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Related:  General Electronics II

A Homemade Variable Tuning Capacitor for tuning in your FM stations... Would you like to make this site your homepage? It's fast and easy... Yes, Please make this my home page! Don't show this to me again. A 'Multi-Turn' Homemade Variable Tuning Capacitor... A remarkably simple homebrew device for tuning in your FM stations! From a range of 5pF to 27pF, this multi-turn capacitor can be made using only 6 items... My main interest has always been in FM Transmitters and FM Receivers...and always looking for unique ways of achieving the same end results, by making homemade devices in place of store-bought components. The Radio Shack Special project calls for a typical 6-lead variable tuning capacitor. The above picture is the homemade variable capacitor. This homemade device can be used for the Radio Shack Special Project or the TDA7000 FM Receiver Project or any RF device that would need a variable capacitor. Items needed for the project The machine screw and nuts can be purchased at your local Lowe's Store. Radio Shack sells magnet wire. ...your friend, Patrick

The Electronic Components and Semiconductor Superstore Get loopy with the DIY $10 Ableton Footcontroller (no soldering required) A free keyboard-mapping utility called Autohotkey (if you’re running Windows). If you’re running Mac, the program to use is calledIKey. That’s it. Here’s how to make it go: Above: Steps 1-2. Simple enough. 1. You’re going to remove a significant number of the QWERTY keyboard’s keys, leaving only those spaced far enough apart to operate with your foot. 8. Electronics DIY - Quality Electronic Kits, Electronic Projects, Electronic Schematics, FM Transmitters, TV Transmitters, Stereo Transmitters Adafruit MintyBoost USB Charger Kit v3.0

Hacking A Fluke Multimeter To Serve Readings Over WiFi Your multimeter is probably your most useful instrument if you work regularly with electronics. It goes with you everywhere, and is your first port of call in most cases when you are presented with a piece of equipment. And when you think about it, it’s a pretty amazing instrument. Multimeter technology has advanced to the point at which even an inexpensive modern device has functions that would have required a hefty budget a few decades ago. There is still one thing affordable multimeters remain unable to do: they can’t log their readings for analysis on a computer. They’re an instantaneous instrument, just as they always have been. Lord of Hackaday [Sprite_TM] decided to hack his multimeter to serve its readings over Wi-Fi. Opening up the 15B+, he was presented with its processor concealed under a blob of epoxy and thus unidentifiable. Further detective work allowed him to identify the baud rate, and supplying random commands delivered him some that returned data packets.

Power Quality Meter using Arduino -Use Arduino for Projects Arduino UNO project, Power Quality Meter, someone would call it’s PQ Monitor or PQ Analyzer. I had already published one blog devoted RMS voltage measurements on full band 20 – 20 000 Hz audio signals. ( Following my own style, I’d refer to already published materials whenever it’s possible ). This time measurements performed on single AC Power Grid frequency. ( 60 Hz in Canada. Algorithm would works with 50 Hz as well ). Features: Graphic LCD display 128×64;First 5 harmonics presentation;RMS Voltage Indicator;Frequency Monitoring;THD calculation;Internal data up to 63-d !!! The Holy Grail of this project, is a method of sampling input waveform. It’s completely eliminate necessity of the windowing.Only ONE period of input waveform is enough for precise calculation. In it’s essence, I created a software PLL (Phase Lock Loop). Hardware. As you can see on the drawings, circuitry is quite simple, one LCD ( I used SparkFun LCD-00710, could be different ) and one IC, LM311 – comparator.

The H.P. Friedrichs (AC7ZL) Homepage DIY Portable, Solar Powered Wi-Fi Repeater With a Wi-Fi hotspot, you can remain connected to the cloud from anywhere. Even then, a Wi-Fi router needs electricity to operate. To cut this umbilical cord, you can power it with the help of the sun or the wind just like this portable, solar powered Wi-Fi repeater. A solar panel powers a Linksys WRT54G v8 router with 7.5 volts at 500 milliamps in direct sunlight. For sunless times, you have a backup of 5 AA batteries that get charged up thanks to the solar panel. The solar-powered repeater is packed neatly into a cigar box for easy portability. What’s even neater is that the self built Wi-Fi repeater has a custom firmware called DD-WRT that scans and connects to the strongest signal automatically and then repeats it. Popular Wi-Fi Projects:

Low Cost Water Flow Sensor and Ambient Display using arduino -Use Arduino for Projects Water is a precious resource. Millions of people do not have access to clean drinking water, and as many as 4000 children die from water contaminated illnesses every day. Yet, we continue to be wasteful with our resources. The overarching goal of this project is to motivate more sustainable water use behavior and raise awareness about global water issues. This is an instructible on how to crudely detect water flow in a pipe and drive an ambient display. This is a project by Stacey Kuznetsov and Eric Paulos at the Living Environments Lab, at Carnegie Mellon University Human Computer Interaction Institute. Produced by Stacey Kuznetsov stace@cs.cmu. Eric Paulos eric@paulos. Living Environments The video below illustrates a previous version of this project, where a microphone is used instead of a piezo element to detect water flow. Step 1: Gather Materials You will need: Step 2: Build the Circuit

Manual Pick & Place Station Assembling a single electronic board using SMD parts is doable using simple tools with tweezers and a fine tip soldering iron. However, it can become tedious after a few boards or simply if you start an actual production yourself. Also, some parts are really hard to solder by classic means, and I ended up building a reflow oven to “bake” my boards. If you’re not familiar with reflow soldering, I suggest you have a look to this wikipedia article for details. Reflow Soldering For large boards, placing the SMD parts on the solder paste can really be an issue since your hands must travel above the board to reach the part location, with risks to drop the part and mess all your solder paste stencil work. The SMD pick and place station is meant to help the operator traveling above the PCB, pick parts using vacuum, and place them with a straight, smooth and accurate vertical movement to the exact spot where it’s suppose to land.

How to Build a Cheap Wi-Fi Controlled Water Valve One day a co-worker of mine asked me if I knew of a way to control an irrigation system from a smartphone or computer. We did some research and quickly found that it was very expensive to purchase a system with this capability, so we wondered if we could build it. This happened to be right around the time the ESP8266 first came out, and some quick searching revealed DC water valves that could be used to control water flow to the irrigation system. When the ESP8266 Wi-Fi module first hit the street, it was very cheap, but the initial attempts to use it included all AT-commands from another microcontroller, so it was a bit clunky. I’d used it like that a couple of times, but never really felt that I could make something reliable enough to use for a project. At this point, we had obtained a DC water valve and done some testing with the ESP8266, then we shelved the project for some months. Step 1 NOTE: The three diodes shown in the schematic are very important and must be installed! Step 2

Wireless Cellphone Charger Circuit - Electronic Circuit Projects In this post we will try to wireless cellphone charger circuit for facilitating a cordless cellphone charging without employing a conventional charger. Here the cellphone is required to be installed with a receiver circuit module internally and connected to the charging socket pins, for implementing the wireless charging process. Once this is done, the cellphone simply needs to be kept over the wireless charger unit for initiating the proposed wireless charging. In one of our earlier posts we learned a similar concept which explained the charging of a Li-ion battery through a wireless mode, here too we employ a similar technique but try to implement the same without removing the battery from the cellphone. Also, in our previous post we comprehensively learned the basics of wireless charging, we'll take the help of the instructions presented there and try to design the proposed wireless cellphone charger circuit.

Laser Activated GSM Call Alert Security Circuit for Home - Electronic Circuit Projects In this post we discuss a simple laser GSM call alert security circuit which immediately calls the master as soon as an intruder is detected through a laser beam interruption. The idea was requested by Mr. Roldan. The Request Good day to you sir swagatam, I am roldan from Philippines 35 years of age. The Design In one of my earlier posts I have already presented a Cell Phone Call Alert Security System Circuit designed to alert the user whenever an intrusion was detected, it employs the IC 4060 for the procedures. The present design also is based on a similar principle, however it utilizes an IC 555 and a small delay timer for implementing the functions making the circuit much simpler than the earlier concepts. The following diagram shows the detailed configuration, let's try to understand it further through the given explanations: Referring to the above shown laser activated GSM call security circuit, we can see that the IC 555 is configured as a standard astable.