Cheap USB LiPo charger notes

Cheap USB LiPo charger notes

Measuring Solar Radiation Introduction Industrial grade devices for measuring solar radiation are delicate and expensive. The “pyranometer” is basically a flat plate covered with a transparent dome that is coated with an extremely absorptive surface. As the sun strikes it, the surface gets hot. The temperature of the surface is measured with a thermopile, giving an output voltage related to the amount of solar radiation striking the surface. You can build a “poor man’s” pyranometer that works pretty well out of inexpensive and readily available components. Although it will not be of laboratory quality, it will suffice for comparative measurements and educational purposes. Making the Meter The obvious component to consider as the basis for our meter is a silicon photovoltaic cell. When sunlight strikes it, it produces electricity, and the more sunlight strikes it, the more electricity it produces. At first glance, you might think that you could just hook a voltmeter up to it and measure the output voltage.

Measuring Solar Radiation

I ended up using it in the living room, it provides enough power and burns only 0. So on to the problem: I need to use it with 2 sources and having an additional one for the fellow guests to plug in the phone is useful.

Back to the GEO Home Page Musical Instrument Tube Amp Building, Maintaining and Modifying FAQ. Much of this material applies to building or re-building hi-fi equipment, as well but it was originally intended for musical instrument crazies.

Relocated MAT sensor shown on Rusty’s air tube. Installed in the top of the intake manifold. Testing is the same as the CTS. Make sure engine is WARM. Pretty much the same thing as the CTS, but based off incoming air temperature. Basically – this sensor functions by providing a resistance-to-ground circuit that the computer ECU uses to determine how much fuel the engine requires. The hotter the air in the intake manifold – the lower the resistance.

Build a USB Powered AA NiMH and NiCd Battery Charger

The following instructions are for creating a MegaSquirt to Relay Board cable. It is for those who are creating their own harness. With both boxes mounted, measure the distance between them from DB connector to DB connector – this will be the length that you will cut the individual wires. If you are not using a Relay Board, allow enough length in each of your wires to reach the target component.

A high voltage probe allows an ordinary voltmeter to measure voltages that would otherwise be too high to measure or even destructive. It does this by reducing the input voltage to a safe, measurable level with a precision voltage divider circuit within the probe body.. Probes intended for up to kV typically employ a resistor voltage divider, with an input resistance of hundreds or.

This instrument will let you check to see if there is voltage present on a circuit. By doing so, a multimeter can help you achieve a variety of useful tasks, such as measuring ohms, volts, and amps. This has the arc-shaped scales visible through the window and a pointer which will indicate the values read from the scale. These determine the ranges of magnitude. A wider mirror-like surface shaped like the scales might also be present.

The mirror is used to help reduce what’s called “parallax viewing error,” by lining up the pointer with its reflection before reading the value the pointer is indicating.

DIY Ignition Coil Driver

Stage and show lighting Lighting is important in theatre and shows. Lighting allows us to see the performers. Lighting provides a tool for setting moods and tones of scenes on stage. Different type of performanced have different lighting needs.

9) Work in a well-lighted area – this is hard enough to do correctly even when you CAN see what you are doing. 10) Crimped vs. soldered connections – with a decent .

Tube Stuff Suppliers Appendix B. Tube amps have always been the amplifier of choice for the working musician. Musical myth has ascribed almost magical tone to them. While the results may not be entirely magic, tubes do have a sound that is different from solid state amplifiers, and one that happens to make amplified music sound better to the human ears and brain.

There are lots of technical and psuedo-technical explanations for why this should be true, but there is enough solid evidence that it is a real effect to trust it. The real reason to use tube amps is simply that they sound better. For that advantage, we put up with the poor supply of parts, high prices, fragility and excess heat that they produce. Are Tube Amps louder than solid state amps of the same power? Some excellent scientific work on tube preamplifiers and their distortion products has turned up the mechanism for this.

When tubes are driven outside their linear region, for the first 12db or so of overdrive the harmonics that they produce trick the human ear into thinking that the sounds are getting louder, when in fact the sound is getting progressively more distorted. It is this acoustic trick that can make tube amps sound up to 12db louder than they actually are compared to a perfect, undistorted amplifier. A solid state amplifier of the same power as a tube amp may distort at the same signal level as the tube amp, but the distortions are not subtle, and we hear them as distortion, not as a slightly louder sound.

Test probe

The top of the cabinet was divided into two separate hinged sections. Raising the right side revealed the AM radio tuner — with illuminated dial, and dark brown Bakelite knobs. Under the wider, left side, the turntable was accessible.

Located on firewall behind valve cover. To test, using a voltmeter with the ignition on/engine off, voltage at terminal B should be 4 – 5 volts.

The 9 cap is available at your local GM dealer. Ask for AC Delco type RC32 part and a 10 cap is available at most autoparts store under a Stant part number , if they don’t have it, have them order it for you. The lower pressure rated caps are not carried by the store much but they are available. Wright One item that makes the radiator leak is using the wrong Pressure Cap. Should be 9 pounds no greater than 10 pounds. Therefore I use a 7 pound cap for many years. Also your coach is running much Many fan clutches do not work properly Duane Temperature Sender This may be old news for most but doesn’t hurt to be told.

This has caused a lot of engine damage when engine starts to overheat. Since the standard pressure cap raises antifreeze solution boiling point to degrees this will be more accurate readings.

Kubota M8540 Workshop Manual

Charging with a Power Supply Learn how to charge a battery without a designated charger. Batteries can be charged manually with a power supply featuring user-adjustable voltage and current limiting. I stress manual because charging needs the know-how and can never be left unattended; charge termination is not automated. Because of difficulties in detecting full charge with nickel-based batteries, I recommend charging only lead and lithium-based batteries manually.

Lead Acid Before connecting the battery, calculate the charge voltage according to the number of cells in series, and then set the desired voltage and current limit.

The Patterson PR was a “Los Angeles-built,” superheterodyne communication receiver that was produced early enough to have many unique or, at least, unusual design features.

The best ways to control ringing on very long transmission lines are source termination, end termination, and both-ends termination. The both-ends termination is supremely tolerant of imperfections within the transmission system and within the terminators themselves. Rate this link Choose termination and topology to maximize signal integrity and timing – Termination techniques improve noise margins and reduce signal reflections, but they require that you balance trade-offs among conflicting goals.

Understanding your choices and their design impact helps you produce a more reliable and cost-effective design. Rate this link Clock-jitter propagation – Many control systems exhibit a resonant peak between their tracking and filtering ranges. Rate this link Constant-resistance equalizer – This article describes how to combines a good termination with a useful equalizing function. Rate this link Constant-resistance termination – Constant-resistance termination occasionally sees application in digital systems as a terminating network.

As long as you scale the components correctly, the rate of decrease in the admittance of the R-C leg precisely matches the rate of increase in the admittance of the L-R leg. The result is that the impedance, Z f , of the whole circuit remains constant at all frequencies. At least, it remains constant until some limit above which the parasitic aspects of the circuit take over and the C and L components no longer behave like Cs and Ls.

Rate this link Differential-to-common-mode conversion – Any unbalanced circuit element within an otherwise well-balanced transmission channel creates a region of partial coupling between the differential and common modes of transmission at that point. The coupling can translate part of a perfectly good differential signal into a common-mode signal, or vice versa.

Such differential-to-common-mode-conversion problems frequently arise in the design of LAN adapters. Rate this link Driving two loads – The split-tee configuration conveniently drives two CMOS receivers from one output.

Mazda CX-7 2007 Workshop Manual

This project was constructed while that call was valid, and you may observe references to it. The RF Probe is one of the handiest accessories you can have around the shack. Using only 3 electronic components, it may rank as one of the simplest and cheapest homebrew projects. When used with a high-impedance DC Voltmeter, it can be used to measure RF voltage and power , trace RF signals in a new design, and troubleshoot malfunctioning RF circuits.

It has its limits, of course, and we’ll discuss those here. But once you understand how it’s used, and how easy it is to build, you’ll wonder why you never built one before.

Enduring Association with Radio. Growing up in the s, my maternal grandparents owned a RCA Victor model 77V1 AM radio-phonograph top of the cabinet was divided into two separate hinged sections.

My toolbox has an LED tester and magnifier light, so why not add a convenient 5V regulator cap to the collection? There are nicer ones on the market that have surface mount components, but half the fun of an electronics hobby is creating something basic in your own style. This double-decker board with flashing LED power indicator allowed me to experiment with flush battery snaps and board interconnects.

Mercury Battery Replacement Regulator Several decades ago, mercuric oxide button cells were common consumer power sources. Mercury was phased out due to environmental concerns, leaving behind vintage photographic equipment and watches that were incompatible with alkaline’s wide voltage change or silver-oxide’s slightly higher nominal voltage. Tinkerers have come up with a variety of solutions for many devices.

Evil Mad Scientist Laboratories

August 29, So… you just want to light up an LED. What resistor should you use? Maybe you know the answer, or maybe everyone already assumes that you should know how to get to the answer. What kind of LED are you using? Part of a larger circuit? Playing with LEDs is supposed to be fun, and figuring out the answers to these questions is actually part of the fun.

For example, you can insert a voltmeter into the LED circuit so that you can measure voltage. In this case, the voltage is measured across the battery. It should read in the vicinity of V. (9 V batteries rarely provide a full 9 V.).

Otago Daily Times Filed Under: ATV Utility Vehicle Hunting Buggy – The rear electric atv motor is visible mounted on the rear axle of the Barefoot Motors electric ATV prototype Electric all-terrain vehicles may not impress the dune-and trail-riding crowd that rides for recreation, but a few small companies expect organic farmers and vineyard growers will pay a premium to gather cattle and spray vines without the carbon footprint of a gas vehicle. While automakers are toiling to produce electric cars that will fit the demands of American drivers, Ashland-based Barefoot Motors is on the verge of turning out heavy-duty electric ATVs that can go 50 miles on a charge costing about 90 cents.

She’d like to haul her spraying equipment without fogging the vines with exhaust fumes, and the electric ATV motors could get free power from the vineyard’s solar panels. It’s even more cost-efficient for farms producing their own power from solar panels or manure digesters, and as gas prices go up. Barefoot is not the first electric ATV coming to market. Bad Boy Buggies in Natchez, Mississippi, has vehicles intended for hunters. The high price of Barefoot’s model comes from the lithium iron phosphate batteries, the same technology General Motors is putting in the Chevrolet Volt electric car.

Some have gone to underground mining operations and electric utilities where the lack of exhaust and short turning radius are a plus. But Scheder-Bieschin said customers don’t have to compromise on performance, as long as their needs fit the vehicle.

How Do You Connect A Voltmeter To Measure The Potential Difference?

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