We've run out of cases, and since we UV print the case artwork on demand, this means nothing can ship until new cases arrive. They are in the air, and should be arriving via FedEx later this week. Orders can be placed, but cannot ship until the cases have arrived. Sorry for the delay.

Blog Entries

Cloud Database

Cloud Database

Let's say the first 50 units of your new widget prototype have come off the line. You're excited because this is the first time you've built more t...
Speaker Impedance Measurements

Speaker Impedance Measurements

In late 2018 a plug-in was added for making speaker impedance measurements. This post takes a look at additional hardware requirements to be aware ...
Rub and Buzz

Rub and Buzz

QA401 release version 1.81 (located HERE) adds speaker Rub and Buzz testing in the form of a plug-in. Rub and Buzz refers to a speaker test that ca...
First Look: Infineon MERUS MA12070

First Look: Infineon MERUS MA12070

The growing portable speaker segment is resulting in some solid Class D innovation from silicon vendors. A new part from Infineon is especially int...
Release 1.791 and Portable Speakers

Release 1.791 and Portable Speakers

Release 1.791 (located here) has some tools for testing portable speakers & speakers in general. The portable battery-powered speaker segment i...
Automating EQ Tests using Masks

Automating EQ Tests using Masks

Release 1.79 is the latest release of the Q401 application (located here) and release 0.981 is the latest release of Tractor (located here). The QA...
Quickly Characterizing A Tone Knob Using Exponential Sweeps

Quickly Characterizing A Tone Knob Using Exponential Sweeps

A quick video to show how quickly a tone knob can be characterized using features that have been introduced in the last few releases. 
QA401 Release 1.760

QA401 Release 1.760

Release 1.76 for the QA401 should be out early next week and features the ability to build and apply masks to acquired data and deliver a pass/fail...
Basics: Power Amps

Basics: Power Amps

This post covers some of the more important points to consider when measuring power amps. From the setup to the measurements, if you are looking to...
Characterizing LDO Noise: Part 3

Characterizing LDO Noise: Part 3

In Part 2 of the examination of LDO noise, we ran into the limits of the QA401 while evaluating the output noise of the LT3042. And this shouldn't ...
QA401H, REST and Python

QA401H, REST and Python

Release 0.94 of QA401H is up at Github. Release 0.94 moves a step closer to shipping the headless version of the QA401 control software, and measur...
Characterizing LDO Noise: Part 2

Characterizing LDO Noise: Part 2

Previously we used the QA350 microvolt DVM to look at the standard deviation of different types of LDOs. That measurement helped us understand the ...