| No. |
Audio Test Equipment |
Description |
Flags |
| 11 | Pink Noise Generator |
A very clean noise generator for loudspeaker and room acoustics testing |
20Jun
|
| 16 | Audio Millivoltmeter |
For Testing Amplifiers (etc) - An analogue design, 3mV to 30V with dB scale |
21Feb |
| 17 | A-Weighting filter |
For noise measurements. Ideal for use with the AC Millivoltmeter above |
21May |
| 22 | Simple Audio Oscillator |
For use with the millivoltmeter, for testing amps and speakers |
|
| 31 | Full Featured Transistor Tester |
Just the thing to check the transistors for any project |
 |
| 41 | Opamp Design + Test Board |
This project will allow you to quickly assemble an opamp circuit for testing. It is very easy and intuitive to use, and an indespensible tool for experimenters (4 opamps) |
|
| 52 | Distortion Analyser |
A simple distortion meter you can use with an oscilloscope or millivoltmeter, this project will allow reasonably accurate absolute measurements of THD + Noise (Total Harmonic Distortion), and very useful comparative measurements. | 23Dec |
| 58 | Speaker Measurement Set |
This project is based on work done by Siegfried Linkwitz (and is reproduced with his kind permission). The project is in three parts - a cosine burst generator (don't worry, it will be explained), a microphone, and a calibrated peak detector. With a suitable audio oscillator, complex and accurate speaker measurements may be made. This is a fairly complex project, and uses a combination of analogue and digital ICs. The much hoped-for updates have not yet materialised :-( | 24Apr |
| 59 | Self Oscillating Amplifier |
Excuse me?? No, it is not April! Based on a idea from a reader, this project allows you to make a power amp oscillate at a defined frequency, eliminating the need for a low distortion oscillator for distortion measurements. Includes a simplified distortion analyser circuit to suit. | 03Jun |
| 74 | Simple RF Probe |
This simple circuit is indispensible for any RF work. Using just 4 passive components, it uses your multimeter as the measurement display. |
|
| 82 | Loudspeaker Test Box |
A very simple project that allows you to quickly and accurately determine the optimal impedance correction network accross a loudspeaker, to ensure that the crossover actually works as you intended. It also allows you to measure impedance. |
30Sep |
| 86 | Miniature Test Oscillator |
MiniOsc - A high performance test oscillator, with both sine and square wave outputs. Ideal for bench or portable use, and has low distortion (<0.2%) and a battery drain of less than 2mA from a single 9V battery. |
10Apr |
| 106 | hFE Tester for Transistors |
An hFE tester with switched collector currents for the Device Under Test, covering a range suitable for the selection and matching of output transistors for amplifiers such as the JLH Class-A, ESP DoZ etc. (contributed project) |
14Aug |
| 119 | Component Signature Analyser |
Test components while still installed in a circuit - component signature analysis is an easy way to find faulty parts, especially if you have a working circuit for comparison. Features dual voltage and current ranges, and connects to your oscilloscope (in X-Y mode) to show a graphical indication of the circuit node. |
18Dec |
| 121 | Inductance Adapter |
Measure inductance for crossover coils using your multimeter or a frequency counter. Several variations for you to experiment with and end up with a useful tool. |
18Dec |
| 124 | High Power Dummy Load |
A dummy load for testing amplifiers (and optionally power supplies). In the full version, it offers impedances from 1 ohm to 16 ohms, with a free-air power rating of up to 360W. This can be extended easily by using cooling as described in the article.  15 Aug 2009 |
15Aug |
