Simple 2N3904 microphone preamplifier for uBITX V3–V6 transceivers that fixes low mic audio and restores full transmit power. Powered from the MIC+ line with adjustable gain for clean, natural SSB modulation.
audio
The audio category collects everything related to sound in your shack: microphone preamplifiers, speech processors, tone generators, practice oscillators, test signals, and audio troubleshooting guides. You’ll find circuits like simple 2N3904 mic preamps for uBITX, audio peak limiters, speech processors, UJT code practice oscillators, pink noise generators, and sine‑wave sources, all tuned for amateur‑radio and hobby use
Simple Speech Processor for Homebrew SSB Transceivers
Simple speech processor for homebrew and QRP SSB transceivers that boosts average talk power while preserving natural audio. BF245 mic preamp, dynamic compression stage, and TL071 output amplifier improve readability and on-air presence.
Simple Receiver S-Meter Circuit for Your Radio
Stop guessing signal strength! Build this easy, low-cost S-Meter circuit to give your homebrew radio a professional visual indicator for incoming signals and tuning.
Simple UJT Morse Code Practice Oscillator Circuit
Learn to build a simple UJT Morse code practice oscillator with basic components. Perfect beginner electronics project for ham radio enthusiasts.
Pink Noise Generator Circuit Using 741 Op-Amps
Learn how to build a pink noise generator using 741 op-amps for audio testing and frequency response analysis, a simple Pink Noise Generator Using 741 Op-Amps
Build a Simple Speech Processor Circuit Using LM358
A speech processor is an essential component in amateur radio and audio systems that enhances voice clarity and intelligibility. This comprehensive guide will walk you through building a simple yet effective simple speech processor circuit using the LM358 operational amplifier and discrete components. A speech processor is an electronic device that modifies audio signals to […]
Log audio Compressor Circuit for Smooth Natural Compression
Discover how to build a Logarithmic Audio Compressor circuit for smooth, natural-sounding audio. This guide features a high-performance schematic using precision op-amps and log-antilog transistors to prevent distortion while maintaining consistent signal levels for amateur radio and pro-audio projects.
Audio Clipper Circuit Using BC547 and 1N914 Diodes
Learn how to build a simple and effective Audio Clipper Circuit using BC547 transistors and 1N914 diodes. This DIY guide covers schematic details, component selection, and how to prevent overmodulation in amateur radio transmitters for clearer, peak-limited audio.
Microphone Preamplifier with Audio Peak Limiter
The circuit shared here is a Microphone Preamplifier with Audio Peak Limiter, often used in audio recording, amateur radio, or intercom systems. It amplifies weak microphone signals and includes peak clipping diodes to prevent signal distortion from loud inputs. Looking to boost your microphone signal while keeping audio distortion in check? This two-stage transistor microphone […]
TL081 Speech Processor for HF Rigs
The main goal of TL081 Speech Processor circuit is to boost, shape and process your voice signal before sending it to the radio transmitter