DIY Antennas, QRP, SDR & Ham Radio Projects from VU3DXR
Audio compressor circuits and DIY audio projects including VCA, op-amp compressors, and signal dynamics control for ham radio and audio electronics.
This microphone audio compressor uses an LM324 op-amp with multi-stage amplification, diode-based gain control, and buffering to regulate signal levels. It smooths volume by reducing loud peaks and boosting weak input, improving clarity for voice, recording, and radio applications with a stable 12V supply
This microphone audio compressor for SSB radio combines a low-noise preamplifier with automatic gain control to maintain consistent speech levels. It boosts weak audio and limits peaks, improving average modulation and clarity without distortion, making transmissions more intelligible, especially in low-power HF setups.
This article explains why the MXR Dyna Comp, a guitar compressor pedal, is not suitable for SSB amateur radio use despite being a compressor.
It points out key issues like impedance mismatch, since guitar pedals expect high-impedance inputs unlike microphone or line-level signals used in transceivers. It also highlights that the pedal’s frequency response and controls are designed for musical audio, not narrowband voice signals used in SSB.
The LM1458 is a dual operational amplifier (op-amp) that finds applications in audio amplification and other circuits. Let’s explore how you can create a simple Microphone compressor using the LM1458. To get greater transmitting performance from your ham radio transceiver, we need to keep the modulation level constant, regardless of your voice level. With the compressor […]
This microphone compressor circuit utilizes a two-stage amplification design for dynamic range control. Initially, the input signal enters through MK1, a microphone input connector. Subsequently, the signal passes through C1 and C3 coupling capacitors for DC blocking. The first amplification stage employs Q1, a 2N3904 transistor configured as a common emitter amplifier. Meanwhile, R1 provides […]
This dynamic speech compressor with audio preamplifier combines a transistor-based preamp and op-amp gain stage with diode-controlled compression to regulate signal levels. It automatically reduces loud peaks and boosts weak audio, delivering consistent output with adjustable threshold, attack, and release timing for clear speech and improved transmission quality.
Simple audio compressor for SSB HF Radio rigs An audio/speech compressor is a device that reduces the dynamic range of the audio signal. This means that it makes the loud parts of the signal quieter and the quiet parts of the signal louder. This can be useful for SSB HF radio rigs because it can […]
Stop fading into the noise! Build this simple, low-cost speech compressor using the LM324 quad op-amp to ensure your voice stays loud and clear on the airwaves.
Audio processors and Speech compressors are important in SSB radio because they can help improve the transmitted signal’s quality. Here are complete resources and links available in the internet connected to Mike Preamplifier/Speech compressors/Speech Processors Dyna Audio compressor Noise Canceling Electret Microphones – WB9YBM Microphone Speech Processor Microphone Amplifier with ALC Audio compression with transistors […]
This article presents a simple, low-cost audio compressor circuit designed to stabilize microphone signal levels. It reduces dynamic range by softening loud sounds and boosting weak ones, improving clarity and intelligibility. Built with basic components, it suits amateur radio and DIY audio setups, offering consistent output without complex or expensive hardware.