Project 19

The power output for Project 19 is about 275Wrms into an 8Ω load with a ±75VDC power supply. More »

Project 27

Project 27 is rated 225Wrms at 8Ω inspired by the book “Designing Audio Power Amplifiers” written by Bob Cordell. More »

Project 18

The output stage consists of TO220-packaged power MOSFETs with a power output of 100Wrms at 8Ω and higher at 4Ω load with a ±50VDC power supply. More »

Project 20

The power output of Project 20 is about 195Wrms into an 8Ω load with a ±64VDC power supply. More »

Project 21

An LME49811 project driving a CFP output stage in Class A mode. More »

Project 32

Project 32 uses a complementary-symmetrical input and a CFP output stage. Delivers more than 200 watts at 8Ω. More »


Welcome to BuildAudioAmps

Thank you for visiting.

The previous series of audio power amplifier projects that I was working on was using the LME498xx series of high voltage input stage drivers. I have posted several of them starting with Proj8, Proj11~25 and finally in Proj39~42, but there’s really more than that and have not been posted in the website as shown in the Tinkerer’s Workshop. It all started with Proj8 when I had the PCB fabricated professionally  to verify basically its layout quality. As a result of the first build the audio quality it reproduced and represented was very impressive!

At present I’m working on a new series of audio power amplifier projects that uses an opamp at the front-end input stage of the amplifier. Currently, there are 16 amplifiers so far that have been built and tested starting with Proj62.

Here’s a look at some of the completed projects:

This one is rated at 100 watts using Linear Technology LTC6090 that’s driving a pair of ThermalTrak transistors.


The next one is another 100-watt amplifier using an Analog Device ADA4700-1 connected to a complementary pair of Darlington transistors from Sanken.


This one is a 100-watt amplifier using Linear Technology LT1166, which controls the bias and effectively eliminates the matching of the QFET MOSFETs.