Doz did a repair of a Dual PA5030 Integrated amplifier and documented the whole process on his blog.
Tag Archives: amplifier
D01: 2*15W guitar amplifier built using salvaged parts
Davide Gironi writes, “The D01, litterally Discarica 01, is a guitar solid state amplifier build from salvaged parts.” See the full post on his blog. Check out the video after the break.
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, […]
ATtiny13 – 8bit mono class D amplifier
Łukasz Podkalicki shared a how-to on building a Class D amplifier on ATtiny13: I always wonder whether it is possible to make an amplifier of class D on ATtiny13 or not. Some time ago I found George Gardner’s project based on ATtiny85 – TinyD. It was a sign to start challenging it with ATtiny13. It took me […]
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 […]
10MHz distribution amplifier
G4FRE built a 10MHz distribution amplifier: I have had a need for a distribution amplifier for a while now. Searching around I found the design by G4JNT in Radcom, which filled my needs. I redrew the circuit for 4 outputs and had PCBs made. (if you want one contact me!) I now have the units […]
Adjustable gain LNA
Mare published a new build: Low noise amplifiers are very useful. I built one with single BFG425W transistor with adjustable bias current. Project info at Mare & Gal Electronics homepage.
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 […]
Automatic volume tracking for a TV
An automatic volume tracker by KA7OEI: It occurred to me that I did have a reference on which I could base an outboard volume control: The internal speakers of the TV. I surmised that I could “listen” to the audio level coming out of the speakers and based on that, adjust the volume of an outboard amplifier. […]
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 […]
WA2EBY IRF510 amplifier
Flathagen has published a new build: The WA2EBY amplifier is a famous linear amplifier project published in QST in March and April 1999 by Mike Kossor WA2EBY. As this amplifier can give up to 50W out with 1W drive, it is a perfect pair for my Softrock RXTX amplifier. The articles can be found on […]
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. […]
Simple small QRO for HF
Marko Pavlin has been working on a HF amplifier project: I followed the ARRL Homberw challenge 50 watt aplifier entry. It is low cost, simple HF linear amplifier designed and built by the author as an entry in the ARRL’s 2009 Homebrew Challenge contest. The requirements of the amplifier were: 40 meter band 50 watt output […]
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, […]
50W LM3886 power amplifier
A 50W LM3886 power amplifier project from Electronics-DIY: This is a second revision of 50W LM3886 power amplifier that is used to power two bookshelf speakers. The sound produced by LM3886 chip is excellent so I decided to make another amplifier with it. The schematic is based on the schematic in the datasheet of the […]
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 […]