YO3DAC Homebrew RF Circuit Design Ideas qsl.net Homebrew RF Circuit Design Ideas "There is no such thing as a new idea. It is impossible. We simply take a lot of old ideas and put them into a sort of mental kaleidoscope. Cell Phone Detector Circuit | Mobile Phone Tracking System ... Basic Principle of Mobile Phone Detector Circuit. The basic principle behind the Cell Phone Detector circuits is to detect the RF Signals. In the Schottky diode circuit, the Schottky Diode is used to detect the cell phone signal as they have a unique property of being able to rectify low frequency signals, with low noise rate. Sferics Detector techlib Since these photos, I've connected the Sferics Receiver in parallel with my SID receiver to an Active Antenna.The gain was far too high. I had to increase the 330 ohm going to pin 1 to 3.3k and change the gain pot from 200 ohms to 2k. Abstract for Experimental Methods in RF Design W7ZOI Abstract for Experimental Methods in RF Design by Wes Hayward, W7ZOI; Rick Campbell, KK7B; and Bob Larkin, W7PUA Published by ARRL, 2003 512 pages with approximately 1000 figures and a CD ROM The Amazing All Band Receiver techlib The Amazing All Band Receiver is basically a diode detector followed by a high gain audio amplifier. This is not a multi band receiver; it picks up everything at once! Superheterodyne receiver A superheterodyne receiver, often shortened to superhet, is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency.It was invented by US engineer Edwin Armstrong in 1918 during World War I. Virtually all modern radio receivers use the superheterodyne ... Electronic Schematics Circuit Zone The above FM transmitter design is a result of many hours of testing and tweaking. The goal was simple; to test many existing BA1404 transmitter designs, compare their performance, identify weaknesses and come up with a new BA1404 transmitter design that improves sound quality, has very good frequency stability, maximizes transmitter's range, and is fairly simple for everyone to build. RF & Microwave Teledyne Advanced Electronic Solutions 2 HK160726 RFMW Prototype to full scale production of complex, mixed technology and miniaturized assemblies RF & Microwave Applications Detector Log Video Amplifier(DLVA) 555 Super Regenerative IF HF Spectrum Analyser Alan Yates 2011 01 30. 555 Super Regenerative IF HF Spectrum Analyser. This is another of those crazy ideas that have been rolling around in my head for a while now. Circuit Zone Electronic Projects, Electronic ... That small circuit transmitter it is ideal for ready espionage for strip from radio Fm or receiver of VHF. Of course the recreational purpose also exists and the children will adore to have a transmitter that allows to speak for a radio FM placed at distant place and like this pretend the secret agent. Crystal detector The contact between two dissimilar materials at the surface of the detector's semiconducting crystal forms a crude semiconductor diode, which acts as a rectifier, conducting electric current in only one direction and resisting current flowing in the other direction. In a crystal radio, it was connected between the tuned circuit, which passed on the oscillating current induced in the antenna ... Vintage Popular Electronics Magazine Articles RF Cafe People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. In January 1972, Electronics World magazine was combined with Popular Electronics.For all of the articles posted a page is created with a cover image and the table of contents. SparkFun Sound Detector SEN 12642 SparkFun Electronics The SparkFun Sound Detector is a small and very easy to use audio sensing board with three different outputs. The Sound Detector not only provides an audio output, but also a binary indication of the presence of sound, and an analog representation of its amplitude. Electronic, Microcontroller and Software Engineering ... The one stop educational site for all Electronic and puter students. If you want to learn something new then we are here to help. We work on Microcontroller 1 KW SSPA for 1.8 54 MHz Amateur Radio Station W6PQL Home High power amplifier for 1296 1 KW SSPA for 1.8 54 MHz A 1.5 KW LPF for 160 6m 1.8 to 54 MHz Dual Directional Detector 1.8 to 54 MHz combiner set 1 200 Transistor Circuits Talking Electronics Kit for Transistor Circuits $15.00 A kit of components to make many of the circuits presented in this eBook is available for $15.00 plus $7.00 post. Or email Colin Mitchell: talking@tpg .au The kit contains the following components: A Dip Meter Using the Lambda Negative Resistance Circuit A Dip Meter Using the Lambda Negative Resistance Circuit by Lloyd Butler VK5BR (Originally published in Amateur Radio, January 1997) (Correction made in Sept. 2007 see note) A DC Fault Protection Circuit for Audio Amplifiers The standard Class AB audio power amplifier allows for direct coupling of the output of the amplifier to speakers. This is very good in that no capacitors or transformers get in the way of the sound quality coming out. IR Transmitter and Receiver Circuit for Best Remote ... IR Transmitter and Receiver Circuit for Best Remote Control System Gallery of Electronic Circuits and projects, providing lot of DIY circuit diagrams, Robotics & Microcontroller Projects, Electronic development tools Transistor 101science 2. TYPICAL TRANSISTOR CIRCUIT This is a silicon transistor circuit showing typical voltage values.When the forward base emitter voltage is 0.6 to 0.7 V, the transistor is silicon. Germanium transistors will have a forward base emitter bias voltage of 0.2 to 0.3 V This is a silicon transistor because 2.6 base volts minus 1.9 emitter volts equal a forward bias of 0.7 volts indicating a silicon ... High current 12V 13.8V at 30A,25A,20A,15A power supply This is 12V high current power supply circuit. A CAR Radio transmitters to use in the home, need a ham radio power supply DC 12V or high current 13.8V power supply with enough power out of 5A,10A,15A,20A,25A, and 30A as you need. How to build a Surf PI 1.2 pulse induction metal detector ... This post will show you how to build your own metal detector from the Surf Pi 1.2 pulse induction kit. Ive recently been getting into metal detectors as a hobby for the past few months…Despite being for “old retired men” and nerds, metal detecting is fun to do with a friend, the family, or by yourself. Voltage Regulator Circuits Electronics Tutorial and ... Voltage Regulator Circuits and Tutorials 5 Volt Power Supply Circuit, 12 Volt Alarm Power Supply, 12 Volt DC Power Supply, 12 Volt to 9 Volt DC Converter, 5 Volt Power Supply, 9 Volt Stabilized Power Supply, Adjustable power supply, Car Battery Charger, Car Converter for 12 Volt to 9V, Dual Regulated Power Supply, Dual 12V Power Supply, Fixed Voltage Power Supply, High Current Power Supply ... NFC RFID Reader Ultra Low Power Card Presence Detect With ... Application Report SLOA184– March 2013 NFC and RFID Reader Ultra Low PowerCard Presence Detection Using MSP430 and TRF79xxA Alexander Kozitsky, Josh Wyatt..... "Five by Twenty" TIM e Telecom in un unico portale | TIM BACKGROUND. Many projects of homebuilt ham transceivers obey to some intriguing rules, that often are quite challenging in miniaturization, or refusing to use any Integrated Circuit, or being powered by a lemon. Alan Yates' Laboratory Ion Chamber Alpha Particle Counter This circuit is sensitive to alpha particles only. This is a blessing in a lot of ways, it makes it an almost ideal device to measure Radon in air without a photomultiplier and ZnS:Ag scintillator powder required to build a Lucas cell.It is extremely easy to build, and surprisingly easy to get working, even with less than perfect electrostatic and RF shielding. Grebe Synchrophase RadioBlvd Radio Boulevard Western Historic Radio Museum. A. H. GREBE & COMPANY, INC. A GUIDE TO THE SYNCHROPHASE MU 1. Part 1 Brief History The Circuit Design The Evolution of the Synchrophase MU 1, MU 2. Part 2 Engineering Upgrades in Chronological Order The Serial Letter Dilemma MU 1 & MU 2 Serial Letter Log Simple Delay Timer Circuits Explained | Homemade Circuit ... Here we discuss how we can make simple delay timers using very ordinary components like transistors, capacitors and diodes. Importance of Delay Timers In many electronic circuit applications a delay of a few seconds or minutes becomes a crucial requirement for ensuring correct operation of the circuit. Without the specified delay the circuit could malfunction ... Audio circuits to build ePanorama.net Links Audio circuits to build. The following links to circuit diagrams and building projects I have found from other web sites. I have tested only very few of them so there is no guaratee that those circuit will work as expected. 12ghz Radiotelescope for $200 Radiosky For the past year I have been experimenting with the 18 inch DDS dish antennas. The dish and LNB , (combination of a low noise amplifier and block downconverter ed.), have no problem detecting the difference between cold sky, the Sun, warm bricks or a person’s body. Remote Controlled Fan Regulator Project using ATmega8 Construction of Remote Controlled Fan Regulator. You can make the circuit as per the schematic on any general purpose PCB. To ease your job we are giving the PCB Layouts too, so that you can make the PCB at your home using the Etching Method.You may also have the PCBs made from any fabrication house too. AM Radio Receiver Using the NE602 Balanced Mixer" Pictured above is a little AM superhetrodyne receiver that covers the broadcast band from 550 Khz to 1650 Khz. The circuit employs the 8 pin Signetics balanced mixer IC (NE602) which converts the incoming RF signal to the standard 455 Khz IF signal and provides about 13dB gain. The Spontaflex Reflex Web Page the ingenious circuits of Sir Douglas Hall as published in The Radio Constructor.Circuits and construction details for receivers using the automatic spontaflex reflex circuit

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active antenna circuit antenna circuits rf circuits

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