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  1. #1
    Can anyone help me. I want to build a power supply with an output of 20v but with variable amp output.

    I am looking in the range of .5 to 15amps (At least 10amps) this doesnt have to have a high precision.

    I do a bit of anodising and this is what it would be used for. I would need a complete circuit diagram as i am at the back of the queue when it comes to electronics knowledge.

    Any indication of likely cost to build would be useful also.

    Thanks

  2. #2
    sorry cant help you with your power supply.... iv looked into doing a touch of anodising myself, are you managing to get hold of sulfuric acid, iv heard it can be a pain to get your hands on in the uk

  3. #3
    If you want sulphuric acid go to a battery repairers or car breakers plenty in old lead acid batteries, I think its about 25%.
    Just dont get it on your clothes it rots them for sure!

    Peter

  4. #4
    Quote Originally Posted by blackburn mark View Post
    are you managing to get hold of sulphuric acid, iv heard it can be a pain to get your hands on in the uk
    I get it from a commercial anodiser along with lots of help

    Phil

  5. Frankly, by the time you've screwed one together, it would be as cheap to buy one:

    If you're happy with 10A then something like this for 119 + vat would do : It'll do 0-30v with 0-10A I-limit

    http://www.rapidonline.com/Electrica...ated-PSU/77152


  6. The Following User Says Thank You to BillTodd For This Useful Post:


  7. #6
    That power supply looks good. Similar to what I use for the same purpose just a bit bigger.

    I get the sulfuric acid from B&Q...in the form of 'one shot drain cleaner'. It's about 7 for a litre of 91% concentration...so do be careful! One finds all sorts of uses for it...
    Last edited by Jonathan; 21-11-2010 at 06:07 PM.

  8. #7
    haha!! nice one jonathan,,, somthing else to pick your brain on when i get to it :)

  9. #8
    Careful the drain cleaner stuff is quite diluted. Go to a motor factor and ask for motorcycle top up acid. You can get it 1 litre bottles for a couple of quid. If you want more take a friend as they sometimes limit you to 1 per customer. i have 6 litres sat on my kitchen floor waiting for me to finish something worth anodising? caustic soda you can ask the local shop to get you some on their next trip to the cash and carry (do that part outside for god sake,,,fumes, fumes, fumes). Dylon dyes work better than the others (not the one you put in the washing machine). Hope this helps
    If the nagging gets really bad......Get a bigger shed:naughty:

  10. #9
    Quote Originally Posted by 2e0poz View Post
    Careful the drain cleaner stuff is quite diluted. Go to a motor factor and ask for motorcycle top up acid. You can get it 1 litre bottles for a couple of quid. If you want more take a friend as they sometimes limit you to 1 per customer. i have 6 litres sat on my kitchen floor waiting for me to finish something worth anodising? caustic soda you can ask the local shop to get you some on their next trip to the cash and carry (do that part outside for god sake,,,fumes, fumes, fumes). Dylon dyes work better than the others (not the one you put in the washing machine). Hope this helps
    I'm afraid I have to disagree. The one shot drain cleaner I mentioned is concentrated, 91% sulphuric acid. I don't call that dilute! I also got caustic soda cheap from B&Q. Those are about the only things I'll buy from that shop :lol:

    As for the dye I've only used the anodising dye sold on eBay. I found that the red dye I got faded with direct sunlight on my wind turbine - other than that they're fine.

  11. #10
    Jonathan

    I can only vouch for what i have seen and used, most of the drain cleaners claim to be concentrated but do come in different strengths. What you get from the motor factors is acid and not cleaner which contains other ingredients. The caustic soda i use is commercial grade and stripped all the paint off my 72 year old lathe no trouble at all. Preparation as with all jobs is the critical part and there is very little difference between anodising dye and clothing dye. The stuff you get from Ebay will not be from ICI? others report poor colouring from red in general. If it was a true commercial quality dye it would have the correct fixers for aluminium and the fading would be minimal. Give the dylon stuff a go you may be surprised? and make sure you have thoroughly neatralised the effects of the acid beforeadding the dye.
    If the nagging gets really bad......Get a bigger shed:naughty:

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