Matt circuit

The article describes a very simple homemade emergency light circuit that can be used during power failures and outdoors where any other source of power might be unavailable. The circuit uses LEDs instead of incandescent lamp, thus making the unit very power efficient and brighter with its light output. Moreover, the circuit employs a very innovative concept especially devised by me which further enhances the economical feature of the unit. We know that LEDs require a certain fixed forward voltage drop to become illuminated and it is at this rating when the LED is at it’s best, that is voltages which is around its forward voltage drop facilitates the device to operate in the most efficient way. As this voltage is increased, the LED starts drawing more current, rather dissipating extra current by getting heated up itself and also through the resistor which also gets heated up in the process of limiting the extra current. If we could maintain a voltage around an LED near to its rated for...

The project was termed as Mighty Minty Boost as it was developed to function as iPod/iPhone charger with solar power. Aside from being small, it has a large battery capacity of 3.7V at 2000mAh and it accepts input power from 3.7V to 7V. As shown in the images below, it can become a compact USB power supply when the solar cell is removed after charging. The Velcro is used to secure the Mighty Minty Boost inside a backpack or messenger bag after unplugging the solar cell. For faster charging, a larger solar cell can be attached to the bag. Enough power can be generated to fully charge an iPhone in about 5.5 hours and an iPod Touch in 4 hours using a slightly larger solar cell with 6V at 250mAh. The charger will automatically switch to trickle charging when the cell reaches full charge. The charging current is limited to 100mA when charging using the mini USB port and the charging is limited to 280mA when charging using the barrel plug jack . The materials needed to build the charger incl...

Setting up an electric guitar is not rocket science, but it is something that a lot of guitarists shy away from. True, if you do this wrong, you can make your guitar play badly, but if you learn to do it right, you could save yourself a lot of cash. I should probably preface this by saying that today we are only going to do a basic setup. This is enough most of the time, but occasionally more is required, such as filing the nut, or doing some fretwork. If you want to set up a tremolo too, go to this post first: Setting Up or Adjusting a Stratocaster Tremolo Also, if you're setting up a Les-Paul-style guitar, you might prefer to have a look at this blog post: http://diystrat.blogspot.com/2012/09/how-to-set-up-gibson-les-paul-style.html So what does a basic setup involve? Let me break it down for you, as follows: 1. Checking and adjusting neck bow (how straight the neck is) 2. Checking and adjusting saddle height 3. Checking and adjusting the intonation (how far back or forward the s...

This is a very easy build a solar Solar Energy Powered an iPhone Battery Charger setup by setup. The professionalject was once termed as Mighty Minty Boost as it used to be developed to function as iPod/iPhone costr with sun power. Aside from being small, it has a big battery capacity of three.7V at 2000mAh and it settle fors input energy from three.7V to 7V. As exhibitn within the images below, it will probably turn out to be a compact USB energy provide when the sun cell is eliminated after charging. The Velcro is used to stable the Mighty Minty Boost inside of a backpack or messenger bag after unplugging the solar cell. For quicker charging, a larger solar cell will additionally be connected to the bag. Enough power may also be generated to absolutely cost an iPhone in about 5.5 hours and an iPod Touch in four hours using a reasonably higher sun cell with 6V at 250mAh. The charger will robotically swap to trickle charging when the cell reaches full charge. The charging present ...

This article describes a way to create an AVR perform multiple tasks. Beginners who want to urge an in-depth information in AVR assemble language programming will seek this project. The assembly language helps to utilize all the functions and capabilities of the processor. browse on to grasp a lot of. The most vital and major functionality of an operating system is performing multiple tasks on the CPU. what's being done here is time sharing multitasking which too on an AVR. An Atmega32 is ready up to perform Round-Robin Multitasking. Quasi-parallel execution of multiple tasks is feasible through Round-Robin Multitasking. The tasks are time-sliced and don't seem to be tired parallel. The project demonstrates how the switching mechanism is finished between seven individual tasks. The RAM is split between the amount of processes that are running. A timer is employed here and a trigger is executed when it reaches a compare worth. the required registers are pushed onto the stack. No...

IR Beam Breaker Circuit Diagram . This is an Infrared beam breaking alarm ideal to use in entry or passages.It is based on the working of the popular IR sensor Module TSOP 1738 which senses 38 kHz Infrared pulses from the IR LED of the transmitter. Range of the circuit is about 5 meters if the transmitter and receiver are properly aligned TSOP 1738 IR sensor module responds to only 38kHz pulsed infrared rays. It will not sense continuous IR ray from the IR LED.So a transmitter circuit(as one in TV remote handset) based on 555 IC is required. Any standard transmitter circuit based on 555 IC can be used. But its output should be 38kHz exactly. TSOP 1738 gives 5 volt output and 5mA current in the off position.  That is when IR rays are not available.Its output is current sinking so that when it receives 38kHz IR rays, output becomes zero.Pin 2 of the module should get a supply voltage between 4.5 to 6 volts.Higher voltage above 6 volts will destroy the device. The module is generally ...

Here’s one for the books. This pedal had been exhibiting strange behaviour where it would work fine for ages, then suddenly the volume would drop to about 50% or so. It would stay this way for a while and then jump back up to 100%. Repeat ad infinitum. I wouldn’t really have jumped to a “dodgy jack” diagnosis, but decided to spray a little contact cleaner in there anyway, since it was cheap and easy to do so. It didn’t fix the problem. The next thing I decided to try was to spray some contact cleaner in the pots (after that, it was going to be a case of checking the electronic components), but they could only be accessed by opening the box. So I removed the back cover: Moved the insulating sheet to the side: Lifted the board, and immediately saw the problem. You see it? Let me show you a close-up: Yeah, you see it now, right? The jack on the right? The one that's supposed to be in one piece? Well here’s what it looked like: I think we can quite safely call that a “dodgy jack”. I ca...

Most engineers will recognise the problem: Your circuit needs a stable 1 or 2 MHz clock generator (in the author’s case it was for a Pong game using an old AY3-8500). A suitable crystal is not to hand so you cobble together an RC oscillator (there are plenty of circuits for such a design). Now it turns out that you don’t have exactly the right capacitor so a preset pot is add e d to allow some adjustment . Before you know it the clock circuit is taking up more space on the board than you had hoped.  Providing the application does not demand a precise clock source a tiny 8-pin microcontroller may offer a better solution to the problem. It needs no additional external components and an old ATtiny15 can be found quite cheaply. Another advantage of the solution is that clock frequency adjustment does not involve changing external components and is not subject to component tolerances.  The microcontroller’s internal RC oscillator is already accurately calibrated to 1.6 MHz. With it...