Dave has made an excellent video tutorial on building and using Dickson voltage doubler made if diodes and capacitors. This appears to be a cheap and easy way of rising voltage for low power applications. For instance, if you microcontroller circuit is powered from the 3V power supply and you want to attach 5V LCD, it may be useful to consider a voltage double to increase supply voltage instead of designing additional power supply branch. In the tutorial, there are real measurements made with different loads attached. [source]
I bet you face lots of problems in design process where you simply need to test power supply, or LED by providing/drawing constant current regardless to voltage change. Such device is called a dummy load. You can find lots of DIY dummy load projects and we won’t be talking about commercial ones right now. Nick found out that most DIY dummy loads tend to be complicated or unavailable. So without struggling he decided to start his own simple and reliable load. He wanted it to be simple, self powered and indestructible. Indestructible means that it won’t burn in voltage range up to 30V. With BTS141 FET this became possible as it has built in over-current and over-voltage protection built in. Controlling is done with simple potentiometer attached to operational amplifier positive input. Negative input is connected from current sense resistor. The project is OSHW which can be found on github as re:load. [source]
A Fractal receiver is a receiver that can be damaged up into lesser parts. Fractal just means a part of, so in this scenario they are referring to a receiver that can have feelers added or aloof. By liability the Fractal receiver is next a notion called the self-similarity expect module. This typically means that you can detach or add in peer parts. If you ever took a lobby in Fractal Geometry, you’d learn the mathematical reasoning behind this. The mathematics behind this stunt is governed by the Mandelbrot Set. Benoit Mandelbrot is the father of fresh day Fractal Geometry. These antennas activate by elate out rare electromagnetic signals that face a certain zone or size depending on how many Fractals the receiver itself has. Fractal Antennas aren’t outsized or awkward by any way. In detail they are very small and have legal world application in cellular phones or microwave ovens and other small electronic method. This receiver is rare in that it can activate at countless different frequencies at the same time.
ATG airfield obstruction lights are specialty lights set up on runways and helipads at commercial airports as well as private airfields. These facilities are required by law to provide this equipment to illuminate objects that pilots may not see when taking off or landing planes at night. According to Federal Aviation Administration rules, obstruction lights need to be a certain height, wattage and distance apart. Due to concerns over rising energy costs and environmental impact, many airports are now adopting solar-powered obstruction lights as greener and more economical alternatives. The Need for Obstruction Marking The FAA sets standards for obstruction lighting installation, and airports that are not up to code risk fines or even temporary closure until the problems are corrected. Standards for this kind of airfield lighting are strict for safety reasons. Pilots need to be able to see all objects that come close to an aircraft’s path even on an overcast, moonless night. Failure to do otherwise could result in serious property damage, plane damage or even injury to those on board. Obstruction lights are installed in self-contained towers spaced at uniform intervals. The number of these towers required normally depends on the total size of the airfield.…
Computer is number one tool in engineering, manufacturing and production. When you need some mobility – Laptop is best choice. We all know that computers are packed with electronics that generate heat, may break easily when dropped and even can generate spark. How about using them in explosive areas where gases, chemicals and dust is present? Using regular computer would be suicidal. No doubt – a special gear is required. Some companies like Ecom instruments Ltd manufacture electronic devices to work in hazardous and explosive areas. Intrinsically safe laptops are on top of the list. Teir current model Getac V100 – EX2 is specially designed and ATEX (Atmospheres Explosibles) certified to be used in dangerous areas. It is pretty challenging design intrinsically safe laptop because it is complex device which has moving monitor, keyboard, bunch of interfaces. Everything has to be rugged, sealed from water, dust and withstand drops, shocks and still be convenient to use. Case is built using magnesium alloy with caps on every port and slot. HDD is also shock protected. It has a touch screen with good visibility even in direct sunlight. It can be easily transformed in to tablet to carry around conveniently. Despite there…
A power supply is an essential part of every electronic device. The whole system relies on it. If a power supply fails – device dies too, and there is a chance that sensitive parts may be damaged. Power supply solutions vary from device to device. They may work using different techniques depending on needs. Tim have described probably the simplest power supply solution which converts Alternating Current (AC) to Direct Current (DC). Supply circuit consists of well-known parts that are – transformer, which transforms voltage from 230V AC to 12VAC, them follows diode bridge rectifier, smoothing using large caps and regulation with standard 7805 voltage regulator. Such a solution proved itself in many designs. It is simple, cheap and builds fast. Tim put everything in short and informative post without overhead information. Following it, you will be able to construct a 5V DC power supply in an hour.
Designing a good PCB requires some knowledge and good calculator. First one can be obtained gradually by making tons of PCBs and learning from failures. Different thing is calculator. You cannot have all things in mind when tracing crucial traces in your PCB. What is high voltage is present? Or if there are large currents floating. How one or another configuration will behave when high frequency signals are used. There are always a tradeoffs between materials used and price. So measuring things right may save time and cost. Saturn PCB Design Inc. knows these problems and put their experience in a nice free calculator which covers many designing routine calculations. Here you are be able to calculate things like via/trace resistance, capacitance, inductance. By changing inductor width and thickness find its power dissipation. Also you can do quick thermal calculations that will allow to decide if you need a heat-sink. Other things include planar inductor parameter evaluation, spacing between traces on different voltages, crosstalks and more. Units can be selected between imperial and metric. Calculator is refined with many releases and can be downloaded here.
Take any professionally made PCB and you will find that in most cases areas between traces are filled with copper areas. In fact, background fills can give benefit but also be harmful to your all design. Dangerous prototypes have written a tutorial on how to make MCB background fills look professional and add additional features to the schematic. In most cases, background fills are connected to GND to reduce resistance and electric noise. Keep in mind that filing grounds where ever it fits can also have a negative effect – for instance ground planes near signal traces may add parasitic capacitance. In this case, probably better use hatched fills or avoid them at all. Sometimes it is useful to draw custom ground planes around power traces to make them more thicker in order to carry more current.
Writing formulas and equations for some publication or websites is time consuming task. Usually there is LaTex syntax used to enter formulas. But when formulas get more complex it gets really hard to remember all short-codes and it is easy to loose end in a long line. At school we are used to write equations by hand so why not to transfer that experience in to computer. Here is a nice small script that simply converts hand written equation in to LaTex and MathML XML codes. All you have is to open a MyScript demo website and start drawing. Algorithm analyzes hand drawn formulas and tries to convert them in to code. It previews your progress so you could redo last steps to match your needs. I should say it does job really great. So if you do lots of formulas you may give a try – could be faster than typing.
As an electronic enthusiast, you probably have a pile of resistors, capacitors and other electronic components. Most of them are color coded, and to use any of these you need to identify each of them. Usually, resistor color band table works fine or multimeter. But how to speed up the process a bit, free your hands and even eyes from looking at charts or multimeter. Anthony coded a simple application (EEspeak) which listens to you what type of element and colors are identified. Imagine sorting things out – sitting around with the pole of resistors and reading each color values aloud. Voice recognition seems to work great without any training. It can tell color coded resistor, capacitor and inductor value with its tolerance. Simple commands enable it to read values aloud and display on the screen. The program is free so give it a try – at least it’s fun.