DIY Hacks & How To’s: Pocket Sized Power Supply



In this episode of DIY Hacks & How To’s, Jason Poel Smith build a simple, pocket-sized device for testing battery-powered electronics on the go–perfect for making sure you garage sale buys actually work. Read all about it on MAKE and get instruction for the full project: http://makezine.com/2013/07/01/pocket-sized-power-supply/

Go here to the project on Instructables: http://www.instructables.com/id/Pocket-Size-Power-Supply/

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49 thoughts on “DIY Hacks & How To’s: Pocket Sized Power Supply

  1. Kushagra Dixit September 29, 2017 at 2:58 am

    Why not use a lm2596 buck converter. They sell for less than two dollars

  2. Pangit Ako September 29, 2017 at 2:58 am

    Yes,because his idiot

  3. TRACER VISUAL ELECTRONICS September 29, 2017 at 2:58 am

    nice try more videos

  4. lksk99 September 29, 2017 at 2:58 am

    Can i use electrolytic capacitors instead of ceramic?

  5. I Stole Your Sandwich When You Looked Away September 29, 2017 at 2:58 am

    Does this still work in 2016….. A lot has changed

  6. Spikey DaPikey September 29, 2017 at 2:58 am

    So damn cool !!

  7. VitekST September 29, 2017 at 2:58 am

    Very efficient by the way.
    For battery powered stuff, linear regulators are tabu (at least by my opinion).

  8. Carla Hendriksson September 29, 2017 at 2:58 am

    ANY body know why he used a capacitor parallel to the voltage input and another capacitor at the voltage output?

  9. Michael Angel September 29, 2017 at 2:58 am

    I think although alot of you guys have some really great ideas for improvements, but most small electronic devices uses max 9v. Also, I think you're missing the point…IT'S A QUICK CHECKER!!!…but if you need more power on hand, connect two 9v in parallel and that should do the trick…wouldn't recommend using a Li-Po without a fuse circuit, because if the failure is with the electronic component, then it along with your handy-dandy checker will go up in flames…quickly

  10. jaffar syria September 29, 2017 at 2:58 am

    no pal the lm317 provides 1amp of direct current

  11. Ron Harper September 29, 2017 at 2:58 am

    A LOT more simple method is to simply get a clip connector for a 9 volt battery, put alligator clips on the ends of the bare wires or just hold the bare wires to the device + & – (It wont shock you, & if it does just a Very little tickle). Clip the 9 volt battery to its end, The alligator clips to the device & Presto. This will work for any device that takes Any regular battery : AAA, AA, A, C, CC, DD, D & such or 9 volt just to test it. Don't touch the wire ends together as it could short the battery out. ALSO, You can use a regular 6 volt lantern (flashlight) battery to power a regular car radio to test it, or in a pinch with bad weather. just run two pieces of wire one each from + & – on the battery to the + & – on the car radio. It'll run the radio for a few hours if its a good battery. I've done all of these many times over many years with No problems. No need to complicate things.

  12. Kyle Bergevain September 29, 2017 at 2:58 am

    looks like that would fit inside an altoids tin

  13. Stinky Cheese September 29, 2017 at 2:58 am

    It doesn't power the device long enough to see if it works in many cases because a 9V battery isn't capable of enough current for many things that use AA or larger cells.

  14. lukx31tutoriais September 29, 2017 at 2:58 am

    This charge cell phone?

  15. Tim Watson September 29, 2017 at 2:58 am

    Surprised you did not put an LED power indicator on it.

  16. Flofy387 September 29, 2017 at 2:58 am

    I can't say how Awesome this is 😀

  17. thomas hardin September 29, 2017 at 2:58 am

    That's it!
    I'm raiding the RadioShack!!!

  18. Sam Archibald September 29, 2017 at 2:58 am

    You could make a cool case with this project!

  19. aLaNiSsAk320 September 29, 2017 at 2:58 am

    I wish he showed a better Tutorial on this

  20. Mustafa Khan September 29, 2017 at 2:58 am

    Cool

  21. partysean September 29, 2017 at 2:58 am

    Put it in a altoids tin

  22. Maximilian Hans September 29, 2017 at 2:58 am

    Nice gadget, thanks for sharing.

  23. theultimaterockr September 29, 2017 at 2:58 am

    How old are those jeans????

  24. Nikidoesitright September 29, 2017 at 2:58 am

    i double dare you to try it 😉
    would be the better way imho.
    measure output volume and mark with a sharpy, a lot easier to make and to use.

  25. Centi Zen September 29, 2017 at 2:58 am

    The LM317 works, but if you are using it in any application where you need real battery life it is a bad decsion. It is a very inefficient way to transform power, discarding much of the battery power it is converting as heat.

    A DC/DC buck convertor usually has efficiencies of 95% or greater. The LM317 works as long as you aren't counting mAh, but when you need all the power you can get a LM317 is not the best choice.

  26. Centi Zen September 29, 2017 at 2:58 am

    Getting the pot to the precise resistance would be a challenge. You would have an unreliable power supply.

  27. Todd na September 29, 2017 at 2:58 am

    I love this project, It may look like easy project but it good for the experimenter.

  28. Gaider Abdul Al-Hazred September 29, 2017 at 2:58 am

    maybe what we have to ask is: Why don't use a potentiometer? :/

  29. NetrixCze September 29, 2017 at 2:58 am

    Can i use potentiometer???

  30. Martoes September 29, 2017 at 2:58 am

    Could someone please help me? I want to make a lamp and use perfboard to connect different components too like: a transformator, leds, a touch sensor, a power cord, a speaker sensor (that is hooked to the touch, like if you touch the lamp it goes on and plays a sound).

    Now on the electronic store the counter told me to get this Arduino Uno Rev3 as circuit board, but I think he is just trying to scam me and I think it can be much cheaper. PM me for more info.

    Thanks in regards,

    Dutch.

  31. Darkavatar September 29, 2017 at 2:58 am

    The video started with "I'm a big fan of garage sales and thrift stores…"

  32. Marco Mardegan September 29, 2017 at 2:58 am

    Two caps aren't the protections, they are in the circuit for levelling the voltage and give instant power to the load.

    You need at least a diode and a resistor to make sure you can't broke your circuit and, when you switch off the unit, the charge in the capacitor can flow in the opposite way so you can damage the voltage regulator… but i prefer a switching converter.

    Sorry for my english, bye.

  33. Merk Marley September 29, 2017 at 2:58 am

    Lol packo jeans

  34. Joshua Unitt September 29, 2017 at 2:58 am

    there's two filter caps on either end of the regulator, that's generally about all you need for this kind of power supply

  35. Breeanna Freeman September 29, 2017 at 2:58 am

    well he does shop in a thrift store

  36. infinit3SRO September 29, 2017 at 2:58 am

    You forgot to mention one more thing needed for this project…a degree in rocket science

  37. Jeff Herman September 29, 2017 at 2:58 am

    lol I noticed that too. I think the last time I saw Paco Jeans and the last time I saw a Simon were about the same time.

  38. TheAppleman352 September 29, 2017 at 2:58 am

    Yes this looks easy but this took me so long to actually make this in my shop at school

  39. Sirus September 29, 2017 at 2:58 am

    Yup, but the voltage would be a little bit off.Shouldn't make much difference with battery powered stuff.

  40. ChintamiAtmanegoro September 29, 2017 at 2:58 am

    and how about mini multimeter ? it really helpfull

  41. Marco Mardegan September 29, 2017 at 2:58 am

    Where is the protection?

  42. Cristian Barberena September 29, 2017 at 2:58 am

    #PacoJeans

  43. Jima Tohno September 29, 2017 at 2:58 am

    Either way, it has the same outcome. I don't see any advantages on that. I think his method is even better simply because you can use any switch to increase or decrease voltage. (which with a 1 switch per voltage mode, you might accidentally toggle a 9 volt switch on a 3 volt device.)

  44. Jima Tohno September 29, 2017 at 2:58 am

    AFAIK you can. Notice how the resistor array is hooked up to the voltage regulator. The resistors aren't what carries the output voltage, the resistor array's job is only to act as a voltage divider to adjust how much power the regulator will output.

  45. MaxGecko September 29, 2017 at 2:58 am

    I know you listed 7-270 ohm resistors, can i use 7-220ohm 1/4w resistors instead?

  46. arsyad aris September 29, 2017 at 2:58 am

    can you help me to make a voice recorder

  47. PvPbomber009 September 29, 2017 at 2:58 am

    very nice

  48. epicfail48 September 29, 2017 at 2:58 am

    Instead of using an array of resistors that you switch on until you ratchet the voltage down enough, why not use an array of different resistors that will give you an exact voltage based on a switch by switch basis? Combined will a joule thief, seems to me this would be a more consistent way. Any electronic engineers wanna fact check me on that?

  49. frozen2kx September 29, 2017 at 2:58 am

    Cool, I'll make one ASAP

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