How to make a simple 1 watt audio amplifier (LM386 based)

A tutorial on making an LM386 audio amplifier circuit from Afrotechmods: A tutorial on how to use the popular LM386 class AB audio amplifier IC to build a simple mono 1 watt audio amplifier. It costs less than $3 in parts! There is also a brief discussion of how to use high pass filters to […]

A simple push-pull audio amplifier using russian rod tubes and power transformers

KA7OEI blogged about a simple push-pull audio amplifier using russian rod tubes and power transformers: Many years ago I’d read about the type of tube that is now often referred to as a “Gammatron” – a “gridless” amplifier tube of the 1920s, so-designed to get around patents that included what would seem to be fundamental aspects […]

Mullard 3-3 amplifier project (part 1)

Dilshan Jayakody has published a new build, a Mullard 3-3 amplifier project: Mullard 3-3 is quiet popular 3W tube amplifier introduced by Mullard Ltd in 1956. A schematic and design detail of this amplifier is available in “Mullard Circuits for Audio Amplifiers” book and in National Valve Museum article. This amplifier is based on EF86, EL84 vacuum […]

Digitally controlled 2.1 channel analog audio power amplifier

Dilshan Jayakody  writes: This article introduces high quality digitally controlled 2.1 channel analog audio power amplifier system. This project is mainly based on TDA7377 AF power amplifier and PIC18F452 8bit microcontroller. Basic features of this receiver are 2 × 6W + 20W audio output power, ±14dB bass and treble controls, fully configurable +35dB bass booster […]

6AS5 and 6N2P vacuum tube base guitar amplifier

Another Dilshan Jayakody’s cool project, a vacuum tube base amplifier project based on 6AS5 pentode and 6N2P dual triode: This is our first vacuum tube base amplifier project and this project is based on 6AS5 pentode and 6N2P dual triode. Schematic of this project is not designed by us and we got it from web. We got […]

Digital audio amplifier with PLL synthesized FM radio

Another open source hardware project by Dilshan Jayakody the digital audio amplifier with PLL synthesized FM radio: This is high quality stereo digital audio amplifier with PLL synthesized FM radio receiver. Some of the high level specifications of this receiver are listed in below: Audio output power: 4W + 4W (with 8ohm speakers) Input sources: FM and 3 […]

Smart audio box

Dilshan Jayakody has written an article about his open hardware project known as Smart Audio Box (SAB): Smart Audio Box (SAB) is microprocessor controlled audio switch and amplifier system, which is specifically design for audio composers and for audio engineers. SAB consist of 4 high impedance stereo inputs and two output modes. One output mode […]