1. Welcome to our site! Electro Tech is an online community (with over 100,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Mini 1.5V Booster!

Discussion in 'Members Lounge' started by Krumlink, Oct 7, 2007.

  1. Krumlink

    Krumlink New Member

    Joined:
    Aug 10, 2007
    Messages:
    2,080
    Likes:
    20
    Location:
    Michigan, USA
    After studying Transformers for hours, I found a simple circuit used for increasing power to a LED from a 1.2 to 1.5 Volt battery, because the LED you are using may require 2.0 to 3.0 Volts. This circuit uses parts that every hobbyist should have. If you dont have these parts, you may want to find a new career path :D

    The circuit is extremely basic, using only 1 capacitor, 1 resistor, 1 LED, and 1 NPN 2222A transistor. It also requires 1.2V to 1.5V input (a AA battery or button cell). It is a very easy circuit, fun for anybody starting electronics. It is based off a inductor, or ferromagnetic core (in my case, a bolt). It MUST be magnetic, or it would do nothing except look like a coil of wire around a bolt. Mine happened to fit perfectly into a small AA battery holder, making it very compact and super sweet looking.

    Parts required:
    1x 0.1uf capacitor
    1x 1k resistor
    1x red LED
    1x NPN PN2222A Transistor
    1.2-1.5 Volt Battery
    Some thin insulation wire (24 gauge with thin insulation wire, such as Cat5e wire)
    A Bolt slightly shorter than a AA battery (if you want it to fit inside a AA battery holder)
    Electricians tape

    Tools Required
    Soldering Iron
    Wire cutter/stripper
    Solder
    Nippy cutters
    Dremel (for cutting the hole in the case, my T13/4 LED fit perfectly snug in the case screw holder)
    Pliers

    STEP 1. Take the Transistor and Bend the Emitter and Collector 90 degrees to opposide sides (facing away from the Base). Take the LED and push the Leads together so they are close but not touching eachother. Then insert the Transistor between the leads (cathode to emitter and anode to collector) and push all the way through so it is almost laying on the transistor's labeled side. Solder and clip the LED leads.

    STEP 2. Spread the capacitor's leads apart and put the resistor inbetween them so the resistor is in parallel with the capacitor. Make sure they are as close to eachother as possible. Clip the capacitor's leads and solder one side to the base. Make sure you have everything as compact as possible.

    STEP 3. Take your bolt and some long wire and start wrapping it tightly around the bolt. Make sure it is uniform and neat, and it will look good. Have it end at the other side of the bolt (like a electromagnet nail). Take the other wire and wrap that round the wire and bolt too. End it on the opposide side you started. Solder 2 different sides together, and solder one of the remaining 2 sides to the capacitor resistor, and the other to the collector of the transistor.

    [​IMG]

    The above image is the circuit when finished. I substituted the 2700pf cap with a 0.1uf cap, but you can use anything within 0.1uf to 1000pf capacitor.

    finish the circuit and you are done!

    Mine works excellent and it looks awesome. Hope you have luck with yours.
    If you want to have fun with your circuit, change around the capacitance of the cap on it. I am going to make a solar powered flasher next and post it in the projects forum :D

    Here is the website just in case you want to look at it :D
    http://www.cappels.org/dproj/ledpage/leddrv.htm#Rusty_Nail_Night_Light

    NOTE: I will post pictures later today/tomorrow.
    Last edited: Oct 7, 2007
  2. HarveyH42

    HarveyH42 Banned

    Joined:
    Feb 25, 2006
    Messages:
    3,442
    Likes:
    18
    Location:
    Not Here
    Yeah, this is the 'Joule-Thief' circuit, should have just posted the link, just incase you left something out or misquoted something.
  3. Krumlink

    Krumlink New Member

    Joined:
    Aug 10, 2007
    Messages:
    2,080
    Likes:
    20
    Location:
    Michigan, USA
    I will post the link in the edit. I can make one of these in like 2 minutes xD
  4. Krumlink

    Krumlink New Member

    Joined:
    Aug 10, 2007
    Messages:
    2,080
    Likes:
    20
    Location:
    Michigan, USA
    So has anybody had any progress on their own Mini Volt Booster?

    If so post pictures! i wana see these things!
  5. audioguru

    audioguru Well-Known Member Most Helpful Member

    Joined:
    Mar 16, 2004
    Messages:
    29,496
    Likes:
    698
    Location:
    Canada, of course!
    ONLINE
    The circuit with a real ferrite core in the inductor works much better than the circuit with a rusty nail.
  6. Krumlink

    Krumlink New Member

    Joined:
    Aug 10, 2007
    Messages:
    2,080
    Likes:
    20
    Location:
    Michigan, USA

    I bet it would.

    I used a very magnetic bolt that worked well.

    I am going to pry apart some transformers and grab their magnetic magicness out of them.

    I was messing around with magnetic inductor designs, and I came up with a few wierd ones that worked suprisingly. It was a peice of magnetic rector set beam that had the wire weaved through it. Works pretty good.
  7. Sceadwian

    Sceadwian Banned

    Joined:
    Oct 27, 2006
    Messages:
    14,047
    Likes:
    140
    Location:
    Rochester, US
    Take apart a few old keyboards or monitor's with longish cables, they usually have RF chokes on them, they make pretty good cores for inductors.
  8. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    36,588
    Likes:
    402
    Location:
    Derbyshire, UK
    Moved to Chit Chat.

    The Electronics Project forum is for your own fully working projects, not simply copying someone elses work.

    Moderator.
  9. Marks256

    Marks256 New Member

    Joined:
    Jul 14, 2006
    Messages:
    2,350
    Likes:
    9
    Location:
    Minnesota, USA
    Ok, so today is yesterday's tomorrow, now where are the pictures? :p
  10. Krumlink

    Krumlink New Member

    Joined:
    Aug 10, 2007
    Messages:
    2,080
    Likes:
    20
    Location:
    Michigan, USA
    Why not move it into the Ideas projects and review spot instead of Chit Chat?

    Here are the pictures:
    The LED was so bright it messed up my camera's automatic brightness adjuster. It is a 2000mcd white LED.

    1523: The inductor coil in background, with circuitry in forefront.

    1521: The finished product, the LED was on but was so bright I had to take out battery to make sure it diddnt damage the camera

    1525: Another picture

    It works really great, and it has a project spot on my website.

    Attached Files:

  11. audioguru

    audioguru Well-Known Member Most Helpful Member

    Joined:
    Mar 16, 2004
    Messages:
    29,496
    Likes:
    698
    Location:
    Canada, of course!
    ONLINE
    I don't see your inductor.
    My solar garden light has an inductor the size and shape of a little electrolytic capacitor. It is about 5mm long by 3mm in diameter.

    Attached Files:

  12. Krumlink

    Krumlink New Member

    Joined:
    Aug 10, 2007
    Messages:
    2,080
    Likes:
    20
    Location:
    Michigan, USA
    It is the black thing in the background. It is homemade and tightly wrapped. It looks really good. if you look to the left of the capacitor, you can see the red and white wires of it.
  13. monkeybiter

    monkeybiter Member

    Joined:
    Oct 16, 2006
    Messages:
    200
    Likes:
    2
    Location:
    doncaster, u.k.
    well your photos are getting better, how about some new ones of your pastabots for your website.
  14. Krumlink

    Krumlink New Member

    Joined:
    Aug 10, 2007
    Messages:
    2,080
    Likes:
    20
    Location:
    Michigan, USA
    Yeah, I should Do that. Most of them need repair, but I can mod the pictures a bit and get them on the site soon :)
  15. HiTech

    HiTech Well-Known Member

    Joined:
    Jun 28, 2006
    Messages:
    2,874
    Likes:
    30
    Location:
    Penna. USA
    Other than experimentation and education, that little blue-boxed flashlight (torch for your Brits), seems to have minimal purpose. You can buy an Aurora 1.5w Nichia led flashlight w/ collimated lens, aircraft grade body and it all runs on 2 AA batteries for well under $15 US. It projects a concentrated beam of virtual white light well beyond a hundred feet and is blinding to anyone on the receiving end of it.

    BTW, that doesn't look like a flooring nail in the top photo... it's more like a masonry nail used in brick/block mortar.
  16. monkeybiter

    monkeybiter Member

    Joined:
    Oct 16, 2006
    Messages:
    200
    Likes:
    2
    Location:
    doncaster, u.k.
    ....thanks
  17. audioguru

    audioguru Well-Known Member Most Helpful Member

    Joined:
    Mar 16, 2004
    Messages:
    29,496
    Likes:
    698
    Location:
    Canada, of course!
    ONLINE
    Hee, hee.
    A torch has fire. A flashlight is a little portable electric light.
    A big difference. About 300 years of difference.
  18. monkeybiter

    monkeybiter Member

    Joined:
    Oct 16, 2006
    Messages:
    200
    Likes:
    2
    Location:
    doncaster, u.k.
    i thought you lot north of the border were on our side?
  19. audioguru

    audioguru Well-Known Member Most Helpful Member

    Joined:
    Mar 16, 2004
    Messages:
    29,496
    Likes:
    698
    Location:
    Canada, of course!
    ONLINE
    I am not a Brit!
    A truck is not a lorry.
    A friend is not a mate.
    The hood of a car is not its bonnet.
    We don't drive on the wrong side of the road in Canada.

    The Americans are also weird.
  20. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    36,588
    Likes:
    402
    Location:
    Derbyshire, UK
    You mean like the Canadians? :p

Share This Page

___...__