Diy 5v Power Supply

The inductor L4 has three coils for +5V, +12V and -12V outputs. If you need a cold start (start from battery without any external power connected) there is a small button. The LM317 regulator chip provides excellent ripple and regulation characteristics, plus current limiting and short circuit/thermal/overload protection. So I decided to make a good looking and cheap power supply out of cheap modules. Some modern LiPo chargers are able to charge multiple battery packs at once. Transformer less AC to DC power supply circuit using dropping capacitor Gallery of Electronic Circuits and projects, providing lot of DIY circuit diagrams, Robotics & Microcontroller Projects, Electronic development tools. You can hear switching relay and see switching modes of power bank (IN/OUT). This transformer has a 11. com to instructables. 3V from a 5V supply. I though it would take an hour--instead it took most of two afternoons, including 2 trips to Radio Shack. For the electronics enthusiast, having a 5 volt DC power supply around in your workspace can be very useful. There is always some voltage drop so the power supply rails will be at least +/-15V in this case. It’s a switch mode power supply that takes the same space as a traditional linear regulator. Its main use is feeding phono and linestage tubes, to keep hum levels down. 5V regulated power supplies come in three styles: Switching. A variable bench power supply is the most important tool for any DIY maker cause while testing circuit it needs different values of voltage and current. as you describe. Many op amps, micro controllers, and other digital ICs {integrated circuits} run off. Because I want to be able to use this supply with a controller, I will use 12-bit DAC's to drive the volt and current settings. suspect is a dodgy internal power supply. 5V is standard USB bus power, so if the product is intended for use anywhere near a computer they will probably build it for 5. Completely flooded in a special non-conductive cooling liquid, the fan-less PSU-1000ATX-12N is superior to even "partly" water cooled and heat pipe power supplies. Home / Keyword: Power Supply Kits. , which like I say, allows you to run your Commodore using a 5V USB supply and a 9VAC SNES supply. 12V is standard in vehicles. The LT6658-2. 1" headers are mounted on the bottom of the PCB for simple insertion into a breadboard. net were interested in the various power supply options for Microsoft Surface products. I love DIY and home-brewing. If you want to use a single AA battery or three AA batteries, it will still send out 5V. The Power Supply will be an Arduino UNO Power Supply Shield which will output multiple voltage range such as 3. 31 - 1 / Piece, 2017, Power Supply Module, Power Supply Module. So in this tutorial, I'm going to show you. Screw connectors for each of the wiring. It can supply 625mA at +12V and 625mA at -12V using a DC-DC dual-output module. I have read discussions on 9V/5V and understand Arlo Pro 2's charger is Qualcomm Quick Charge and will supply dual voltage when charging (9V) and running (5V) the camera. In this project, we will show how to build a switch mode power supply circuit with a MC34063 chip. Almost all digital circuits are works under 5V power supply. , which like I say, allows you to run your Commodore using a 5V USB supply and a 9VAC SNES supply. Detail other see in picture circuit. A DIY 5V-3V Switching Converter In The Space Of A TO-220 Package. I've been driving with my DIY uninterruptible power supply for my Xiaomi YI for quite some time now. as you describe. Filtering the 5V USB power supply line Posted on Jul 24, 2015 in hardware I’m currently working on a new project that contains sensitive analogue components and have rediscovered what many before me already know, that is that the VUSB 5V line that comes out from your computer’s USB hub is noisy. variable dc power supply 1 to by circuit - 28 images - dual adjustable power supply 1 to dc 1 0 6 power supply circuit using and my variable dc power supply 1 to by power supply archives page This is First Variable DC Power Supply 1. Modifying an "ATX" Type Personal Computer Power Supply To Run Your Direct Current RC Battery Charger. It endeavors to provide the products that you want, offering the best bang for your buck. In this case you get a programmable power supply able to give you up to 50v at up to … Continue reading DPS5020 and DPS3003 PSUs →. 5 Volt DC power supplies from leading power supply manufacturers. 1mm Inner(+) Diameter Barrel Connector The design/shape of the power supply housing can change without notice. This can be used as a regulated 48V DC power supply or 24 V DC power supply. In total that would be 1,5A at 5V. We’re done! Our very own 5V uninterruped power supply is ready to go. It is a good power supply circuit than IC 7805 + MJ2955 (regulator 5V 5A ). 84 as of 8/10/2019 - Free shipping worldwide on all orders. How to choose a 5V Power Supply Jameco's Power Resource Center Power supplies are one of Jameco's most popular product categories and it's no wonder. The power supply and switch assemblies were connected to the inside of the radio using a pair of wood screws. The result is a high capacity power supply that can output 3. Post navigation The first thing is you should have a different resistor between your power supply 5v rail and ground rail. First power supply circuit is built with BD139, one zener diode and a few passive components. I made it is for using it in my portable project. 7) Power ON your BBB with 5V power supply and depress power button if the BBB didn’t start automatically (may be the case with some older BBB rev version). One of the best opportunities for sound improvement of USB devices: It's amazing, how much sound improvement you can get from a dedicated low-noise USB power supply for the USB chip of a DAC and other USB devices like: external harddrives, external CD-drive, Digital-to-Digital convertors, USB headphone amps and other USB-bus driven devices. A 270 ohm resistor would give 5volts. The Koolance PSU-1000ATX-12N provides 1000W of continuous output in a smaller and lighter profile than the PSU-1300ATX-12N. Introduction Once upon a time I was shopping for lab equipment. The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack. Bricks and wall warts will supply electricity at a specified voltage up to the rated amperage. Are you looking to build your own high wattage power supply? Are you looking to build it without having to spend money?. 5V-35V Power Supply Kit This small power supply provides a regulated voltage adjustable between 1. 5V is standard USB bus power, so if the product is intended for use anywhere near a computer they will probably build it for 5. Use an ATX PC power supply as a 5V, 3. 3V regulated voltage. Regulated Power Supplies A very important part of every audio project. Here I would like to share another article with you that talks about how I have solved a slightly. The power supply and switch assemblies were connected to the inside of the radio using a pair of wood screws. A DAC is basically a computer anyway and many are powered via the computers USB (with a switching power supply). DIY Power Supply for 5V and 3. You can use any high-voltage AC power supply to drive the multiplier. ATX Power Supply, you should be able to grab one from computer shop. This took WAY longer than it should have. The LM317 regulator chip provides excellent ripple and regulation characteristics, plus current limiting and short circuit/thermal/overload protection. This article fills in information gaps for a first DC-DC power supply design. Both sides of the breadboard are fed. I want to power 25 adafruit NeoPixel LEDs. I am using the 5v off the USB connector, I see that it is very noisy. Is it possible to use an ATX power supply unit or PSU from an old PC as a bench top power supply to power 5V logic, but with some limitations. Adafruit Industries, Unique & fun DIY electronics and kits 5V 2A (2000mA) switching power supply - UL Listed ID: 276 - This is a FCC/CE certified and UL listed power supply. Due to various problems with the power supply for the RaspberryPi, a home made PSU might be a solution for some of you. You can also use this project as a DIY portable power bank. Generic DIY Retails 3. Because I want to be able to use this supply with a controller, I will use 12-bit DAC's to drive the volt and current settings. 5V power supplies (or 5VDC power supplies) are one of the most common power supplies in use today. It will be again a Raspberry Pi powered device. Troubleshooting And Repairing ATX Power Supply Brought to you by Jestine Yong Http://www. Input voltage: 6. Even though the solution seemed so obvious and easy for me, I found it's a rather big problem for dashcam owners (people go crazy with 12V batteries, ridiculously expensive BlackVue power packs, etc. Linear regulator steady flow, power tube IRF3205 0-15V 0-5A, adjustable experimental maintenance power supply With LM317 fan power supply circuit You can not fan control circuit, are generally to incr. Have just finished building a 5v dc power supply for a music server project and thought I might share here. Velleman 1A 1. 5-7V, Transformer 10A min. So to summarise, our bench power supply that we made from an old PC power supply unit in a previous tutorial can be converted to provide a variable voltage power supply by using a LM317T to regulate the voltage. Use a taped >transformer(17+17V)to control power >Dissipation of PASS TRS 2N3055. Generic DIY Retails 3. Click now to view our full-line of constant voltage LED power supplies. 31 released on April 2013. Furthermore, PowerStick provides regulated power to supply whatever Arduino Board you want. ClicksClocks Eurorack Power Supply Prototype. You must be logged in to post a review. Our favorite circuit is the following DC-to-AC inverter (click diagram to enlarge): In this AC power supply, a push-pull oscillator drives a TV flyback transformer from an old color TV (a flyback without embedded tripler). power construction 78xx IC voltage regulators step down transformer and bridge rectifier. DIY Solar Power Supply by cabuu is licensed under the Creative Commons - Attribution - Non-Commercial license or a USB boost converter (For 5V USB). 12 or 15 volts). The prices are decreasing by purchasing the power packs per pack of 3, 5 or 10 pieces. Completely flooded in a special non-conductive cooling liquid, the fan-less PSU-1000ATX-12N is superior to even "partly" water cooled and heat pipe power supplies. 2018 Online shopping for popular & hot 5v Power Supply Circuit from Electronic Components & Supplies, Integrated Circuits, Consumer Electronics, Circuits and more related 5v Power Supply Circuit like circuit supply, dc dc step down, 51 power supply, 5v ac dc. 8) If everything was correctly done, the onboard TPS65217C chip will begin charging the battery. It serves two purposes- to provide bias to the control circuitry and to provide 5V standby voltage (5VSB). It should be noted that there is no real cost advantage to building your own power supply unless you can get a large power transformer and heat sink for a super low price. When we create a DC power supply, it creates DC voltage from the AC mains voltage from a wall outlet. When calculating your power needs for a solar panel and battery, consider how many cloudy days you may have in a row. Are you looking to build your own high wattage power supply? Are you looking to build it without having to spend money?. The Micro USB port has fuses to help keep you from letting the smoke out if you feed it too much voltage, but we've taken care of that. However, you can build one yourself with about $25 worth of parts. Measure L1, 47UH (5V supply for SAA7220) 3. Be the first to review “Smraza for Raspberry Pi 3 mode B+ Case with Fan, Heatsinks, 5V/2. Dual Micro USB 3. To build a DC power supply, purchase a 3-prong AC plug. 31 - 1 / Piece, 2017, Power Supply Module, Power Supply Module. Hundreds of different 5 Volt models to choose from. 2 Volt to 14. But if you make a power. This is a simple approach to obtain a 12V and 5V DC power supply using a single circuit. com I hope that you have enjoyed the short report of “The Easy Way To Understand Switch Mode Power Supply”. Many op amps, micro controllers, and other digital ICs {integrated circuits} run off. Drew Barrymore Flower Home UPBRIGHT NEW Global AC / DC Adapter For Nextbook Flexx 11 NXW116QC264 Tablet 5V Power Supply Cord Cable PS. Simple 0 30 Volt Laboratory Power Supply The linear power supply , shown in the schematic, provides 0-30 volts, at 1 amp, maximum, using a discrete transistor regulator with op-amp feedback to control the output voltage. The most commonly available and widely used one is a small circuit board that connects above the breadboard and provides power to the voltage rails. I took the original power adapter, an USB cable and joined them to make a cord which can be connected to any USB port to charge the Gameboy. as you describe. The 5v isn't DC but that's what most multimeters will read when set to DC voltage and the signal is a 50% duty cycle square wave with an amplitude of approximately 10v. DIY Audio Articles Or a logic circuit might require 5V at 500mA. You are not expected to know the meaning of physical quantities such as voltage, current and resistance. The power supply (PSU or Power Supply Unit) is a most essential component of any RepRap, yet the information over which PSU to choose/buy for RepRap use is very much scattered around the web, in YouTube videos, and in various forums, blogs and wikis. The power supply and switch assemblies were connected to the inside of the radio using a pair of wood screws. However, you can build one yourself with about $25 worth of parts. The Power Supply Kit comes complete with through hole components to mount and solder yourself. You can select the supply voltage (5V or 3. Buy now to get the best prices with fast delivery on all STONTRONICS products. Here the PCB is designed on the EasyEDA PCB Designer and manufactured by PCBGoGo. There are a lot of wires of different colors, we are looking. You will need a used or new computer power supply unit. 1mm AC 100-240V to DC 5V Power Plug UK Transformer 55 21 AC/DC Adaptor with 1. A good power supply is essential for the proper operation of the Raspberry Pi 3 or the Raspberry Pi Zero W. The following articles in this series look at each block of the power supply in detail, but if you just want to build a 5V regulated power supply without understanding how it works, you can follow the instructions later in this article. A Rechargeable, Pocket-Sized 5V Power Supply. 39 Comments PSU's don't have 5V rails anymore?), and put it all into a nice big project box. I do not want to build my own power supply and would prefer to use something 'off the shelf' as i'm not too confident in my electrical ability. P1 for Control Volt output 2. LEDSupply is an authorized distributor of Mean Well LED power supplies, and other industry leading electronic manufacturers, like: Phihong, Magnitude and more. It came with a 9V adapter. The Breadboard Power Supply Kit is a very simple breadboard power supply kit that takes power from a DC wall wart and outputs a selectable 5V or 3. 5-7V, Transformer 10A min. There is always some voltage drop so the power supply rails will be at least +/-15V in this case. It always pleases us—and our clients—when the JS-2 is used to power a quality audio component such as a DAC or DDC (as opposed to various computers, NAS, etc. This circuit is based on IC LM7812. In fact you need 2 differents PSU: a 5v / 100mA for the filament; a variable 20 to 75v for anodes. 5V: 1000mA: 5 volt desktop power supply with USB output: AC to DC switchmode power supply with USB output socket: 12 V: 2 A. 5V-35V Power Supply Kit This small power supply provides a regulated voltage adjustable between 1. In this project, we are building a power bank which harvests energy by using a solar panel. com to instructables. *The heart of our power supplies is the SuperTeddyReg, an ultra low noise regulator which is also offered to the DIY community as a PCB or ready to use regulator. Very nice for prototyping. One corded to a Cig lighter plug, the other with a common DC power jack. Trademarks and names used in this site are used as reference and remain the property of their owners. Don't forget to share your views once you read it! What is a power supply? A power supply is a device which delivers an exact voltage to another device as per its needs. Generic DIY Retails 3. So I decided to make a good looking and cheap power supply out of cheap modules. 3V 5V + Power Supply. Use this compact component to power anything that needs juice in your DIY projects. 0 Abstract: A good, reliable and easy to use bench power supply unit is probably the most important and most used device in every electronic lab. Digital IC's, Microcontrollers, MicroProcessors and some basic circuits are generally powered by a 5V DC voltage. The power Supply must be handy as well as powerful. 5V Solar Power supply for Raspberry Pi - feasibility phase Ok, here the deal. The advantage to rolling your own power supply is that it teaches us how they work and makes it easier to troubleshoot and repair other power supply units in the shack. Before we begin, here is some background information on computer power supplies. All connector in Stable Power Module is Dronecode standard (JST GH and Molex Clik-Mate). The result is a high capacity power supply that can output 3. Home New Arrival Specials Makerspace DIY Fun Clearance Youtube Home > Power Module > Stabilivolt Module > Micro USB Interface Breadboard Power Supply Module 5V/3. For example, the micro-controller based circuits, usually the 5V DC regulated power. DIY Audio Articles Or a logic circuit might require 5V at 500mA. Power output cable (low voltage side) Optional items Mounting (screws, two sided tape, hot glue or other) Instructions See product page for wiring and product setup videos. 3V power supply lines and for ground. That is also a 5V one. How to Build Your Own Uninterruptible Power Supply. My roommate went to a local electronics supplier and recently paid 90 dollars for a 7amp 12v DC power supply. Need a lot of 5V power? This switching supply gives a clean regulated 5V output at up to 2000mA. A 270 ohm resistor would give 5volts. Measure L2, 47UH (-15V supply for TDA1541) 4. Power supply with fuse Final power supply on a breadboard Other ideas [ Update ] Both those ideas are implemented in this new power supply board; check it out! Create another supply with a different output voltage. This is useful when you want to charge or cycle a battery pack at home on the bench. A good lab power supply can run you well over $100. The 12V equivalent is calculated by converting to power at 5V, then back to current at 12V. 3V, 5V and 12V. I'm not a low level hardware guy, but a software guy. Power Supply Basics. The 3300 ohm resistor is a pull down for the On/Off pin to keep it on with power in. The D112 Power Supply is a high quality Eurorack power supply designed for a single row of modules. A community dedicated to helping everyone learn the art of audio. If you need a cold start (start from battery without any external power connected) there is a small button. Any ATX power supply can be plugged into the adapter. 1mm AC 100-240V to DC 5V Power Plug UK Transformer 55 21 AC/DC Adaptor with 1. This power supply uses combined regulation of +5V and +12V. The circuit also incorporates an electronic output current limiter that effectively controls the output current from a few milliamperes (2 mA) to the maximum output of three amperes that the circuit can deliver. This is useful when you want to charge or cycle a battery pack at home on the bench. The maximum input to this DC variable power supply is 37 volts. Very nice for prototyping. Though our 5V power supplies are more complex than linear benchtop power supplies, our high-performance switched-mode power supplies are quiet and well-regulated. So keep it disconnected from ground. If a 120vac power adapter is used, the circuit will also work for 120vac power lines. But your 5V power source absolutely can supply the correct amount of power to three 5V devices, if they're wired in parallel, and presuming your power source can supply enough Amperage without failing. Measure L3, 47UH (-5V supply for TDA1541) 5. 12V dc power supply schematics. One more fun feature-- since it uses a 5V DC supply, you can use the Team Tesla to power a few pedals with your laptop for wireless power! You'll want to limit it to two outputs, probably, but it's a pretty neat thing when you're out and about!. Computer power supply units (PSU) deliver the power to the PC hardware via a number of cables with connectors. 1" headers are mounted on the bottom of the PCB for simple insertion into a breadboard. It has a standard generic IEC power inlet. Here is my design: Power comes from AC/DC adapter to the battery charger. 5V Power Supply using 7805 Voltage Regulator with Design By Manoj Shenoy Electronics , Power Supply 16 Comments In most of our electronic products or projects we need a power supply for converting mains AC voltage to a regulated DC voltage. I have been long thinking how I could reduce its size and finally I realized that I don’t need an extra box around the power supply, I can mount the connectors on its original enclosure. Typically they provide the remaining power from the Raspberry Pi (that isn't being used to run the board itself). 3v 1a module board for arduino diy sale online store at wholesale price. I'll try to show in a very simplified way how a switch mode power supply works and how to change the feedback circuit so the power supply outputs the voltage you want. if you need a +5V supply, then 7805 voltage regulator can be used. Here I would like to share another article with you that talks about how I have solved a slightly. Any switched-mode power supply that gets its power from an AC power line (called an "off-line" converter) requires a transformer for galvanic isolation. It is a 3-terminal (+ve) voltage regulator IC. To deliver 20W you will thus need a power supply that can deliver 15V x 3. 3V instead of 5V. Here I made a second 5V boost converter circuit by using another IC which is very small than the previous one and it only have 6 legs instead of 8 legs. High-end Eurorack Power Supply. Don’t forget to share your views once you read it!. Provides visual indication when supply is plugged in and turned on, also fuses the power voltage outputs for safety. in: Industrial & Scientific. The Raspberry Pi 3 is powered by a +5. Find great deals on eBay for diy power supply kit and diy power bank kit. Adjustable Power supply PCB One way to avoid high dissipation levels is to use a lower voltage transformers when needed output voltages are low. 12V BD139 power supply circuit. Device Selection Once the initial specs of a DC-DC design are selected (e. Meet the individual needs of your DIY, but you must understand basic electronic assembly. The output power of a supply I feel that this cost saving is a false. My idea is that since I want continuous power supply, I don't really need 9V to charge the battery. This article fills in information gaps for a first DC-DC power supply design. Firstly, the DPS5020 power supply comes in 2 parts, the main controller and a front panel. So your power supply the other side of the 5V regulator would see I = P/V = 4/12 = 0. All customers get FREE UK Delivery on orders over £20 dispatched by Amazon ELUTENG 5V 1A Power Supply 5. It serves two purposes- to provide bias to the control circuitry and to provide 5V standby voltage (5VSB). Power supply kits. It can also work with a two-prong AC plug. It came with a 9V adapter. 4V so can be set for any device requiring voltage and current in that range. 25, buy best robotdyn® breadboard power supply 5v/3. 37 Responses to 0 - 24 Volt, 2 Amp Bench Top Power Supply. The main issue with the VFD display, is the power supply. If you have already used another dc/dc converter in your circuit then you can use its switching node and discrete capacitors and diodes to create a low power charge pumped output. It helps us to design the sections of the circuit individually and then at the end put them together to have a complete circuit, ready for use. 3V 5V Solderless For Arduino IoT DIY Pi $3. However, some projects do call for greater or more complex power needs, which is why the Breadboard Power Supply has been built to cater to almost any breadboard project's power needs. How to Build a Switch Mode Power Supply Circuit with an MC34063. I came up with the idea to post this mini project because my roommate needed a power supply to power leds and also 12v fans. Output voltage: 3. Whereas most power supplies simply provide a single consistent voltage, this power supply can output both 3. PowerSupplyRepairGuide. My roommate went to a local electronics supplier and recently paid 90 dollars for a 7amp 12v DC power supply. Article written by. 84 as of 8/10/2019 - Free shipping worldwide on all orders. Before we begin, here is some background information on computer power supplies. You must be logged in to post a review. There are different types of power supply circuits based on the power they are used to provide for devices. 3V 5V +-12V the advantage of newer power supply circuit of use which commonly seen in low quality diy. The following is a list of our available electronic DIY kits with pricing and power supply: 2 1. 3V and 5V simultaneously on two different rails. The Power Supply will be an Arduino UNO Power Supply Shield which will output multiple voltage range such as 3. 7) Power ON your BBB with 5V power supply and depress power button if the BBB didn’t start automatically (may be the case with some older BBB rev version). The Buck switching regulator is a type of switch mode power supply circuit that is designed to efficiently reduce DC voltage from a higher voltage to a lower one, that is it subtracts or “Bucks” the supply voltage, thereby reducing the voltage available at the output terminals without changing the polarity. Source from Shenzhen King Joining Tech Co. D112 Power Supply. How to build your own Power Supply. I plan to have 5V/2A cables from the electric box to the camera locations. I use this power supply regularly to power my embedded projects in the lab. 5v and 12v dc dual power supply circuit using IC 7805 and 7812. The power consumption of the Raspberry Pi is very low but it is advisable to have at least 2A (10W). This circuit can take power from a DC wall wart of 5-10V and outputs a selectable 5V or 3. You will need a used or new computer power supply unit. Linear Power supply 5V 5A using 7812, LM723. The power Supply must be handy as well as powerful. This DC output is very useful to power microchips and different ICs. 5V-35V Power Supply Kit This small power supply provides a regulated voltage adjustable between 1. com I hope that you have enjoyed the short report of “The Easy Way To Understand Switch Mode Power Supply”. Power Supply Basics. I’m testing this setup here using my dash camera while connecting and disconnecting external 5V power supply to the relay (i. Good Combination - 830 Points MB102 Breadboard + Power Supply Module 3. If you have a project that needs a bit more than 3. Dedicated PSU's are costly, so in this post we will show you how to make a cheap DIY PC/server PSU for chargers and workbench. P1 for Control Volt output 2. In a lot of ways, this is incredibly useful, but it can lead to some confusion. com to instructables. Just remember that the socket housing is the ground and the two wires in the base are to be attached to the 5v rail. DIY Kits, Digital Audio Source Convertor, Phono Stage Amplifier, Preamplifier, Power Amplifier, Headphone Amplifier, Speakers. It came with a 9V adapter. Buck Switch Mode Power Supply. LM7812 power supply schematic. Peak current is 3. Voltage regulation is achieved by varying the ratio of on-to-off time (also known as duty cycles). The coil 1-15 works in flyback mode- it conducts when Q1, Q25 are OFF. Their generic specifications for various desktop systems are defined in Intel's design guides, which used to be periodically revised. In this video I show you how to make a 5V USB power supply cable. The Small Supply / Bus is a combination of a power supply and a busboard with eight connectors for Eurorack modules. 8M) Linvox power cord, and is available with US/CA/MX/JP (Type B), EU (Type E), and AU/NZ (Type I) plug types. Buy now to get the best prices with fast delivery on all STONTRONICS products. Shop with confidence. This DC output is very useful to power microchips and different ICs. L7805 Step Down 7. 3V and 5V simultaneously on two different rails. as you describe. 5V 2A DIY Dual USB Power Bank Shell Box Portable 8x18650 External Battery Power Bank Case with LCD Display (No Battery) WhiteLED indicator - Showing charging status and on/off status. P = IV = 5 x 0. 85 Trending at $5. I finished the prototype of the power supply (PSU). Modular power supply from 1 to 6 channels (I have implemented 4 channels: 3 positive, and 1 negative) Each channel can independently be set from 0-12V (for positive channels) or -12-0V (for negative channels), and the output can go all the way to 0 (which is not the case with most DIY power supplies). It can supply 625mA at +12V and 625mA at -12V using a DC-DC dual-output module. Here we begin by discussing the drawbacks of capacitive power supply circuits and learn how they may be upgraded to form the ultimate "transformerless" power supply, which may be as effective as its other counterparts, yet will be very cheap to build (hardly 30 cents), as well as compact and lightweight. DIY Laser 2011-09-19. It can also work with a two-prong AC plug. 2A Universal AC Power Supply at Best Buy. As we all know, the Raspberry Pi doesn't really use that much power (5v + 700mA is the spec). Power supply form the basic building block of any electronic circuits and therefore its important to familiarize the DC power supply circuit construction. In total that would be 1,5A at 5V.