BTW...beefing up the Power supply of the curve tracer will allow the system to match devices up to 5A Current.
Really rare the need for such a high current on one device...but I think it is still cool feature to have.
Really rare the need for such a high current on one device...but I think it is still cool feature to have.
You should have tried algol 🙂 Programming language generations - Wikipedia, the free encyclopedia
P.s I'm still (now for more then 40 years) a computer programmer and system designer. And I do hate computers, and I do love algorithms.
P.s I'm still (now for more then 40 years) a computer programmer and system designer. And I do hate computers, and I do love algorithms.
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oh BTW...I forgot to mention....I am still working on Masterpiece....I am working on the PCB, entering schematic in Capture and Creating Library for Cadence Allegro to start laying PSU and Main Board out.
Stay tuned hopefully in the next week or so it will be done.
😎
Stay tuned hopefully in the next week or so it will be done.
😎
We have discussed how to measure PSUs and why they have an effect on sound.
Maybe this can shed some light on it :
DIY Test Equipment for Audio and Ham Radio Enthusiasts
Maybe this can shed some light on it :
DIY Test Equipment for Audio and Ham Radio Enthusiasts
Has this test been done with real builds or are these simulations ?
Where is FdW shunt ?
Can't do the real measurement, I do not own the AP 🙁 but if the simulation helps then here are the results. Also I must note: the specified test (here DIY Test Equipment for Audio and Ham Radio Enthusiasts) is not a PSRR-test, it is (I would say), a current injection resistance(CIR) test 🙂. Also, series regulator PSU's may (or may not) have a high 'CIR', but I am sure that a good shunt regulator (having a good CCS) will (probably) have a better PSRR than (probably) any series PSU 🙂 (or I will eat my hat 🙂).
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There was a listening test on PSUs in Linear Audio.
They used a rather simple Borbely line stage that did not have much PSU rejection.
The outcome was rather suprising.
The Jung-Didden series regulator did best and the Salas shunt did quite poor.
Usually a shunt should work better but that was not the case here.
So a search was undertaken why that was.
A distortion analysis by FFT of the output voltage correlated with the sound impressions.
The PSUs that did not have high order distortion artifacts did best.
There was a listening test on PSUs in Linear Audio.
They used a rather simple Borbely line stage that did not have much PSU rejection.
The outcome was rather suprising.
The Jung-Didden series regulator did best and the Salas shunt did quite poor.
Usually a shunt should work better but that was not the case here.
So a search was undertaken why that was.
A distortion analysis by FFT of the output voltage correlated with the sound impressions.
The PSUs that did not have high order distortion artifacts did best.
wow!! This is pretty interesting.
Thanks for sharing it as it helps understanding correlation between good sounding PSU and measurements.
I am wondering if anybody here has the gear to perform these tests.
Technically, correct me if I am wrong, low distortion signal gen can be fed cap coupled to the output.
But then I don’t understand where the distortion gets measured!?
But then I don’t understand where the distortion gets measured!?
posted mine while you were posting yours 🙂
Do we need AudioPrecision System to perform the output injection's test?
I have varios FFT analyzers that go down to better then -130dB.
I work mostly nowadays though with a Quant Asylum that is good enough.
I work mostly nowadays though with a Quant Asylum that is good enough.
So it is a loop test almost since the output of the generator is cap coupled to the output of the PSU and output of the PSU gets connected cap coupled again to the input of the Analyzer.
Quantum is a pretty nifty product, I saw it some time ago and found it interesting.
However looking at the specs, a good quality soundcard like M-Audio pro-fire or EMU have little better figures.
I use spectra plus and noise floor is down to -140-150dB.
If I understood correctly, this is a test that doesn’t require injection transformer with loop analysis where you must have a network analyzer type of instrument.
If so, I can perform tests too but I got to say that given I am working on schematic, simulation, layout, assembling, tests and who knows what’s more….plus I work full time….ahahahah…..time is a little issue with time for me too.
Anyway that post was very, very instructive, thanks again for sharing it with us.
Quantum is a pretty nifty product, I saw it some time ago and found it interesting.
However looking at the specs, a good quality soundcard like M-Audio pro-fire or EMU have little better figures.
I use spectra plus and noise floor is down to -140-150dB.
If I understood correctly, this is a test that doesn’t require injection transformer with loop analysis where you must have a network analyzer type of instrument.
If so, I can perform tests too but I got to say that given I am working on schematic, simulation, layout, assembling, tests and who knows what’s more….plus I work full time….ahahahah…..time is a little issue with time for me too.
Anyway that post was very, very instructive, thanks again for sharing it with us.
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