# Adjustable Breadboard Power Supply Kit ## Overview ![](https://cdn-learn.adafruit.com/assets/assets/000/004/747/medium800/adafruit_products_bbpsup_LRG.jpg?1396816130) This project details the design of a very low dropout adjustable power supply. A good power supply is essential to electronic projects. While there are many existing designs for adjustable power supplies, this one makes improvements that make it more useful for hobby designs. - MIC2941 regulator has guaranteed 1.25A output - Low dropout, only 40mV - 400mV compared to 1.25V - 2.0V for LM317. This means you can use a wider range of output voltages including generating 3.3V from as low as 3.7V (such as 3 AA's or a lithium ion battery)! - Short circuit and overheating protection - Input diode to protect circuitry from negative voltages or AC power supplies. - 2.1mm DC jack and terminal connector for voltage inputs - Two indicator LEDs for high and low voltages - Output selection switch to select from **3.3v,** **5v** and **Adjustable** - Onboard potentiometer for adjusting voltage from 1.25V up to within 0.5V of the input voltage. (20V max) - On/Off switch for entire board - Heat sink included # Adjustable Breadboard Power Supply Kit ## Make It # Adjustable Breadboard Power Supply Kit ## Tools and Preparation ## Tutorials - [Learn how to solder with tons of tutorials!](http://learn.adafruit.com/adafruit-guide-excellent-soldering) [ ](http://www.ladyada.net/learn/soldering/index.html) - [Don't forget to learn how to use your multimeter too!](http://learn.adafruit.com/multimeters) ## Tools There are a few tools that are required for assembly. None of these tools are included. If you don't have them, now would be a good time to borrow or purchase them. They are very very handy whenever assembling/fixing/modifying electronic devices! I provide links to buy them, but of course, you should get them where ever is most convenient/inexpensive. Many of these parts are available in a place like Radio Shack or other (higher quality) DIY electronics stores. **Soldering iron** Any entry level 'all-in-one' soldering iron that you might find at your local hardware store should work. As with most things in life, you get what you pay for. Upgrading to a higher end soldering iron setup, like the [Hakko FX-888 that we stock in our store](http://adafruit.com/products/180), will make soldering fun and easy.
Do not use a "ColdHeat" soldering iron! They are not suitable for delicate electronics work and can damage the kit ([see here](http://www.epemag.wimborne.co.uk/cold-soldering2.htm)). [Click here to buy our entry level adjustable 30W 110V soldering iron.](http://adafruit.com/products/180 "Link: http://adafruit.com/products/180") [Click here to upgrade to a Genuine Hakko FX-888 adjustable temperature soldering iron.](http://adafruit.com/products/303 "Link: http://adafruit.com/products/303")![adafruit_products_soldering_iron.jpeg](https://cdn-learn.adafruit.com/assets/assets/000/004/748/medium640/adafruit_products_soldering_iron.jpeg?1396816139) ![adafruit_products_soldering_iron_upgrade.jpeg](https://cdn-learn.adafruit.com/assets/assets/000/004/749/medium640/adafruit_products_soldering_iron_upgrade.jpeg?1396816147) **Solder** You will want rosin core, 60/40 solder. Good solder is a good thing. Bad solder leads to bridging and cold solder joints which can be tough to find. [Click here to buy a spool of leaded solder (recommended for beginners).](http://adafruit.com/products/145 "Link: http://adafruit.com/products/145") [Click here to buy a spool of lead-free solder.](http://adafruit.com/products/734)![adafruit_products_solder.jpeg](https://cdn-learn.adafruit.com/assets/assets/000/004/750/medium640/adafruit_products_solder.jpeg?1396816159) **Multimeter** You will need a good quality basic multimeter that can measure voltage and continuity. [Click here to buy a basic multimeter.](http://adafruit.com/products/71) [Click here to buy a top of the line multimeter.](http://adafruit.com/products/308) [Click here to buy a pocket multimeter.](http://adafruit.com/products/850)![adafruit_products_ID71multimeter_LRG.jpeg](https://cdn-learn.adafruit.com/assets/assets/000/004/751/medium640/adafruit_products_ID71multimeter_LRG.jpeg?1396816170) ![adafruit_products_extech330_LRG.jpeg](https://cdn-learn.adafruit.com/assets/assets/000/004/752/medium640/adafruit_products_extech330_LRG.jpeg?1396816180) ![adafruit_products_ID850_LRG.jpeg](https://cdn-learn.adafruit.com/assets/assets/000/004/753/medium640/adafruit_products_ID850_LRG.jpeg?1396816191) **Flush Diagonal Cutters** You will need flush diagonal cutters to trim the wires and leads off of components once you have soldered them in place. [Click here to buy our favorite cutters.](http://adafruit.com/products/152)![adafruit_products_cutter.jpeg](https://cdn-learn.adafruit.com/assets/assets/000/004/754/medium640/adafruit_products_cutter.jpeg?1396816201) **Solder Sucker** Strangely enough, that's the technical term for this desoldering vacuum tool. Useful in cleaning up mistakes, every electrical engineer has one of these on their desk. [Click here to buy a one.](http://adafruit.com/products/148)![adafruit_products_soldersucker_LRG.jpeg](https://cdn-learn.adafruit.com/assets/assets/000/004/755/medium640/adafruit_products_soldersucker_LRG.jpeg?1396816210) **Helping Third Hand With Magnifier** Not _absolutely_ necessary but will make things go much much faster, and it will make soldering much easier. [Pick one up here.](http://adafruit.com/products/291)![adafruit_products_thirdhand_LRG.jpeg](https://cdn-learn.adafruit.com/assets/assets/000/004/756/medium640/adafruit_products_thirdhand_LRG.jpeg?1396816216) # Adjustable Breadboard Power Supply Kit ## Parts List Check to make sure your kit comes with the following parts.Sometimes we make mistakes so double check everything and email support@adafruit.com if you need replacements!# Adjustable Breadboard Power Supply Kit ## Solder It Prepare to assemble the kit by checking the parts list and verifying you have everything! Next, heat up your soldering iron and clear off your desk. Place the circuit board in a vise so that you can easily work on it. ![adafruit_products_ready.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/808/medium640/adafruit_products_ready.jpg?1396816669) We'll start by placing the DC power jack. This is how we will attach outlet power supplies to the board. The jack is 2.1mm which is the most common size. The DC jack can only go in one way, so its pretty easy to work with. ![adafruit_products_jackplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/810/medium640/adafruit_products_jackplace.jpg?1396816688) Flip over the PCB - you can either tape the DC jack down or use a finger to keep it place. Solder the three big pads that bring power to the board. Make sure to use **lots** of solder! This is both an electrical and mechanical connection so it needs to be solid. ![adafruit_products_jacksolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/811/medium640/adafruit_products_jacksolder.jpg?1396816696) ![adafruit_products_jacksolder2.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/812/medium640/adafruit_products_jacksolder2.jpg?1396816706) ![adafruit_products_jackdone.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/813/medium640/adafruit_products_jackdone.jpg?1396816716) Next we will solder in the 1N5818 protection diode. Diodes only conduct electricity in one direction. This means we can use them to protect our circuitry from negative voltages - a top killer of electronics! Bend the diode into a staple like so. Note one side has a white/silver stripe on it. ![adafruit_products_diodebent.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/814/medium640/adafruit_products_diodebent.jpg?1396816727) Place the diode next to the marking **D1**. See that there is a white stripe on the silkscreen? Make sure that the white stripe on the diode matches that below it. Otherwise you'll find that the kit doesn't work at all! Bend the two wire leads out so that the diode sits flat against the PCB. ![adafruit_products_diodeplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/815/medium640/adafruit_products_diodeplace.jpg?1396816737) Now solder both wires to the PCB. Press the flat of the soldering iron tip against both the wire and the pad (silver ring in the PCB) for a few seconds and then poke in some solder. Then remove the solder. Then finally remove the iron. The solder joint should be a shiny cone. [I suggest reading our preparatory tutorials too](http://learn.adafruit.com/adjustable-breadboard-power-supply-kit). ![adafruit_products_diodesolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/816/medium640/adafruit_products_diodesolder.jpg?1396816744) Now use your diagonal cutters to clip the long leads just above the solder joint. ![adafruit_products_diodeclip.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/817/medium640/adafruit_products_diodeclip.jpg?1396816752) ![adafruit_products_diodeclipped.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/818/medium640/adafruit_products_diodeclipped.jpg?1396816763) Now flip back over. Next we wil solder in the ON/OFF switch! Its pretty clear what we use it for :) The switch is 'symmetric' so don't worry about putting it in backwards because it is the same either way. ![adafruit_products_powerplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/819/medium640/adafruit_products_powerplace.jpg?1396816772) Tape or hold the switch in place while you solder all three pins.![adafruit_products_powersolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/820/medium640/adafruit_products_powersolder.jpg?1396816782) ![adafruit_products_powerdone.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/821/medium640/adafruit_products_powerdone.jpg?1396816793) We're going to solder one of the 1.0K resistors in next. The resistors should be bent over 180 like shown. Note that resistors are 'non-polarized' so you can put them in 'either way' - they work the same forwards or backwards.![adafruit_products_resbent.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/822/medium640/adafruit_products_resbent.jpg?1396816803) Place one of the 1.0K resistors (Brown Black Red Gold) into the slot marked R1. Then place right next to it one of the 0.1uF ceramic capacitors (they're small and yellow). The resistors and ceramic capacitors are non-polarized so they can go in 'either way'. The resistor sets the brightness of the 'high voltage' indicator LED. The 0.1uF capacitor provides high frequency filtration to make the power supply cleaner. Bend the leads out so that the parts don't fall out when you flip over the board. ![adafruit_products_cap1place.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/823/medium640/adafruit_products_cap1place.jpg?1396816812) ![adafruit_products_cap1flip.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/824/medium640/adafruit_products_cap1flip.jpg?1396816823) Solder in the two components.![adafruit_products_cap1solder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/825/medium640/adafruit_products_cap1solder.jpg?1396816832) ![adafruit_products_cap1soldered.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/826/medium640/adafruit_products_cap1soldered.jpg?1396816842) Then clip the long leads off.![adafruit_products_cap1clip.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/827/medium640/adafruit_products_cap1clip.jpg?1396816853) ![adafruit_products_cap1clipped.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/828/medium640/adafruit_products_cap1clipped.jpg?1396816863) Now we will place one of the 47uF electrolytic capacitors **C2**. This component provides low-frequency filtration to clean up the 'high voltage' power line. Electrolytic capacitors are **polarized** that means they must go in the right way or they will make your kit not work! See how one leg of the capacitor is longer? That is the positive (+) lead. Make sure that lead goes into the pad marked with a +. See the image left for details. ![adafruit_products_elect1place.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/829/medium640/adafruit_products_elect1place.jpg?1396816873) We will finish up the 'high voltage' power supply side by placing the green indicator LED. This LED will let us know that power is working! LEDs are diodes so they are polarized. If not placed correctly they will not work! So make sure you get this right. See how one leg of the LED is longer? That is the positive (+) lead. Make sure that lead goes into the pad marked with a +. See the image left for details. ![adafruit_products_greenplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/830/medium640/adafruit_products_greenplace.jpg?1396816884) Bend the leads out so the parts sit flat against the PCB. Solder and clip the leads. ![adafruit_products_9vcapplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/831/medium640/adafruit_products_9vcapplace.jpg?1396816893) ![adafruit_products_9vcapsolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/832/medium640/adafruit_products_9vcapsolder.jpg?1396816902) ![adafruit_products_9vcapclip.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/833/medium640/adafruit_products_9vcapclip.jpg?1396816913) Lets take a break and test the current progress. Take the kit out of the vise and make sure there are no stray wires kicking around that could cause the board to short. Plug in a DC power supply, center positive. Switch the power switch to the ON position. You should see the green LED light up. If it doesnt, check that you have a center-positive power supply, that the diode is in right, etc. You may also want to test the voltage at the V- and (-) pads near the LED to see if you are seeing a voltage there. [See my multimeter tutorial for information on how to perform these tests](http://learn.adafruit.com/multimeters/ "Link: http://learn.adafruit.com/multimeters/"). Once you've verified its all good, lets continue assembly. ![adafruit_products_9vtest.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/834/medium640/adafruit_products_9vtest.jpg?1396816920) Now we will solder in the heart of the kit, the MIC2941 adjustable voltage regulator. The regulator must be placed correctly to work. Make sure that the big silver tab is at the edge of the PCB (theres a thick white line on the silkscreen to indicate it). You'll want to solder the part so it sticks up some - that way you can attach a heatsink easily - as shown. ![adafruit_products_regplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/835/medium640/adafruit_products_regplace.jpg?1396816931) Solder the regulator in. If you placed the regulator as suggested, you shouldn't have to clip the leads as they'll be short.![adafruit_products_regsolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/836/medium640/adafruit_products_regsolder.jpg?1396816943) ![adafruit_products_regdone.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/838/medium640/adafruit_products_regdone.jpg?1396816963) The regulator uses resistors to set the adjustable output voltages. We'll now solder those in. First is 11.0K **R3** (Brown Brown Black Red Brown) - this resistor sets the 3.3V output level. ![adafruit_products_r3place.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/839/medium640/adafruit_products_r3place.jpg?1396816973) Second is 6.49K **R5** (Blue Yellow White Brown Brown) - this resistor is the 'reference' divider for all the voltages. ![adafruit_products_r5place.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/840/medium640/adafruit_products_r5place.jpg?1396816984) Third is 20.5K or 20.0K **R4** (Red Black Green Red Brown or Red Black Black Red Brown) - this resistor sets the 5V output voltage. ![adafruit_products_r4place.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/841/medium640/adafruit_products_r4place.jpg?1396816994) Solder and clip the three resistors.![adafruit_products_ressolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/844/medium640/adafruit_products_ressolder.jpg?1396817024) ![adafruit_products_resclipped.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/845/medium640/adafruit_products_resclipped.jpg?1396817034) Now we need a way to select which resistor is connected to the regulator. For that we use a 3-way switch. The switch can only go in one way. Solder in all the legs of the switch. Be careful because the solder points are small and somewhat close together. Make sure you don't have a short circuit and that each point is soldered. ![adafruit_products_vswitch_place.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/847/medium640/adafruit_products_vswitch_place.jpg?1396817053) ![adafruit_products_vswitchsolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/848/medium640/adafruit_products_vswitchsolder.jpg?1396817065) ![adafruit_products_vswitchdone.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/849/medium640/adafruit_products_vswitchdone.jpg?1396817074) Now we will put in the capacitors and LEDs for the left hand "low voltage" side. First is the red indicator LED. Remember LEDs are polarized. Make sure the long lead goes into the (+) marked pad.![adafruit_products_5vledplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/850/medium640/adafruit_products_5vledplace.jpg?1396817083) Next is the large electrolytic capacitor. Just like the other one, its polarized. Make sure the long lead goes into the (+) marked pad.![adafruit_products_5velectrplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/851/medium640/adafruit_products_5velectrplace.jpg?1396817093) Finish off the 'low voltage' side by inserting the second 1.0K resistor **R2** and the second 0.1uF ceramic capacitor **C4**. Solder and clip all the leads. ![adafruit_products_5vplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/852/medium640/adafruit_products_5vplace.jpg?1396817106) ![adafruit_products_5vsolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/853/medium640/adafruit_products_5vsolder.jpg?1396817111) ![adafruit_products_5vdone.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/854/medium640/adafruit_products_5vdone.jpg?1396817118) Lets take another break and quickly test what we've done so far. Remove the PCB from the vise and clear off the tape from wire bits. Then plug in your DC power supply again. Switch the kit ON and switch the voltage selection switch from 3V to 5V to Adj. The red LED should change in brightness. It should be dim at 3V, brighter at 5V and brightest at Adj. (we haven't put in the adjusting potentiometer yet). ![adafruit_products_3vtest.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/855/medium640/adafruit_products_3vtest.jpg?1396817128) ![adafruit_products_5vtest.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/856/medium640/adafruit_products_5vtest.jpg?1396817139) ![adafruit_products_trimplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/857/medium640/adafruit_products_trimplace.jpg?1396817150) Lets finish up this kit! Place the 100K trim potentiometer in the middle. This is what lets us adjust the voltage output from 1.25V to 20V. The trimmer sits above the PCB a bit, this is OK. ![adafruit_products_trimplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/858/medium640/adafruit_products_trimplace.jpg?1396817160) ![adafruit_products_trimsolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/859/medium640/adafruit_products_trimsolder.jpg?1396817172) Next we will solder in the 2-pin terminal jack. This lets us connect up wires to power the board from a battery or similar. Make sure that the 'holes' of the terminal block are facing **out** so that you can plug wires in! ![adafruit_products_termplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/860/medium640/adafruit_products_termplace.jpg?1396817182) ![adafruit_products_termsolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/861/medium640/adafruit_products_termsolder.jpg?1396817193) ![adafruit_products_termdone.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/862/medium640/adafruit_products_termdone.jpg?1396817203) You've finished the power supply, now onto the 'breadboard' part! Break off 2 2-pin pieces of header and stick them into the two power rails on the side of the breadboard ![adafruit_products_headerplace.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/863/medium640/adafruit_products_headerplace.jpg?1396817213) Now place the power supply on top. If it fits nicely, solder the four pins. Some breadboards are spaced differently, in which case you will have to skip ahead. ![adafruit_products_headeron.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/864/medium640/adafruit_products_headeron.jpg?1396817224) ![adafruit_products_headersolder.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/865/medium640/adafruit_products_headersolder.jpg?1396817234) ![adafruit_products_done.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/866/medium640/adafruit_products_done.jpg?1396817245) If your breadboard has nonstandard spacing, you can still plug it in using the header-breakouts in the middle. You'll need to jumper the wires over to the power supply rails as shown. ![adafruit_products_headerplace2.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/867/medium640/adafruit_products_headerplace2.jpg?1396817255) ![adafruit_products_headersolder2.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/868/medium640/adafruit_products_headersolder2.jpg?1396817267) ![adafruit_products_headerwire.jpg](https://cdn-learn.adafruit.com/assets/assets/000/004/869/medium640/adafruit_products_headerwire.jpg?1396817280) # Adjustable Breadboard Power Supply Kit ## How to Use This kit is very easy to use. First you should make sure your kit is all assembled, check the assembly instructions and solder it up!Info: ## Right hand 'input' There are two "outputs" on the board. The right hand side is the 'high' voltage side. This is the power coming straight from the DC jack or terminal block. There is a diode to prevent negative voltages but pretty much its going to be within 200mV of the input. ![](https://cdn-learn.adafruit.com/assets/assets/000/004/924/medium800/adafruit_products_vintest.jpg?1396818031) For example, this photo is me testing the output of the right hand side with a 12VDC regulated power adapter attached. The voltage is within 200mV of 12V. The green LED indicates that there is power on the right hand side.## Left hand 'output' The left hand side is the 'regulated' voltage side. This is the power that is running through the voltage regulator. This voltage is adjustable If you select **3.3v** on the voltage selection switch you will be able to measure that output voltage. The red indicator LED will be somewhat dim ![](https://cdn-learn.adafruit.com/assets/assets/000/004/925/medium800/adafruit_products_meter3vtest.jpg?1396818041) Then you can also select **5V** to generate a regulated 5V supply. ![](https://cdn-learn.adafruit.com/assets/assets/000/004/926/medium800/adafruit_products_meter5vtest.jpg?1396818052) Finally, by selecting **Adj.** you can adjust the supply to anything you want from as low as ~1.3V to within half a volt of the input (which can be as high as 20V). ![](https://cdn-learn.adafruit.com/assets/assets/000/004/927/medium800/adafruit_products_adjust.jpg?1396818062) Once you set the pot, the output voltage is not dependent on the input voltage. That is, if you dial in 6V and you switch from a 9V to 12V supply, the output will stay at 6V.![](https://cdn-learn.adafruit.com/assets/assets/000/004/928/medium800/adafruit_products_vadjmin.jpg?1396818072) ![](https://cdn-learn.adafruit.com/assets/assets/000/004/929/medium800/adafruit_products_vadjmax.jpg?1396818083) ## Heatsinking! If your supply keeps cutting out and is very hot, it needs a heatsink! You can just slip it on. ![](https://cdn-learn.adafruit.com/assets/assets/000/004/930/medium800/adafruit_products_heatsink.jpg?1396818094) # Adjustable Breadboard Power Supply Kit ## Downloads ## Files for v1.0 These files are all released under CC Attrib. / Share-alike. Enjoy! - [Schematic](http://learn.adafruit.com/system/assets/assets/000/010/171/original/supply.sch.txt) & [board](http://learn.adafruit.com/system/assets/assets/000/010/172/original/supply.brd) files in EagleCAD format - [Schematic in PNG](http://learn.adafruit.com/system/assets/assets/000/010/173/original/bbsupplyschem.png) [Fritzing object in the Adafruit Fritzing Library](https://github.com/adafruit/Fritzing-Library) # Adjustable Breadboard Power Supply Kit ## Support Forums ## Primary Products ### Adjustable breadboard power supply kit [Adjustable breadboard power supply kit](https://www.adafruit.com/product/184) This kit is for making your own breadboard-friendly very low dropout adjustable power supply. A good power supply is essential to electronic projects. While there are many existing designs for adjustable power supplies, this one makes improvements that make it more useful for hobby... In Stock [Buy Now](https://www.adafruit.com/product/184) [Related Guides to the Product](https://learn.adafruit.com/products/184/guides) ## Featured Products ### Large Premium Solderless Breadboard [Large Premium Solderless Breadboard](https://www.adafruit.com/product/443) For really big projects, give yourself some room to work in, with a massive 2250-point breadboard - equivalent in size to three full-sized breadboards side by side. The breadboards are mounted onto a metal plate and comes with 4 colored posts you can use with a bench-top supply.... In Stock [Buy Now](https://www.adafruit.com/product/443) [Related Guides to the Product](https://learn.adafruit.com/products/443/guides) ### Full Sized Premium Breadboard - 830 Tie Points [Full Sized Premium Breadboard - 830 Tie Points](https://www.adafruit.com/product/239) This is a 'full-size' premium quality breadboard, 830 tie points. Good for small and medium projects. It's 2.2" x 7" (5.5 cm x 17 cm) with a standard double-strip in the middle and two power rails on both sides. You can pull the power rails off easily to make the... In Stock [Buy Now](https://www.adafruit.com/product/239) [Related Guides to the Product](https://learn.adafruit.com/products/239/guides) ### Half Sized Premium Breadboard - 400 Tie Points [Half Sized Premium Breadboard - 400 Tie Points](https://www.adafruit.com/product/64) This is a cute, half-size breadboard with 400 tie points, good for small projects. It's 3.25" x 2.2" / 8.3cm x 5.5cm with a standard double-strip in the middle and two power rails on both sides. You can pull the power rails off easily to make the breadboard as... In Stock [Buy Now](https://www.adafruit.com/product/64) [Related Guides to the Product](https://learn.adafruit.com/products/64/guides) ### 5V 2A (2000mA) switching power supply - UL Listed [5V 2A (2000mA) switching power supply - UL Listed](https://www.adafruit.com/product/276) This is an FCC/CE certified and UL listed power supply. Need a lot of 5V power? This switching supply gives a clean regulated 5V output at up to 2000mA. 110 or 240 input, so it works in any country. The plugs are "US 2-prong" style so you may need a plug adapter, but you can pick one... In Stock [Buy Now](https://www.adafruit.com/product/276) [Related Guides to the Product](https://learn.adafruit.com/products/276/guides) ## Related Guides - [Adafruit CAP1188 Breakout](https://learn.adafruit.com/adafruit-cap1188-breakout.md) - [Experimenter's Guide for Metro](https://learn.adafruit.com/experimenters-guide-for-metro.md) - [LSM303 Accelerometer + Compass Breakout](https://learn.adafruit.com/lsm303-accelerometer-slash-compass-breakout.md) - [Adafruit ESP32-S3 Reverse TFT Feather](https://learn.adafruit.com/esp32-s3-reverse-tft-feather.md) - [Adafruit Audio FX Sound Board](https://learn.adafruit.com/adafruit-audio-fx-sound-board.md) - [Adafruit LTC4316 I2C Address Translator](https://learn.adafruit.com/adafruit-ltc4316-i2c-address-translator.md) - [Adafruit TSMP96000 IR Receiver Breakout](https://learn.adafruit.com/adafruit-tsmp96000-ir-receiver-breakout.md) - [Adafruit ADG729 Dual 1-to-4 Analog Matrix Switch](https://learn.adafruit.com/adafruit-adg729-dual-1-to-4-analog-matrix-switch.md) - [Adafruit 20W Stereo Audio Amplifier - MAX9744](https://learn.adafruit.com/adafruit-20w-stereo-audio-amplifier-class-d-max9744.md) - [Adafruit Feather M0 Radio with LoRa Radio Module](https://learn.adafruit.com/adafruit-feather-m0-radio-with-lora-radio-module.md) - [Adafruit Sparkle Motion Stick](https://learn.adafruit.com/adafruit-sparkle-motion-stick.md) - [Introducing Feather RP2040 SCORPIO](https://learn.adafruit.com/introducing-feather-rp2040-scorpio.md) - [Madison's NeoClock - A PIC + KiCAD + NeoPixel adventure](https://learn.adafruit.com/madisons-neoclock-a-pic-kicad-neopixel-adventure.md) - [Cup o' Sound](https://learn.adafruit.com/cup-o-sound.md) - [2.3" Monochrome 128x32 OLED Display Module](https://learn.adafruit.com/2-3-monochrome-128x32-oled-display-module.md)