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QA401 Audio Analyzer
QA450 Programmable 8/4 Ohm Load
QA350 Microvolt DC Volt Meter
QA150 High Side Current Sense Amp
QA101B Mixed Signal Oscilloscope
Recent Blog Posts
Automated Amplifier Testing with Tractor
April 20, 2019
We previously went through a quick characterization of a tube guitar amplifier in the blog post located here, with a promise that we’d come back an...
Release 1.726 Graph Types
March 28, 2019
The graphing plug-ins have been re-named and re-organized for 1.726. This post will highlight the types of graphs than can be created. Until the do...
TI TPA3255 EVM
March 25, 2019
Later this week 1.726 will release, with a lot of changes to plug-ins and graphing of stepped tests. The aim over the last month has been to dramat...
Fast Tube Amp Characterization
March 14, 2019
A look at how to quickly characterize a low-cost, 5W guitar amplifier. And in case you missed it previously, a video looking at automation and me...
Rapid USB DAC Evaluation
March 04, 2019
DACs--the standalone kind and not the integrated-circuit kind--have been part of home systems for more than a decade now. They can pose a bit of a ...
February 17, 2019
In release 1.709 for the QA401, the ability to graph distortion versus level for a given frequency was added. This is achieved using the new Test P...
OPA2156: HiFi in CMOS
February 07, 2019
The OPA2156 is a new, high-performance op-amp from TI. Normally, that's not newsworthy because higher performing parts are coming out all the time....
January 30, 2019
ASIO401 is an open-source ASIO driver for the QA401 created by Etienne Dechamps. Aside from some input I had on how the QA401 wire protocols operat...
Low-Cost Test Setups
January 28, 2019
A common question we get is "Can I run the QA401 on an older machine?" In general, as long as the PC is running Windows 10 the answer is "yes." The...
January 24, 2019
NAMM is the premiere event for those that manufacture musical instruments and accessories to connect with buyers--from independent music shop owner...
Estimating Circuit Yields
December 30, 2018
A common exercise for all design engineers is understanding the "spreads" or yields on their circuit performance. When using SPICE, this can be don...
QA401 Headless & Linux Support
December 06, 2018
There are two recurring requests for the QA401 platform: First, people ask if they can easily control the hardware from a language like Python, Mat...