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Type: Posts; User: James Milner

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  1. Replies
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    Unforeseen dangers

    I hooked up my superpole sg to a 6 v battery and walked away for a few minutes. Checked the reading on the battery and it hadn't moved and then noticed that the machine was making a little more noise...
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    Sorry I've been so slow to get things done but...

    Sorry I've been so slow to get things done but that's what you get with a large family and shift work!
    I have finally got round to dismembering and re-gluing my Monopole. This time with the two...
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    John, I changed the #18 to a #21 and it was...

    John,
    I changed the #18 to a #21 and it was still pretty tricky to tune. The double stacking is simply adding an extra magnet to each side of the superpole. This increases the magnetic flux just...
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    Slightly off topic, but as you know superpoles...

    Slightly off topic, but as you know superpoles can be notoriously difficult to get the trigger to provide a good switching signal particularly using #18 wire. My magnets were a little smaller than...
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    Mark, It is apparent that coil alignment is...

    Mark,
    It is apparent that coil alignment is highly critical. I have encountered the same. See the start of the this thread to see a similar report.
    Followed by my diagnosis with a dual trace...
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    Mark, An in circuit transistor tester can test...

    Mark,
    An in circuit transistor tester can test while "in circuit" but not operating. That is battery disconnected.
    That being said be wary of "damaged but operational transistors". i.e the junction...
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    Mark, You can use an in circuit transistor...

    Mark,
    You can use an in circuit transistor tester. I use one available as a kit from www.jaycar.com.au. But I'm sure if you did a search you will find many others.
    James
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    Pat, The imbedded videos are both disabled....

    Pat,
    The imbedded videos are both disabled.
    Would you mind posting the address direct to the you tube video.
    Thanks
    James
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    SHOTTKY DIODES. Well I fried my 40V 1A...

    SHOTTKY DIODES.

    Well I fried my 40V 1A shottky's. They just don't seem to handle the output. I am now trialing some Ultra Fast Diodes 1A 400V and they seem to be handling it so far.......
    I...
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    SCHOTTKY DIODES I had a play with Schottky...

    SCHOTTKY DIODES
    I had a play with Schottky diodes in preference with regular 1n4007's. Looking at the waveforms. The regular diodes let through some residual ripple voltage which surprised me. When...
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    Tom, just thinking a about this a little further....

    Tom, just thinking a about this a little further.
    Are you suggesting, or have you tried working out your magnet pass speed in milliseconds and the used the known inductance of the coil and worked...
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    TRIMMER RESULTS I built a 5 filar board and...

    TRIMMER RESULTS
    I built a 5 filar board and added 10 ohm 20 turn trimmers in series with the base resistors.
    I had set all the trimmers the same at 5 Ohm so I could adjust 5 Ohm in each direction. ...
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    Tom, do you mean a low ESR cap roughly slightly...

    Tom, do you mean a low ESR cap roughly slightly larger than the joule output of the battery in one magnet pass?
    Now how to calculate that joule output?
    James
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    Thanks Tom, It's nice to know I'm on the right...

    Thanks Tom,
    It's nice to know I'm on the right track

    James
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    TUNING BASE RESISTANCES ON DUAL TRACE...

    TUNING BASE RESISTANCES ON DUAL TRACE OSCILLOSCOPE
    Has anyone tried adding a 10 ohm 25 turn trimmer to the base resistors and tuning it on a dual trace oscilloscope? This way we could cause the...
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    PHASE LAG When I looked closely at each coil I...

    PHASE LAG
    When I looked closely at each coil I found that I had some excessive tolerance in the coil holder, particularly around the hole where the coils core material poked through. When I glued...
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    Thanks John, Mikey and others. My transistors...

    Thanks John, Mikey and others.
    My transistors are matched for each coil as are the base resistors.
    I did notice that the waves differed slightly in shape indicating slightly different capacitance...
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    Brodie, You are correct. I was leaving the other...

    Brodie,
    You are correct. I was leaving the other trigger unconnected. Yet when it didn't work. I used the trigger to help investigate the reasons why it wasn't working properly. I would never had...
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    Setup/Tuning Multicoil Machines

    PHASE LAG

    Hi all,
    Although I have successfully set up a superpole running two 5 filar coils, I think that it was more by chance that it worked successfully.
    I wanted to start a new thread to...
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    Yes John I was. And thanks for your reply. It...

    Yes John I was. And thanks for your reply. It makes things much clearer.
    James
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    John Koorn, Just for clarification I seem to...

    John Koorn,
    Just for clarification I seem to recall you used 100 Ohm base resistors on your Superpole (Early on in the life of this forum).
    Looks like you subscribe to using 470 Ohm base...
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    Sticky: Thanks Tom. Great to know about the work that...

    Thanks Tom.
    Great to know about the work that Howard Johnson did.
    Cheers
    James
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    Sticky: Tom, I know it has been a long time since you...

    Tom,
    I know it has been a long time since you made this comment, but I was wondering if you could elaborate.
    Is North the stronger, because the magnet was made in the Northern Hemisphere? used in...
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    Yoderll, I believe you have a shorted cell. Or...

    Yoderll,
    I believe you have a shorted cell. Or two!
    I ran an alum battery in my car for 6 months and cell voltage was about 11.7+ v resting. It struggled with the lower voltage but would turn over...
  25. As far as I can remember JB used aluminium...

    As far as I can remember JB used aluminium ammonium sulphate. But said that aluminium sulphate is just as good.
    I experimented on a number of sulphates. Sodium sulphate works as well. PH is acidic...
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