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Old Nov 23rd 2017, 07:14 PM   #31
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Originally Posted by yafimski View Post
Hi oz93666,

Sadly I am in the Netherlands. Only bikes here :/
I don't have somewhere to get a car battery, but I also didn't find one on ebay/amazon when I searched.

Can you recommend a place to buy one online...?
I did live in The Netherlands for a few years many cars everywhere ... and many shops selling car batteries , scrap yards with old batteries ...

Cannot buy lead acid battery online , postage would cost more than the battery!!

But if you don't already have access to a car battery , maybe forget that idea.

It really would help if you gave more details of what you want to do , it could probably be powered directly with mains electricity (230V)...

Last edited by oz93666; Nov 23rd 2017 at 07:16 PM.
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Old Nov 24th 2017, 12:20 AM   #32
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Dear oz93666,

I am attaching a photo to better describe what I wish to achieve as the experiment. The trial I made so far involved the nail, copper coil, and simple 9v battery, which turned out way too weak.

Does this help to figure out which power supply I need...?


Thanks!
Attached Thumbnails
Neodymium magnet and electromagnet experiment-img_20171124_081519.jpg  
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Old Nov 24th 2017, 04:46 AM   #33
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Originally Posted by yafimski View Post
Dear oz93666,

I am attaching a photo to better describe what I wish to achieve as the experiment. The trial I made so far involved the nail, copper coil, and simple 9v battery, which turned out way too weak.

Does this help to figure out which power supply I need...?


Thanks!
Thanks...I'm a little clearer ... you want to achieve some movement in a ring magnet ... My first comment is the coil needs to be much bigger . put "solenoid coil " in ebay and you'll find many , this one is 2 euros ...



or this one 3 euros ...it takes only 0.25 A .. possible with small domestic batteries ...it has many hundreds or perhaps thousands of turns in the coil...It would be very difficult , more expensive and time consuming for you to make one yourself that will produce the same effect


Last edited by oz93666; Nov 24th 2017 at 04:50 AM.
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Old Nov 24th 2017, 11:18 AM   #34
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Thanks!
I found these:

coil 1

coil 2

coil 3


which one would you recommend for the biggest effect?
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Old Nov 24th 2017, 06:34 PM   #35
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coil 1 is $2.34 free postage ..
coil 2 is $15 +46 postage (rule #1 ,never buy from US postage is a joke)
coil 3 is $15 + $25 postage

Since you are just experimenting I would suggest you buy perhaps 3 of the cheapest coils , coil 2 and 3 are not better quality,

coil 1 looks fine , I would get that , and a few others types for 2/3 euros each ...

You need to also think about power ...surely you have an old laptop charger , or a charger for an electric drill these would be perfect to try with the ebay coils.... any sort of charger
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Old Nov 25th 2017, 01:54 AM   #36
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Thanks! I'm ordering them

About the charging, can you explain what's the connection sequence of these elements? Maybe a quick sketch of how the charger should connect to the coil..? Or maybe it's a straight forward +/-.

Also - do I still need a nail to get it electromagnetic enough in order to effect the neomagnet?
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Old Nov 25th 2017, 04:05 AM   #37
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just plug the charger strait into the coil ...it would help to buy a multimeter , then you can see what amps and voltage you have ...another 4or 5 euros from ebay ....I you probably don't need the nail , depending on the coil design ...

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Old Nov 25th 2017, 05:40 AM   #38
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Thanks a lot! Will update with results!
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electromagnet, experiment, magnet, neodymium



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