If all you want to do is find out if your gizmo is linear or not and an approximation to how linear it is.... any one of them would be fine. BUT thats not my primary reason to have several of them. And, I learned they dont all give the same level of accuracy in seperating and measuring individual harmonic levels at low distortion levels and some of the why.
Since i dont have a commercial product to test against a spec, I just do it for the intellectual fun of it to see what I can learn.
Same with getting a lot of specialize ac power test equipment together just to see what might be on the ac power lines, type of noise, where it comes from and solutions... and did it affect the sound? I learned a lot which i am happy to share. I've been doing this way since I was a kid... then working at LLNL was more of the same. Read, test, measure, explore. Heaven on earth for me.
Thx-RNMarsh
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Thanks for your replies to my question. I would like to show simulated results of AM modulated input to 3 very different power amplifier topologies.
1 is All Mosfet, no global feedback, complementary-differential input amplifier with balanced output.
2 is complementary-differential JFET input amplifier with BJT output, single-ended.
3 is a very traditional, All-BJT design with simple differential input and single-ended output.
Input signal was a 1MHz carrier AM modulated at 90% by 10kHz. 1Vpeak amplitude for amplifiers 1 and 2, reduced to 500mVpeak for amplifier 3. Results are attached. For input amplitude reduced to 100mV, the order of influence of AM modulated input remains unchanged, amplifier 1 is best and 3 is worst. Images from left to right: Amplifier 3, amplifier 2, amplifier 1.
Attachments
Yes, agreed.
Perhaps more revealing is to compare pure resistance loaded to simulated loudspeaker network loaded.....one experiment I need to get around to.
Dan.
Actually, 2X is about the best one can do for music tracks, as a general rule ...
That was a memory of Shannon's lossless coder theory, I don't use FLAC myself.
Non taken . Will amazon be selling more than 0and1 of your Linear Audio ?
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Probably not for the foreseeable future. I have ample stock myself, and while the Amazon process is painless for me, they also retain a sizeable part of the sales price. Was more like an experiment.
jan
But with no other practical purpose than to skim a boat over a body of water at high speed. At least audio equipment delivers music.
Was the lake decently calm today?
se
That's ok. When I was a young buck, I read Walt Jung's Audio magazine article on how to swap op amps and caps to get improved sound from my Philips/Magnavox CD Player. I ordered the parts from Digi-Key and when they arrived, went on a 14 hour session of de-soldering and soldering. I didn't even stop to eat and was pretty woozy at the end.
But boy, I was very proud of the result!
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