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Audio Distortion Meter Circuit with Diagram
https://www.circuitstoday.com/audio-distortion-meter
Connect the out put of Amp to points P1 and P2 of the circuit. First, select the required load resistance using S1. Slide the switch S2 to CAL position (to left as in circuit). Note the reading on the AC meter as V cal. Now slide S2 to THD position (right). Adjust L1 and R5 to get the minimum meter reading and note that reading as V min.
Distortion Meter and Audio Interconnect Tester | audioXpress
https://audioxpress.com/article/distortion-meter-and-audio-interconnect-tester
One is a short silver jumper with decent gold RCA plugs. It reads 6.25dB above the noise floor on the meter and has the lowest noise and distortion. The second is a video coax with cheap gold RCA connectors. It has much more noise and distortion and reads 11dB on the meter. The last is a cheap audio cable with cosmetic gold-plated connectors.
HOWTO - Rockford Fosgate
https://www.rockfordfosgate.com/rnt/rnw/docs/1055/2012_rftech_diydistortionmeter.pdf
self Distortion Meter for around $30 with parts found at your local Radio Shack™. You’ll need a mini-amplified speaker and a couple of voltage dividers. These instruc-tions include schematics for building the voltage dividers along with diagrams on how to connect and use them with your mini-amplified speaker.
Low Distortion Signal Generator. Part 1. - renardson-audio.com
https://renardson-audio.com/gen.html
The distortion specification was reasonably good, but not good enough for direct distortion testing of my more recent amplifier designs. Typical figures are 0.006% at 20Hz and 0.007% at 20kHz. Here is a simplified circuit diagram of the sinewave generator:
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