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Microphone compressor using LM1458 vu3dxr.in/microphone-c...
Microphone compressor using LM1458 dual op-amp
The LM1458 is a dual op-amp used in audio amplification circuits. Here how you can create a simple microphone compressor using the LM1458.
vu3dxr.in
January 22, 2026 at 1:45 PM
Microphone compressor using LM1458 vu3dxr.in/microphone-c...
Mighty Mite 5W Crystal Controlled QRP CW Transmitter vu3dxr.in/mighty-mite-...
Mighty Mite 5W Crystal Controlled QRP CW Transmitter
Build classic Mighty Mite 40-meter QRP CW transmitter. Full circuit overview, operation, and design explanation. Ideal DIY ham radio project for enthusiasts.
vu3dxr.in
January 22, 2026 at 1:07 PM
Mighty Mite 5W Crystal Controlled QRP CW Transmitter vu3dxr.in/mighty-mite-...
Build Your Own Multiband G5RV Antenna: A Classic Ham Radio Project vu3dxr.in/build-your-o...
Build Your Own Multiband G5RV Antenna for 80-10M Bands
Learn how to build a classic multiband G5RV antenna. This guide provides a detailed diagram and insights into constructing this versatile HF antenna.
vu3dxr.in
January 21, 2026 at 6:08 AM
Build Your Own Multiband G5RV Antenna: A Classic Ham Radio Project vu3dxr.in/build-your-o...
Terminated Mini Loop Antenna : Small Space Ham Radio Antenna vu3dxr.in/terminated-m...
Terminated Mini Loop antenna : Small Space Ham Radio Antenna
The Terminated mini loop antenna is a relatively simple antenna to construct. It can provide the user with wide/multi band access
vu3dxr.in
January 20, 2026 at 4:19 PM
Terminated Mini Loop Antenna : Small Space Ham Radio Antenna vu3dxr.in/terminated-m...
Getting Started with FreeDV: A Beginner’s Guide to Digital Voice on Amateur Radio vu3dxr.in/getting-star...
Getting Started with FreeDV: A Beginner’s Guide to Digital Voice on Amateur Radio
Learn FreeDV digital voice for amateur radio. Beginner's guide covers setup, equipment, modes, and making your first contact using open-source software.
vu3dxr.in
January 20, 2026 at 9:00 AM
Getting Started with FreeDV: A Beginner’s Guide to Digital Voice on Amateur Radio vu3dxr.in/getting-star...
Building Sovina 40M Class E CW Transmitter with BS170 MOSFETs vu3dxr.in/building-sov...
Building Sovina 40M Class E CW Transmitter with BS170 MOSFETs
High-efficiency 40M CW Class-E CW transmitter using BS170 MOSFETs and 74HC02. Complete circuit explanation and build notes for QRP hams.
vu3dxr.in
January 19, 2026 at 3:48 PM
Building Sovina 40M Class E CW Transmitter with BS170 MOSFETs vu3dxr.in/building-sov...
Build a Powerful FM Radio Bug Transmitter vu3dxr.in/build-a-powe...
Build a Powerful FM Radio Bug Transmitter
guide on building a high-performance FM radio bug transmitter using BC547 and 2N3563 transistors. Explore RF electronics with this powerful 100MHz DIY project
vu3dxr.in
January 19, 2026 at 11:39 AM
Build a Powerful FM Radio Bug Transmitter vu3dxr.in/build-a-powe...
Tree Mounted Quarter-Wave Vertical Antenna vu3dxr.in/tree-mounted...
Tree Mounted Quarter-Wave Vertical Antenna
Technical explanation of a tree-mounted quarter-wave vertical antenna using only two sloping radials. Covers working principle, feed impedance and construction,
vu3dxr.in
January 19, 2026 at 5:30 AM
Tree Mounted Quarter-Wave Vertical Antenna vu3dxr.in/tree-mounted...
Building the FBK Sleeve Antenna for VHF/UHF Amateur radio vu3dxr.in/building-the...
Building the FBK Sleeve Antenna for VHF/UHF Amateur radio
Build a compact dual-band FBK sleeve antenna for VHF/UHF bands from coax cable. Simple, efficient, and ideal for portable ham radio use.
vu3dxr.in
January 10, 2026 at 3:13 PM
Building the FBK Sleeve Antenna for VHF/UHF Amateur radio vu3dxr.in/building-the...
Hotel Antenna for 2 Meter and 70 Centimeter Amateur Bands vu3dxr.in?p=3648
Hotel Antenna for 2 Meter and 70 Centimeter Amateur Bands
Compact Hotel Antenna design for 2 meter and 70 cm amateur radio bands. Includes dimensions, working principle, installation tips, and performance details
vu3dxr.in
January 10, 2026 at 4:42 AM
Hotel Antenna for 2 Meter and 70 Centimeter Amateur Bands vu3dxr.in?p=3648
Building a Double Bazooka Antenna for HF and VHF Ham Bands vu3dxr.in/building-a-d...
Building a Double Bazooka Antenna for HF and VHF Ham Bands
Learn how the double bazooka antenna works, why it offers low noise performance, and how to calculate accurate lengths for HF, VHF, and UHF amateur radio bands.
vu3dxr.in
January 9, 2026 at 4:04 PM
Building a Double Bazooka Antenna for HF and VHF Ham Bands vu3dxr.in/building-a-d...
Hourglass Loop Antenna : A Stealthy Performer for VHF and UHF vu3dxr.in/hourglass-lo...
Hourglass Loop Antenna : A Stealthy Performer for VHF and UHF
Build the KE4ERO Hourglass Loop antenna for VHF and UHF. Includes a detailed dimension table for 144 and 432 MHz, material lists, and ham-friendly tuning tips.
vu3dxr.in
January 9, 2026 at 9:18 AM
Hourglass Loop Antenna : A Stealthy Performer for VHF and UHF vu3dxr.in/hourglass-lo...
AM Radio into an SSB Receiver with a Simple BFO Circuit vu3dxr.in/am-radio-int...
AM Radio into an SSB Receiver with a Simple BFO Circuit
Learn how to use a 455 kHz ceramic resonator oscillator as a BFO for SSB reception in AM radios using proximity coupling - no modifications needed.
vu3dxr.in
January 8, 2026 at 4:29 PM
AM Radio into an SSB Receiver with a Simple BFO Circuit vu3dxr.in/am-radio-int...
Build Your Own Commando AM Transmitter vu3dxr.in/build-your-o...
Build Your Own Commando AM Transmitter
Build your own Commando AM Transmitter circuit with 3 transistors. Complete guide covers Q1 oscillator, Q2 buffer & Q3 amplifier stages.
vu3dxr.in
January 8, 2026 at 4:19 PM
Build Your Own Commando AM Transmitter vu3dxr.in/build-your-o...
The Poor-Man’s Transmitter: Building a Simple AM Radio Beacon from Vintage Electronics vu3dxr.in/the-poor-man...
Poor-Man's Transmitter: Simple AM Radio Beacon from Vintage
The Poor-Man's Transmitter: Building a Simple AM Radio Beacon from Vintage Electronics, uses a clever arrangement of 4011 CMOS gates to create AM Radio Beacon
vu3dxr.in
January 8, 2026 at 4:03 PM
The Poor-Man’s Transmitter: Building a Simple AM Radio Beacon from Vintage Electronics vu3dxr.in/the-poor-man...
80 meter 1W QRP Transmitter with Ceramic Resonator Control vu3dxr.in/80-meter-1w-...
80 meter 1W QRP Transmitter with Ceramic Resonator Control
80 meter 1W QRP Transmitter with Ceramic Resonator Control delivers 1 watt of power across the 80-meter band (3.52 to 3.59 MHz) with frequency stability
vu3dxr.in
January 8, 2026 at 3:49 PM
80 meter 1W QRP Transmitter with Ceramic Resonator Control vu3dxr.in/80-meter-1w-...
Microphone Pre-Compressor Circuit for SSB Transceivers vu3dxr.in/microphone-p...
Microphone Pre-Compressor Circuit for SSB Transceivers
A practical microphone pre-compressor circuit for SSB transceivers using JFET and transistor stages. Improve transmit audio clarity and power in amateur radio
vu3dxr.in
January 8, 2026 at 10:22 AM
Microphone Pre-Compressor Circuit for SSB Transceivers vu3dxr.in/microphone-p...
Simple Speech Processor for Homebrew SSB Transceivers vu3dxr.in/simple-speec...
Simple Speech Processor for Homebrew SSB Transceivers
A simple speech processor circuit for homebrew and QRP SSB transceivers, improving average talk power while maintaining clear and natural audio quality
vu3dxr.in
January 7, 2026 at 3:52 PM
Simple Speech Processor for Homebrew SSB Transceivers vu3dxr.in/simple-speec...
Microphone Preamplifier with Diode Clipper for SSB Transceivers vu3dxr.in/microphone-p...
Microphone Preamplifier with Diode Clipper for SSB Radio
Learn how to build high-performance microphone preamplifier featuring a diode clipper. This guide breaks down transistor stage and 1N914 limiting mechanism
vu3dxr.in
January 7, 2026 at 2:16 PM
Microphone Preamplifier with Diode Clipper for SSB Transceivers vu3dxr.in/microphone-p...
Build Your Own 80M CW Transmitter from Scratch vu3dxr.in/build-your-o...
Build Your Own 80M CW Transmitter from Scratch
Learn to build a simple 80M CW transmitter with crystal oscillator and parallel power amplifier. Complete circuit guide for amateur radio enthusiasts
vu3dxr.in
January 7, 2026 at 6:15 AM
Build Your Own 80M CW Transmitter from Scratch vu3dxr.in/build-your-o...
J-Pole Antenna Using 300 Ω TV Ribbon Line vu3dxr.in/j-pole-anten...
J-Pole Antenna Using 300 Ω TV Ribbon Line
Simple 300 ohm twin-lead J-Pole antenna for 2-meter ham radio. Lightweight, no radials, easy to build, and ideal for portable, emergency, and home use.
vu3dxr.in
January 7, 2026 at 3:18 AM
J-Pole Antenna Using 300 Ω TV Ribbon Line vu3dxr.in/j-pole-anten...
Twin-Lead J-Pole Antenna for VHF and UHF Amateur Radio vu3dxr.in/twin-lead-j-...
Twin-Lead J-Pole Antenna for VHF and UHF Amateur Radio
Twin-lead J-Pole antenna explained with construction details, dimensions, feed method, and performance for VHF and UHF amateur radio applications.
vu3dxr.in
January 6, 2026 at 10:59 AM
Twin-Lead J-Pole Antenna for VHF and UHF Amateur Radio vu3dxr.in/twin-lead-j-...
Multiband Dipole Antenna for 10–80 Meters vu3dxr.in/multiband-di...
Multiband Dipole Antenna for 10–80 Meters
Multiband dipole antenna covering 10, 11, 15, 20, 40, and 80 meters using loading coils and a matching section. Compact HF antenna requiring external tuner.
vu3dxr.in
January 6, 2026 at 7:24 AM
Multiband Dipole Antenna for 10–80 Meters vu3dxr.in/multiband-di...
3 x 5/8 Collinear antenna for 435 MHz UHF Band vu3dxr.in/3-x-5-8-coll...
3 x 5/8 Collinear antenna for 435 MHz UHF Band
High gain 435 MHz UHF collinear antenna design using three 5/8-wave radiators and inductive phasing. Ideal for UHF repeaters with 6 dB gain
vu3dxr.in
January 6, 2026 at 7:11 AM
3 x 5/8 Collinear antenna for 435 MHz UHF Band vu3dxr.in/3-x-5-8-coll...
VHF Collinear J-Pole : The DIY Super J-Pole Antenna vu3dxr.in/vhf-collinea...
VHF Collinear J-Pole : The DIY Super J-Pole Antenna
Take your VHF/UHF station to the next level with DIY Super J-Pole guide. Learn how to build this collinear antenna for maximum gain and clear long communication
vu3dxr.in
January 6, 2026 at 6:23 AM
VHF Collinear J-Pole : The DIY Super J-Pole Antenna vu3dxr.in/vhf-collinea...