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circuit

288 links - and 1 categories

Antennas : Multiband
  • Short Antenna for 40-30-20 Meters Band - This page describes an entirely simple, One-Knob matchbox that will match this antenna efficiently on 40, 30 and 20m, using a simple circuit that can be switched between series-resonant and parallel-resonant with just one banana jumper
    [ Hits: 235 | Votes: 1 | Rating: 7 ]
Antennas : Tuners
  • Homebrew Z-Match Transmatch - For this project, I decided to try my hand at building a Z-Match tuner from scratch. This type of tuner has been around for a while. While the Z-match can take on several variations, what distinguishes it from other circuits is that it is a resonant circuit that uses a fixed inductor.
    [ Hits: 132 | Votes: 0 | Rating: 0 ]
Antennas : W3DZZ
  • W3DZZ Multiband Antenna - An easy to build and extremely high performance antenna, works perfectly on all HF bands 3.5-28 MHz with some compromises, it is basically an half wave dipole for 40-80 meters, an LC circuit or trap 40 meters allows you to use a single radiating element.
    [ Hits: 463 | Votes: 3 | Rating: 7.67 ]
Ham Radio : Blogs : Asia : India
  • It's Ham Radio - Amateur Radio - News, Tutorials, Club Activities, DIY Instructions, and Latest Circuits Ideas from India.
    [ Hits: 79 | Votes: 6 | Rating: 8.67 ]
Radio Equipment : HF Transceivers : Yaesu FT-817
  • FT-817 Batteries for Air Travel - Three cell Lipo batteries for the FT-817 work really well, although not really sure about taking them on aircraft. The Lipos intended for use on RC Electric airplanes generally have a very low internal resistance and no internal protection against short circuit.
    [ Hits: 140 | Votes: 0 | Rating: 0 ]
  • FT-817 Audio Speech Compressor: Boosting Signal Power with SSM2165 - Designed for the FT-817, this audio speech compressor, centered on the Analog Devices SSM2165, offers a 40 dB compression range, enhancing signal power. Built externally with the SMD version to preserve warranty, the circuit interfaces smoothly with electret microphones. Testing shows a 6 dB average power increase. Adaptable to rigs with electret microphones, it maintains unity gain and 40 dB compression.
    [ Hits: 59 | Votes: 0 | Rating: 0 ]
Software : Circuit Design
  • Thevenin equivalent calculator - The Thevenin equivalent simplifies a complex circuit into an equivalent circuit with a voltage source and resistor for easy analysis of voltage and current at any point in the circuit. Use this online Thevenin calculator
    [ Hits: 53 | Votes: 0 | Rating: 0 ]
  • RF Inductor Calculator - This air-core solenoid style RF inductor calculator calculates the inductance, wire size, number of turns, and other parameters for an air-core solenoid inductor used in radio frequency (RF) circuits, based on user input of frequency, desired inductance value, and physical dimensions.
    [ Hits: 98 | Votes: 3 | Rating: 7 ]
Software : RF Design
  • AppCAD - Free windows application for RF Microwave and Wireless applications. AppCAD is useful for the design and analysis of many circuits, signals, and systems using products from discrete transistors and diodes to Silicon and GaAs integrated circuits. AppCad is a unique suite of RF design tools and computerized Application Notes to make your wireless design job faster and easier
    [ Hits: 128 | Votes: 1 | Rating: 8 ]
Technical Reference : Arduino
  • WIFI Remote FUCHS ATU for EndFed Antenna - The Fuchs Antenna tuner with a resonant circuit as a coupler. The Fuch Antenna Tuner is providing a high-efficiency compare to a 49:1 transformer using ferrite . The Fuchs tuner is a resonating L/C circuit to step-up the impedance from 50 Ohm to the required 3k. The ATU is able to perform automatic tuning with the addition of a tiny Aduino Nano and a SWR bridge.
    [ Hits: 114 | Votes: 0 | Rating: 0 ]
Technical Reference : Batteries : Battery Charger
  • How to Make an Automatic 12V Battery Charger - A home made battery charger 110-220 v AC providing from 1.25-24 v DC Adjustable at 8 Amps output power, with Short Circuit Protection Over Load and over charge Protection.
    [ Hits: 151 | Votes: 0 | Rating: 0 ]
Technical Reference : Components : Toroids
  • RF Toroid Calculator - This RF Toroid Calculator provides graphical calculator used to determine the inductance and other parameters of ferrite and powdered-iron toroids. It simplifies the process of selecting the appropriate toroid for use in radio frequency (RF) circuits
    [ Hits: 102 | Votes: 2 | Rating: 10 ]
Technical Reference : Homebrew
  • The 6CL6-807 Transmitter - This page is a detailed description of a 6CL6 and 807 valve transmitter. The page includes the complete circuit diagram to build this transmitter and several pictures
    [ Hits: 253 | Votes: 1 | Rating: 10 ]
Technical Reference : Keyers
  • The iKeyPad for ICOM Radios - The Icom series of radios from the IC-746 Pro on to the latest 7800 radios have a 4 memory digital voice and CW keyer built into the radio. This external Keypad, based on the official Icom circuitry can considerably help you on using the voice and cw keyer
    [ Hits: 58 | Votes: 1 | Rating: 8 ]
Technical Reference : Morse Code Oscillator
  • A Morse Code Practice Oscillator - Maybe not state-of-the-art technology but the author offers a quick and easy project for a Morse code practice oscillator using a 555 timer chip
    [ Hits: 138 | Votes: 0 | Rating: 0 ]
Technical Reference : Preamplifiers
  • A JFET preamplifer for 50 MHz - The circuit is simple, designed with a low component count and an inherent simplicity in order to keep the cost of building the preamplifier low, and to assure low noise operation.
    [ Hits: 96 | Votes: 0 | Rating: 0 ]
Technical Reference : Radio Frequency Interference
  • Understanding computer-generated RFI - Radio Frequency Interference (RFI) has always been a source of concern for the Radio Amateur. Until the recent introduction of complex circuitry in the home, our communications gear has been the main source of potential RFI. In this computerized age of ours, increasingly complex and sensitive receivers are being barraged by these and other sources of RFI.
    [ Hits: 84 | Votes: 0 | Rating: 0 ]
Technical Reference : Sound Card Radio Interfacing
  • Miniature CI-V for Icom Radios - With some fantasy the circuit can be easily assembled on a small scrap of pre-perf board,and then fitted in the DB9 serial connector shell. The interface requires two NPN transistors and few more passive components.
    [ Hits: 112 | Votes: 0 | Rating: 0 ]
  • FT-817 CAT and Dig Mode Interface - This interface includes both the CAT and the PTT circuits,and it can be controlled from a single COM port for the Yaesu FT-817 transceiver
    [ Hits: 112 | Votes: 0 | Rating: 0 ]
Technical Reference : Transverters
  • 2m to 70cm Transverter Circuit - A 70cm / 432 MHz Transverter Project transverter circuit is an electronic device that converts a radio signal from the 2 meter to the 70 centimeter band and vice versa, allowing a single transmitter/receiver to be used for both bands. It consists of an IF stage, local oscillator, frequency multiplier, and amplifier. The circuit must be designed for minimal signal loss, noise and intermodulation distortion.
    [ Hits: 77 | Votes: 0 | Rating: 0 ]

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