s243a added: Secondary (Rechargeable) Batteries Select between maximum runtime, long service life, small size and low cost. Rechargeable batteries play an important role in our lives and many daily chores would be unthinkable without the ability to recharge an empty battery. As the battery improves, an increasing number of devices are fitted with rechargeable batteries. The points of interest are good runtimes, economical price, long life, large loading capabilities, safe operation, ease of storage and disposal. The most common rechargeable batteries are Lead acid, NiCd, NiMH and Li-ion. Lead Acid – This is the oldest rechargeable battery system. Battery research gravitates towards lead- and lithium-based batteries. Unique packaging has made Li-ion available and affordable. Table 1: Characteristics of commonly used rechargeable batteries. Combining cobalt, nickel, manganese and aluminum raises energy density up to 250Wh/kg. Last updated 2015-08-14 *** Please Read Regarding Comments *** Or Jump To A Different Article Comments Dr wrote:
How to Build a Reciprocal Roof Frame | Reciprocal Roof Construction A reciprocal roof frame This is a long-delayed post about building my reciprocal roof frame. This entry documents the details of building my reciprocal roof frame, including the type of wood I used, the number of rafters, and the work process itself. I hope that this will be useful for individuals who want to attempt building a similar frame. With the general lack of information about reciprocal roof construction on the internet, I hope this will become a primary resource. Here we go… Raising the reciprocal roof A reciprocal roof is a beautiful and simple self-supporting structure that can be composed of as few as three rafters, and up to any imaginable quantity (within reason, of course). My Reciprocal Roof Frame Here are some specs of my reciprocal roof frame: 14 primary raftersBlack locust poles except for one pin oak (used green)All rafters have a diameter of roughly 5″ at the top end of the poles (heavy!) In total, the roof frame is composed of 28 poles. The Charlie Stick Heavy poles!
Power Supplies - Page 4 of 18 24V SCR Battery Charger by Jim Keith | This is an extension of the earlier 12V SCR Battery Charger. It is surprisingly easy to increase the output voltage to 24V, but there are both obvious and subtle differences to consider. 12V DC to 220V AC Inverter by joribo | by Georg Böhmeke The internet is full of such schematics, so this project is nothing special. 12V DC to 220V AC Inverter Circuit by P. This is a quite simple DC to AC inverter that provides 220VAC when a 12VDC power source is provided. 12V Lead Acid Battery Low Voltage Indicator by GaryC | This is a simple circuit that will indicate a low voltage on a 12V lead acid battery. 12V to 6V Converter with 7805 or LM309 In this schematic is presented a simple 12 Volts to 6 volts converter circuit that is built with the well-known 7805 voltage regulator or the LM309 IC. MCP73826 500mA Lithium-Ion Battery Charger Battery Reverse Polarity Protection in LV Applications 3 Volts DC to 5 Volts DC Converter by T.K. by Edgefx Kits |
Brian Kerr's router lathe Brian Kerr writes: Hi Matthias, I thought you might be interested in seeing another application resulting from your gear generator. I’ve been thinking about a marble machine for a while and as part of it I wanted to have one way of lifting the marbles be done with an Archimedean screw. For that and other projects I wanted to make a machine that would cut helical spirals. At first I considered a separate machine using the same small router I have for the 3D pantograph from your design. Here’s the finished jig – or at least the first prototype: Headstock attachment point. It attaches to the tailstock end using threaded holes intended for an extension bed. The “carriage” for the router rides on metal electrical conduit pipes – straight and inexpensive. The first layer on top of the carriage is the “coarse” setting for the diameter of the blank. The next level is a rotatable piece which will allow the router bit to enter at an angle if the project requires. Matthias commets: See also:
Series and parallel wiring: Successfully compounding amps and volts by Rex A. Ewing from the January/February, 2006 issue of Countryside & Small Stock Journal - Countryside Magazine When I began putting together my first solar electric system way back in the last century, I soon noticed there was an easy part and a hard part to the installation. The initial tasks-welding the heavy steel frames for the solar panels, digging and pouring the concrete foundation piers, mounting the frames and the panels, building a battery box from plywood and 2 x 4s and lifting in and arranging the octet of 80-pound batteries-all fell into the easy category. The hard part came when I had to figure out how to wire eight 6-volt batteries and six 12-volt solar panels for 24-volt operation. Up to that time my most noteworthy accomplishment with DC electricity was rewiring the lights and brakes on an old horse trailer, after my new puppy had endeavored to sate her chewing urge on the original wiring. Frankly, I was beginning to think I was in over my head. In the end-when I got the system up and running without frying any solar panels or blowing up any batteries-it all made perfect sense.
Downloads Collected on this page are all of the downloads for the clocks. This includes the drawings for the clocks in PDF format which are available for free. Simply click on the highlighted link under Free Files. You will need to have Adobe Acrobat loaded for the files to be opened so if you don’t have it you will need to get it loaded. You will need to wait a few seconds for anything to appear but be patient it will appear. The premium files are arranged under the clock headings and offerings vary for each clock. To obtain the files click on the PayPal button which will take you to a PayPal page which will give you the opportunity to pay either by PayPal or Credit Card. Having completed the details you should be taken to a page from which you can download the files. I should in fairness point out that these clocks are not easy to build and can be a challenge, particularly if you don’t have all the kit needed to build them. For more free files go to the Projects Tab Materials source McMaster-Carr
Solar Power System Design - Battery Bank Solar Power System Design - Battery Bank Hardwired Equalization Of The Solar Power System's Battery Bank Battery Replacement is the single biggest expense in maintaining a solar power system. If you wire your battery bank correctly and use a correctly designed charge controller, you can double the life span of flooded lead acid batteries. For the price and availability, we are recommending flooded lead acid batteries, specifically, RV/Marine batteries. One little known fact is how to properly wire a battery bank. Because this technique is generally unknown, electrical engineers have been forced to design charge controllers with "Maximum Power Point Tracking" (MPPT). If these were 6 volt batteries, connecting between the red and blue wires would give you 24 volts (6 volts times 4 batteries in series). All the solar power system installers we have interviewed or reviewed through their websites so far are connecting battery banks "The Wrong Way" as shown on the right.
Remontoire for Woodenclocks After developing the design of the Woodenclocks Gravity escapement to the point where it was working quite accurately I had started to think if there might be something else I could do with the clock design to improve the the overall efficiency of the clocks. I had always had problems with the gear train working smoothly and consistently, so this seemed a reasonable area to look at more carefully. By the nature of a clock the gear train is going to have to start and stop with each action of the escapement, so when the escapement is engaged, the gear train stops moving and when it releases it will start moving again, this happens with every tick of the clock. The problem here is that each engagement of the escapement involves a certain amount of friction, and two types of friction at that. Remontoire action One the ways to reduce the static friction in the drive train is to introduce a remontoire , the simplest type of remontoire invented by Robert Robin in 1772. Conclusion
Connecting Your SLA Batteries Together Home / Sealed Lead Acid / Connecting Your SLA Batteries Together Battery packs are configured to suit their proper voltage (power) and amperage (runtime) by connecting its individual SLA batteries in different ways. A single battery holds a fixed voltage and amperage on its own, and when multiple batteries are combined in different ways to form a battery pack that generates the desired rating. Increasing the voltage in a Series configuration is often used in golf carts, sweepers, scrubber, marine and other application. Configuration 1 – Doubles Voltage, Amps Remain the Same Series is the connection of two matching batteries used to double the voltage and keeping the amp-hour the same. Configuration 2 - Double Voltage, Double Capacity Series/Parallel is configured by connecting four matching batteries. Configuration 3 – Double Voltage, Capacity Increased by 3x’s Series/Parallel - in this configuration you have connected 6 batteries to double the voltage and triple the capacity.