64 KEY INFRARED REMOTE CONTROLLER USING PT2222M – NEC CODE

64 channels Infra-Red Remote Transmitter circuit build around PT2222M IC, The IC is pin to pin compatible with NEC uPD6122 respectively, the remote is capable of controlling 64 functions keys and 3 double keys. The PT2222M Infra-red remote control transmission ICs using the NEC transmission format that is ideally suited for TVs, DVD Players, Audio Equipment, Air Condition, etc. By combining external diode a ...

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Arduino Robot

first of all, i am sorry if i have grammar mistakes, i am asian and i am 13 years old, i study arduino by my self (mostly my self) and this is my first project and also my first instructables. this is the robot that i used to compete with my friends in soccer robot. i did some modifications when i used it but it is broken now, so what i show you here is just a smartphone control robot. i will upload the imp ...

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RIDING THE NOSTALGIA TRAIN WITH A 6502 FROM THE GROUND UP

In the very early days of the PC revolution the only way to have a computer was to build one, sometimes from a kit but often from scratch. For the young, impoverished hobbyist, leafing through the pages of Popular Electronics was difficult, knowing that the revolution was passing you by. And just like that, the days of homebrewing drew to a close, forced into irrelevance by commodity beige boxes. ...

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AppNote: Inverting DC/DC controller converts a positive input to a negative output with a single inductor

There are several ways to produce a negative voltage from a positive voltage source, including using a transformer or two inductors and/or multiple switches. However, none are as easy as using the LTC3863, which is elegant in its simplicity, has superior efficiency at light loads and reduces parts count compared to alternative solutions. Advanced Controller Capabilities The LTC3863 can produce a –0.4V to –1 ...

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Power and Dependent Sources

Determine the power absorbed by the VCVS in the figure. Solution: The VCVS consists of an open circuit and a controlled-voltage source. There is no current in the open circuit, so no power is absorbed by the open circuit. The voltage vc across the open circuit is the controlling signal of the VCVS. The voltage Vc (across 2 ohm resisitor) measures vc to be vc = 2V. The voltage of the controlled voltage sourc ...

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A combined MSF/DCF atomic clock receiver

For this to work you must obviously live in an area that can receive both signals. My circuit is based on two modules taken from two radio clocks bought at Lidl’s supermarket. Originally both were for the DCF clock but by substituting the original 77.5kHz crystal with a 60kHz crystal, one of the modules was converted to MSF. Notice that both antennas are lined up in my photograph. This is because Anthorn an ...

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OurPCB – ‘What Are the Circuit Boards Made Of’

PCB boards are all around us in every gadget we use. Be it the smartphone or a simple calculator; their function depends on the performance of PCBs. Do you know what the PCB circuit boards made of are? PCB vs PCBA-What is the differences? What does a circuit board consist? We have prepared this helpful guide where you can learn about the materials used to make PCBs. You can also get a picture of how a manuf ...

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PCB Development – You May Not Know About The Future Trends!

We have finally reached the era of IOT (Internet of Things) and it’s all over the place on practically every nook and cranny of the world. According to professionals, IoT can be illustrated as two things- the fourth industrial upheaval and the greatest thing that has happened since the eruption of .com. With the latest update gathered by Gartner, in the year 2020, the earth is likely to possess not less tha ...

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Fairchild Simplifies Dimmable LED Lighting Design

Single-Stage Primary-Side-Regulation PWM Controller for PFC and Phase Cut Dimmable LED Driving The FL7734 is a highly integrated PWM controller with advanced Primary-Side-Regulation (PSR) technique to minimize components for low power LED lighting solutions. Using the innovative TRUECURRENT technology for tight constant-current control, it enables designs with constant-current (CC) tolerance of less than ±1 ...

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Electronic Circuit Designing: Multitasking with Circuits (Part 4)

Step: 8) Find reusable modules from the circuit diagram Whenever we do hardware designing, the first rule is to make it in modules that can be reusable. The modules that we make for this particular project may come useful in another project and hence reduce the development time for that project. Even if a module is in use and at the same time found to be useful in another project, we can build another copy ...

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Soil sensor mini kit shows if plant needs watering

Adafruit Circuit Playground Express Soil Sensor Mini Kit is designed to measure the soil moisture content. This kit, available now from Mouser, is based on the Circuit Playground Express platform and delivers the measurement utilising a nail and alligator clip. As the moisture encompassing a nail in the plant pot rises, the board detects the change and outputs the result as through the design. The platform ...

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DEAD BUG ARDUINO IS LIVELY AND SHIELD-COMPATIBLE

Microcontroller demo boards such as the Arduino UNO are ubiquitous on Hackaday as the brains of many a project which inevitably does something impressive or unusual. Sometime someone builds a particularly tiny demo board, or an impressively large one. In the case of the board featured here, the Arduino is a gorgeous labor of love which can’t really be called a board since there is no PCB. Instead of the tra ...

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