Power transformers may be obtained from old radios, which can usually be obtained from a thrift store for a few dollars (or less!). The radio would also provide the power cord and plug necessary for this project. Line cord switches may be obtained from a hardware store. If you want to be absolutely sure what kind of transformer you’re getting, though, you should purchase one from an electronics supply store. If you decide to equip your power supply with a fuse, be sure to get a slow-acting, or slow-blow fuse. Transformers may draw high “surge” currents when initially connected to an AC source, and these transient currents will blow a fast-acting fuse. Determine the proper current rating of the fuse by dividing the transformer’s “VA” rating by 120 volts: in other words, calculate the full allowable primary winding current and size the fuse accordingly. Lessons In Electric Circuits, Volume 2, chapter 1: “Basic AC Theory” Lessons In Electric Circuits, Volume 2, chapter 9: “Transformers”

This project involves the use of dangerous voltages. You must make sure all high-voltage (120 volt household power) conductors are safely insulated from accidental contact. No bare wires should be seen anywhere on the “primary” side of the transformer circuit. Be sure to solder all wire connections so that they’re secure, and use real electrical tape (not duct tape, scotch tape, packing tape, or any other kind!) to insulate your soldered connections.out ac unit not working If you wish to enclose the transformer inside of a box, you may use an electrical “junction” box, obtained from a hardware store or electrical supply house. make window ac unit more efficientIf the enclosure used is metal rather than plastic, a three-prong plug should be used, with the “ground” prong (the longest one on the plug) connected directly to the metal case for maximum safety.price for window ac unit

Before plugging the plug into a wall socket, do a safety check with an ohmmeter. With the line switch in the “on” position, measure resistance between either plug prong and the transformer case. There should be infinite (maximum) resistance. If the meter registers continuity (some resistance value less than infinity), then you have a “short” between one of the power conductors and the case, which is dangerous! Next, check the transformer windings themselves for continuity. With the line switch in the “on” position, there should be a small amount of resistance between the two plug prongs. When the switch is turned “off,” the resistance indication should increase to infinity (open circuit—no continuity). Measure resistance between pairs of wires on the secondary side. These secondary windings should register much lower resistances than the primary. Plug the cord into a wall socket and turn the switch on. You should be able to measure AC voltage at the secondary side of the transformer, between pairs of terminals.

Between two of these terminals, you should measure about 12 volts. Between either of these two terminals and the third terminal, you should measure half that. This third wire is the “center-tap” wire of the secondary winding. It would be advisable to keep this project assembled for use in powering other experiments shown in this book. From here on, I will designate this “low-voltage AC power supply” using this illustration: Schematic with SPICE node numbers: Netlist (make a text file containing the following text, verbatim): 2-Year Drops & Spills Protection 2-Year Camera Accident Protection Plan 8 used & new from Nikon 27018 EP-5A Power Supply ConnectorDetailsNikon 27055 EH-5b AC Adapter Requires EP-5a Power Supply Connector FREE Shipping. Buy "Nikon 27018 EP-5A Power Supply Connector” from Amazon Warehouse Deals and save 25% off the $45.95 list price. 4.53 x 1.97 x 1.08 inches Kapaxen EH-5 Plus EP-5A AC Power Adapter Kit for Nikon Coolpix P7000, P7100, P7700, D3100, D3200, D5100, D5200 Digital Cameras

Nikon 27055 EH-5b AC Adapter Requires EP-5a Power Supply Connector Nikon EP-5 Power Supply Connector for EH-5 AC Adapter 1.1 x 2 x 4.5 inches 10.6 ounces (View shipping rates and policies) #524 in Computers & Accessories > Tablet Accessories > Chargers & Adapters See all 32 customer reviews See all 32 customer reviews (newest first) It did what it was supposed to do. Power supply connection works great, connects with transformer and provides t he juice I hoped it would. I purchased a Nikon D3300 in order to be able to shoot HD video with my collection of NIkon lenses. Don't even get me started on realizing that more than half my lenses won't auto... Works just fine ! I, too, bought this for my D800 on the basis that the product was described as compatible. how that I have it, it absolutely is not compatible. Did not get the whole product and very upset Haven’t use it yet, but I’m sure it will work fine, thx, Robert

Has been working well! Nikon 27126 EN-EL 14A Rechargeable Li-Ion Battery (Grey) Nikon EP-5B Power Supply ConnectorHomeElectrical SuppliesPower Supplies & AC/DC These durable, reliable power supplies and AC/DC converters from BK Precision are ideal for telecommunications, general electronic field service, school electronics, laboratory testing, powering up hobbyist's projects, and many other applications. For the DC Switching supply, choose from three different models to meet your DC voltage needs. What's the difference between AC, DC power? AC Power vs DC Power [Insert joke about the rock band here] You've probably heard the term “AC/DC” and figured it had something to do with electricity, but maybe you didn't know much else. If you ask any random person you meet about electricity, they may give an answer like “It's that magical lightning stuff that makes my lights turn on and my computer do things,” and if they want to sound smart they may include an anecdote about Benjamin Franklin flying a kite with a key tied to it during a lightning storm.

Which, of course, is why instead of power lines, we all have kites with keys tied to them attached to our houses, just waiting for that stormy day to give us our much needed power. If you ask any random person you meet about AC/DC in particular, there's a 99% chance they'll mention the Australian rock band that gave us such thought-provoking hits as “Highway to Hell”, “Hell’s Bells” and probably some other songs with Hell in the title. Fun fact: the band's name comes from the sister of band members Malcolm and Angus Young, who saw the initials on a sewing machine. To the band, it symbolizes the “raw power” of their music. There, now you have something to talk about at your next social gathering. But for realsies, what's the actual meaning behind AC/DC? What's the difference between them? Well, you're here already, so we may as well tell you. What is AC Power? AC stands for alternating current, which means the electrical current frequently reverses direction.

AC electricity is measured according to its cycles, with one complete cycle being counted each time a given current travels in one direction and then doubles back on itself. Like it's doing laps in the most dangerous swimming pool ever. An electrical current is able to complete many cycles per second, and is then given its frequency rating based on that number. The unit of measurement for an electric cycle is “Hertz” (Hz), not to be confused with the Hertz Donut (Hz DnT), which is not nearly as delicious as it sounds. The typical frequency in North America is 60 hertz (Hz), which indicates that the current is performing 60 cycles per second. In Europe and many other countries, they usually stick to 50 hertz. Shut up, that's why! No, I dunno, it's probably the same reason they spell some words differently in the United Kingdom. AC power is the type of electricity most commonly used in homes and offices, and is extremely versatile because its voltage can be changed through a transformer to suit a variety of transmission needs.