Tag Archives: Audio

4 Channel Portable Audio Mixer

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High-quality modular design, 9V Battery powered – Very low current drawing The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance. The mixer is formed assembling three main modules that can be varied in number and/or disposition… Read more »

Balanced Microphone Amplifier

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We published a design for a stereo microphone preamplifier with balanced inputs and a phantom power supply. The heart of this circuit was a special Analog Devices IC, the SSM2017. Unfortunately, this IC has been discontinued. In its place, the company recommends using the pin-compatible AMP02 from its current product… Read more »

Quality Stereo Wireless Microphone or Audio Link

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This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It’s certainly not the first wireless microphone we’ve ever published but this one is a little different. It’s stereo, providing surprisingly good quality sound. Second, it… Read more »

18W + 18W Stereo Hi-Fi Audio Amplifier (TDA2030)

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2 × 18W Hi-Fi Stereo Power Amplifier based around two TDA2030 ICs. It has good input sensitivity, low distortion, good operating stability and full protection against overloads and output short-circuits. It can be used as a booster amplifier for existing small systems or to drive a second pair of speakers… Read more »

2 Watt Audio Amplifier

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Designed for self-powered 8, 4 & 2 Ohm loudspeakers, Bass-boost switch This amplifier was designed to be self-contained in a small loudspeaker box. It can be feed by Walkman, Mini-Disc, iPod and CD players, computers and similar devices fitted with line or headphone output. Of course, in most cases you… Read more »

Compact High-Performance 12V 20W Stereo Amplifier

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Amplifiers which run from 12V DC generally don’t put out much power and they are usually not hifi as well. But this little stereo amplifier ticks the power and low distortion boxes. With a 14.4V supply, it will deliver 20 watts per channel into 4-ohm loads at clipping while harmonic… Read more »