic but it is not as brittle......it will usually deform rather than crack and break.

gary

[e2matrix]

Wow! Please be careful. This stuff is no toy and at the few hundred to a few thousand RPM with the mass, the magnets can seriously injure. When my setup is ready, I will make sure to power it low enough to allow the disc to spin and making sure everything is tied down good, especially the rotor!
Good to know you're OK.

ps: oh, here's my current setup with the rotor freely spinning (manual) on smooth VCR bearings with magnets on it! Another 1 or 2 weeks I will hopefully update more.

cheers
chrisC

Nice!  Looks just like the VCR motor I pulled yesterday out of an old VCR.  I was trying to figure out how to get the motor to spin but with about 10 wires coming out of it I don't have much knowledge about how to do that or if it's even a DC motor.  I tried somethings that got it to jump a second but no spin up.  But it looks like it will work fine for a bearing for now. 

  Are your rotor and plates from TAP?  What thickness are you using ? 

@scratchrobot, sorry to hear about the problem.  Wobble + pressed fibre board was probably the combination that blew it apart.  Pressed fibre board is just not a good structurally sound material for this project IMO.  Don't give up though.  If you're on a budget you can probably find some scrap wood at construction sites either plywood or solid pine board will be better than what you had. 

[JouleSeeker]

I'm all for solid state OU but I haven't seen it and would welcome any real info that can lead to that.

E2Matrix, pls look here -- http://www.overunityresearch.com/index.php?topic=853.0 

Data I've taken with a Tektronix 3032 shows Pout/Pin ~ 7.   We would welcome replications or any input or questions you wish to provide.   (Are folks allergic to that other forum?)