Arduino interface for TFA9842AJ power amplifier

Dilshan Jayakody writes, “I tested a couple of TFA9842AJ based amplifiers in the last couple of years. The main reason I liked TFA9842AJ is its simple, clean design, wide operating voltage, and high-quality bass-rich audio output.  Thanks to it’s built-in DC volume control circuit this audio amplifier can easily interface with MCU. In this article, […]

Simple I2S stereo decoder with amplifier

Dilshan Jayakody published a new build: In this project we build simple I2S stereo decoder with amplifier. To decode I2S data we use Princeton Technologies PT8211 16bit DAC. KA2206 audio power amplifier is used as driver stage of this system. Structure of this I2S amplifier is self-explanatory from the schematic. We select PT8211 and KA2206 […]

The BF 15+15W open source power amp

Boris Landoni from Open Electronics writes about the BF 15+15W open source power amp: The amplifier revolves around a monolithic integrated circuit for universal use, that is composed of two BF amplifier stages having a bridge output, that may be equated to operational amplifiers connected by a bridge and supplied with a low impedance output […]

LDMOS amplifiers

Pete (N6QW) writes: This project encompasses proving an Arduino Control of a hi Power Linear Amplifier. It is a new departure for N6QW as it has extensive I/O requirements which required moving to the Mega 2560 a Arduino variant that has 56 Digital I/O and 16 Analog Inputs. The on board memory is 256K The […]

Behringer v-tone GMX212 Hybrid tube amplifier mod

Davide Gironi wrote a post on his blog showing how he modified the Behringer v-tone GMX212 Hybrid tube amplifier: For this project I’ve used 12AX7 vacuum tube. This tube is one of the most used for the guitar preamplification. So there are many resources available on web. The first problem i faced it’s the power stage. […]

Tutorial on the theory, design and characterization of a CMOS transimpedance amplifier

Tutorial on the theory, design and characterization of a CMOS transimpedance amplifier from The Signal Path: In this episode, Shahriar and Shayan discuss the design and characterization of a deceptively simple CMOS inverter-based transimpedance amplifier. The the large and small signal behavior of the CMOS inverter is discussed and measured using the Keithley 2450 and […]

Audio multiplexer with integrated amplifier

Audio multiplexer with integrated amplifier project by Matt Winslow, built as a capstone project for his masters in EE: This project is to act as a central hub for switching between audio sources and listening devices. Multiple audio sources can include a phone, computer, TV, etc. The listening devices can include different sets of speakers, […]

DIY 6EM7 Single-Ended Triode (SET) amplifier

A DIY 6EM7 Single-Ended Triode (SET) amplifier from diyAudioProjects: This unique looking hi-fi amplifier was put together by Matt in a vertical wooden chassis that has been styled after early vacuum tube equipment of the 1920s.  The amplifier uses a single 6EM7 tube per channel. The 6EM7 tube has two dissimilar triodes in one envelope.  […]

Cambridge audio A4 stereo Amplifier Mods

Steve did a teardown and refurbishment of a Cambridge Audio A4 Amplifier: In this video, Steve disassembles a Cambridge Audio A4 Integrated Amplifier which he rescued before it was thrown away. The amplifier is refurbished with new electrolytic capacitors and a clean inside before performing a modification to make the dials on the front panel glow. […]

A signal amplifier module for HF

Marcus Jenkins blogged about his radio frequency amplifier project he made using DirtyBoard PCB’s In building QRP HF radios, having an RF signal level amplifier building block is handy. You want 50 Ohm output impedance, some reasonable gain, supply voltage of the usual 10-14V and ease of building using standard parts from your parts bin. Some […]

Low noise amplifier – 100MHz to 300MHz

In this video Hpux735 demonstrates his Sky67015 LNA breakout board: A Low noise amplifier (or LNA) is a special amplifier that is designed to be the first amplifier in a receiver. It is vital that the first amplifier of a receiver has low noise, because the noise of the whole system is dominated by the first […]

App note: 400MHz, 2500V/µs, 9mA single/dual operational amplifiers

400MHz, 2500V/µs, 9mA single/dual operational amplifiers (PDF!) application note from Linear Technology: FEATURES 400MHz Gain Bandwidth Product 2500V/μs Slew Rate –85dBc Distortion at 5MHz 9mA Supply Current Per Amplifier 6nV/√Hz Input Noise Voltage Unity-Gain Stable 1.5mV Maximum Input Offset Voltage 8μA Maximum Input Bias Current 800nA Maximum Input Offset Current 40mA Minimum Output Current, VOUT = ±3V […]