Audio Projects: Enhance your Audio Quality
Optimize Your Audio Setup
Audio projects are essential for optimizing and enhancing both received and transmitted audio quality in ham radio operations. This category includes various DIY electronics projects such as speech processors, amplifiers, and filters that improve intelligibility and clarity. Users can find detailed schematics and build kits that facilitate the construction of devices like low-pass audio filters and microphone preamplifiers. These projects not only enhance audio performance but also provide valuable learning experiences in electronics and audio engineering.
Key components for these projects may include transistors, capacitors, resistors, and integrated circuits. For instance, the RF Speech Processor project features a complete schematic, while the Audio Spectrum Analyzer provides tools for real-time analysis. Resources also cover modifications for existing equipment, such as the JRC NVA-88, ensuring users can tailor their setups to specific needs.
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A circuit which had been used in many other application before. The configuration described here is optimized for IPHONE/radio operation. -
A collection of audio amplifier projects by N1HFX -
Build an audio Processor and clipper optimised for SSB transmitter -
A very effective AF Adaptor, with built-in noise blanker and 30 Hz CW filter modules by PA0LQ -
An homebrew audio mixer for the ham shack by GW6ITJ -
Easy circuit that provide good gain to weak audio signals -
This circuit consists of microphone amplifier and a high pass filter. Suitable to improve signal readability. -
Analyzes audio from 10 Hz to 20 kHz, input from microphone or wave file, Variable sample rates (8000 Hz, 11025 Hz, 22050 Hz, 44100 Hz) Variable transform sizes (1k, 2k, 4k, 8k) Upper and lower limits adjustable Continuous, averaged, peak hold -
Audio Spectrum Analyzer for Real-time, FFT, OscilloScope, Frequency counter, voltmeter, noise and distortion meter, phase shift meter. Multi-Tone Sound Frequency Sweep Generator. White, pink noise. -
Bluetooth headsets are very common with cell phone users. As such, many amateurs may already own a Bluetooth (BT) headset. So why not use it with amateur radio? -
When one operates at low power on SSB, speech processing becomes almost essential to get through the QRM. The circuit is a low cost speech processor that will perform well with a minimum of construction effort. -
Have you searched and searched for a good speaker for your ham radio? That perfect speaker that would let you hear voices through the noise and static without hiss? -
Design guidelines for Op Amp audio preamplifier circuits by Mike Martell N1HFX -
An excellent guide on choosing external audio equalizers by K3DAV -
Throughput improvement for the FT726R - Tapr PSK modem -
Audio processing and ALC in the FT-897D -
How adjust DSP settings for your trasmitter when using Heil Sound microphones -
Setup for the Yaesu FT-2000 by John K3UR -
ICOM audio DSP settings and pin connections for heil sound headphones -
Kenwood radios audio DSP settings for Heil Sound headphones -
440 Hertz peaked low pass audio filter experiments -
A microphone preamplifier schematic for hand-helds by ON6MU -
Improving your own signal quality by GM3SEK -
RF Speech Processor project with complete schematic by Jagodic YU1OXB -
Soundcard audio tools and toys, experimental ideas and utilities. Signal Generator, Frequency-counter / instrument-tuner, Real-time Spectrum Analyser -
Articles published by the Radio Society of Great Britain, basic principles, construction of a simple equaliser circuit -
Design Guidelines for Bipolar Transistor Audio Preamplifier Circuits By Mike Martell N1HFX -
Yaesu DSP audio settings for Heil Sound headphones -
Using Hi-Fi Audio with FT-1000. Includes many FT-1000D modifications too by K6JRF -
A 12V powered, 4x15 Watt quad audio amplifier -
ON6MU 12 Watt amplifier schematic -
Here is a rather nice audio filter for use with Ham Radio gear. It features switchable operation as a -32 dB per octave low pass or notch filter having a 200Hz-2500Hz tunable cutoff frequency, buffered input and output, switch selectable filter bypass function, and good stability. T -
On this page, you will find one of my designs; An Audio Selection Panel (ASP). The Audio Selection Panel allows you to control 4 Transceivers and hear the audio through the built-in loudspeaker and on an external boomset (combination Microphone/ headset). On or more transceivers can be selected at a time to transmit and/ or receiv -
This article investigates SSB signal quality during the CQ WW 2015 SSB contest. It highlights the importance of adhering to the ideal SSB signal profile, the impacts of intermodulation distortion, and the consequences of poor-quality signals. The analysis underscores the need for well-tuned equipment to ensure cleaner, more efficient signals and, consequently, a more enjoyable and spacious experience for contest participants and amateur radio operators. -
Article with answers to common questions as what cable types to user, cable length, how to join ends. -
Many low-power SSB rigs and kits lack dedicated speech processor circuitry, although most modern HF rigs include it. Speech processing is crucial for low-power SSB to overcome QRM. This simple, low-cost circuit integrates a microphone element and can be housed in a defunct desk mike. It features a feedback amplifier, audio preamplifier, and adjustable speech compression control -
Automated voice announcements project built to have an automated way to deliver club announcements via the repeater network. -
A Bass Eq Pre amplifier for high impedance PU by ON6MU -
Design Guidelines for JFET Audio Preamplifier Circuits By Mike Martell N1HFX -
An interesting article on how build an optimal sounding communications loudspeaker capable to optimize sound reproduction at the frequency range from 150 Hz to 3 kHz. -
Build this noise reducing system to enhance audio of your speaker. A project by kg4jjh -
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. -
Make an otherwise fine radio even better, change one resistor and one capacitor in the audio section -
Improving the intelligibility of an SSB transmissions What is important when processing speech. Which bands have more impact on speach ? -
Circuit designs for IC audio amplifiers by N1HFX -
Adding 2 RCA inputs, 1 high impedance filtered audio output RCA 3, 3 HIGH PASS filters, 3 LOW PAS filters to the JRC NVA88 Speaker -
ON6MU Low Power amplifier -
Single-sideband (SSB) radio enhances spectral efficiency but poses challenges with audio intelligibility, particularly in noisy conditions. A microphone audio compressor addresses these issues by dynamically managing the audio signal’s dynamic range. It amplifies quiet sounds and attenuates loud ones, ensuring consistent audio levels for improved clarity. Benefits include increased intelligibility, higher average power, and reduced spurious emissions. While essential for optimal SSB performance, careful parameter adjustment is crucial to balance natural sound quality and effective communication across various operating modes. -
Mic online calculator , Microphone Dynamic Range Calculator, Microphone Sensitivity Calculator -
Audio setup at N2RIT built around the Yaesu FT-950 abd the Heil Sound PR-781 an ultraflex PRO EX3200 -
Sending the Audio from the Receiver to the Recorder, from the Recorder to the EQ, and sending the Audio from the EQ or Recorder to the Transmitter -
This project enables the transition from DX to contest mode smoother by automating hardware configuration employing a single switch. The tool redirects audio feeds, connects keyer paddles, and includes foot switch capability to enable smooth fighting. Designed for SO2R, it optimises audio signal routing and paddle control based on operating mode. Powered by basic relay switching, the box improves competing efficiency, eliminates AF drive issues, and guarantees smooth, low-noise operation. Future refinements are meant to improve integration. -
Guidelines for optimal speaker placement inside our ham radio shacks -
Reviving the spirit of early ham radio experimentation, the CW Flea is a contemporary Morse code transmitter. Utilizing an Arduino Nano, Si5351 clock generator, and innovative design, this open-source project offers simplicity, flexibility, and easy tuning for aspiring radio enthusiasts. -
Inspired by Heathkit, author aimed to enhance his Yaesu FT-817 with audio and RF processing. Design goals included a compact enclosure, PCB simplicity, matching jacks, a visual meter, and a built-in signal generator. Despite challenges in finding a suitable compressor IC for a 5V DC mic jack, he chose the Analog Devices SSM2165/2166 series. Prototyping with a solderless breadboard, author planned a PCB layout for its versatile performance in communication use.