Physics Help Forum Neodymium magnet and electromagnet experiment

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 Sep 27th 2017, 02:41 PM #21 Junior Member   Join Date: Sep 2017 Posts: 25 Thanks for the reply. Yes it's mostly considerations of cost. I would like to spend no more than a few tens of dollars on this power supply. I'll try to find an affordable one.
Sep 27th 2017, 03:37 PM   #22
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 Originally Posted by yafimski Thanks for the reply. Yes it's mostly considerations of cost. I would like to spend no more than a few tens of dollars on this power supply. I'll try to find an affordable one.
I always start such a search (i.e. amateur electronics construction) at Radio Shack and Amazon. Search under "DC Power Supply"

Don't be afraid to spend too much money on this since if your an experimenter you'll probably want if for something else in the future. Don't be afraid to spend $50 on it.  Sep 28th 2017, 05:02 AM #23 Junior Member Join Date: Sep 2017 Posts: 25 So I've found 2 types of DC power supply. Not sure which one is best or even if their specifications match my needs. Can you advice? https://www.amazon.com/Yescom-Precis...c+power+supply https://www.amazon.com/SUPERNIGHT-Un...c+power+supply Sep 28th 2017, 06:36 AM #24 Senior Member Join Date: Apr 2017 Posts: 271  Originally Posted by yafimski So I've found 2 types of DC power supply. Not sure which one is best or even if their specifications match my needs. Can you advice? The first one is the type of thing you need .... the second is for a dedicated purpose , not variable ... I buy everything from eBay ... this one is also 5A, 30V for only$12.... " 30V 5A Digital DC Power Supply Variable Adjustable Lab Bench Test Equipment Tool | eBay "

10A , 30V would be better if you want to spend that much ...

It's all about Amps and Volts , and if it looks right ...

 Sep 28th 2017, 06:43 AM #25 Junior Member   Join Date: Sep 2017 Posts: 25 Thanks! I'll update you once it arrives and I test it. Cheers.
 Nov 22nd 2017, 01:00 PM #26 Junior Member   Join Date: Sep 2017 Posts: 25 Hi guys, So I waited a long time for an item that didn't arrive from ebay... :/ I found this one on Amazon. Can anyone tell me if it will be strong enough for my tests or if there is a cheaper one perhaps? DC power supply Thanks!
 Nov 22nd 2017, 07:37 PM #27 Senior Member   Join Date: Apr 2017 Posts: 271 Sure ...that one looks fine , it will deliver 5A ... but make sure you really want it ... a car battery will deliver ten times more amps , and cost nothing , assuming you or your dad have a car....Even a junk discarded used car battery will deliver perhaps 20A I can't guarantee 5A @30V will be enough for your tests , you haven't given enough details about what you want to achieve Very strange your ebay purchase didn't arrive , I literally get about 100 items a year from them , maybe one goes missing/year ...anyway you can always get your payment back from ebay if the item fails to arrive.
 Nov 23rd 2017, 09:24 AM #28 Junior Member   Join Date: Sep 2017 Posts: 25 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...?
 Nov 23rd 2017, 10:44 AM #29 Senior Member     Join Date: Jun 2016 Location: England Posts: 444 You might have difficulty getting a Car Battery online, they are full of lead and sulphuric acid! So they are very heavy, and full of dangerous and toxic chemicals. (perhaps not the sort of thing that an ordinary delivery person will want to deal with). __________________ ~\o/~
 Nov 23rd 2017, 10:52 AM #30 Junior Member   Join Date: Sep 2017 Posts: 25 Mm... any recommendations on which product I could buy then..?