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  • Building a Transistor Audio Preamplifier

    Introduction This blog post discusses a high quality three-transistor audio preamp, intended for speech applications such as radio or intercoms. The circuit was designed by michaelkellett and there is more detail at the blog page Two pre-amplifiers…

  • Simple DCR (Direct Conversion Receiver) – Part 2: Common Emitter Amplifier

    Table of Contents Introduction Circuit Diagram Dealing with Inputs and Outputs Power Supply Problem! Applying a Signal Frequency Response Loading the Amplifier Testing Both Stages Together Summary For all blog posts in this…

  • Simple DCR: Assembling a 7 MHz (40m) Direct Conversion Radio Receiver – Part 1

    Table of Contents Introduction How Does It Work? How to Build It? Circuit Diagram What Has Been Constructed So Far? Audio Amplifier Testing the Amplifier’s Third Stage Summary For all blog posts in this series, click here , or…

  • Building a VK5JST Antenna Analyzer for HF, VHF and UHF

    Table of Contents Introduction Obtain a Kit of Parts Building an Enclosure Flex PCB Construction Panel Meter End Panel RF Connector Assembly Main Board Parts Soldering Joining the End Panel and Main Board Attaching the End Panel/Main…

  • DIY Software Defined Radio Experimenter Board

    A low-cost, easy-to-build (no hand-wound components, all large [0805 or larger] surface-mount parts) radio for HF (~100 kHz to 30 MHz). Full detail, circuit diagram, printed circuit board files and parts list are here: https://www.element14.com/co...
    • https://youtube.com/watch?v=IEKubVkp4ww
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  • DJ3JJ > 432 MHz Amateurfunk Blog

    Ich habe angefangen Eagle zur Erstellung von Hochfrequenz Projekten zu benutzen. Aktuell arbeite ich an einem 100 W Verstärker für das 9cm Amateurfunk Band (3.4 GHz) Wer Interesse hat sich hier auszutauschen; bitte melden. Ich habe bereits eine RF Bibliothek…

  • USING REMOTERIG ON YOUR SMARTPHONE

    Microbit made an app where one can control the features of side radio brands, Kenwood, Elecraft, Yaesu and Icom. The app has been updated since the making of this video, but nonetheless the connection to your rig stays the same.
    • https://youtube.com/watch?v=TSfvgx8iP8E
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  • How to Configure your RemoteRig, Part I

    If you ever had trouble connecting remotely to your HF rig this may be the answer you are looking for here!
    • https://youtube.com/watch?v=tCLZykRUd8c
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  • Project14 | RF (Radio Frequency): Win a Spectrum Analyzer for the Most Innovative RF Project!

    RF (Radio Frequency) Enter Your Project for a chance to win a Spectrum Analyzer for the Most Innovative RF Project! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll In the Comments Below: Let Us Know Your Innovative Project…

  • ISO15693 Protocol HF RFID Reader Module JMY501G

    You may develop the Handheld or desktop RFID Reader. JMY501G will offer your the best choice. Please follow the specification first, PCD model: NXP SL RC400 Working frequency: 13.56MHz Card supported: TI TagIt, NXP I.Code SLI, ST LRI and other ISO15693…

  • Project14 | Build Projects that Use Radio Waves to Communicate Through NFC or RFID!

    NFC RFID Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll In the comments below: Propose a Project that Uses…

  • PlanetCatcher: Building a World-Band Radio Receiver

    Contents Contents Introduction Receiver Technology Design Overview PCB Layout AM RF Path FM RF Path TEF6606 Schematic Volume Control Off-Board Interface and Digital I/O Power Supplies Building the Wound Components Inductors…