did you add that muses 02 op amp?Some modifications. Sounds more engaging.
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did you add that muses 02 op amp?Some modifications. Sounds more engaging.
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I can see the opamp change, plus dac chip reference voltage filter caps changes. I'd recommend opa adsitional 100-470uf power filter caps as well, probably these would be the biggest improvememnt overall.did you add that muses 02 op amp?
You can replace the capacitors at the op amp, but a large value of 100-470. µF is too much, 0.5 - 10 µF is enough.I can see the opamp change, plus dac chip reference voltage filter caps changes. I'd recommend opa adsitional 100-470uf power filter caps as well, probably these would be the biggest improvememnt overall.
Sorry, I forgot to mention I mean the small +-12V SMPS module output ripple filtering, increase power clarity on OPA not about channel separation purposes. PSRR is decreasing rapidly w/ frequency even for high-grade OPAs.You can replace the capacitors at the op amp, but a large value of 100-470. µF is too much, 0.5 - 10 µF is enough.
100-470µF was a good option in the 80s, when stages (signal and channels) were separated by resistors.
Which module on the board is the +-12V SMPS? Can you mark where to solder the additional capacitors? Aren't there already 2 pieces of 220uF 16V?Sorry, I forgot to mention I mean the small +-12V SMPS module output ripple filtering, increase power clarity on OPA not about channel separation purposes. PSRR is decreasing rapidly w/ frequency even for high-grade OPAs.
Post in thread 'SMSL SU-1 Stereo DAC Review' https://audiosciencereview.com/foru...msl-su-1-stereo-dac-review.44029/post-1887905Which module on the board is the +-12V SMPS? Can you mark where to solder the additional capacitors? Aren't there already 2 pieces of 220uF 16V?
Thanks. Soldering two additional capacitors in this place with the soic->dip8 base already soldered is quite a challenge. I would have to desolder it with a hot air station and then try to solder the capacitors.Post in thread 'SMSL SU-1 Stereo DAC Review' https://audiosciencereview.com/foru...msl-su-1-stereo-dac-review.44029/post-1887905
Yep, no space w/ dip8 adaptor indeed. Giod idea to find another place, as well use good quality small factor low esr caps (because smps high switching freq).Thanks. Soldering two additional capacitors in this place with the soic->dip8 base already soldered is quite a challenge. I would have to desolder it with a hot air station and then try to solder the capacitors.
But I have another great idea… to solder two capacitors between the +-12V measuring fields visible on the left and ground. There is a lot of free space there.
I have free 270uF 16V oscon's. They will be good in this place.Yep, no space w/ dip8 adaptor indeed. Giod idea to find another place, as well use good quality small factor low esr caps (because smps high switching freq).
Same smps module imho, but strange why these ripple filtering caps missing - or using smaller ones in from su-1.I have free 270uF 16V oscon's. They will be good in this place.
When I wrote earlier that there are 2 capacitors 220uF 16V I confused them with SMSL PS200. SMSL put these capacitors in it on the +-12V line. In SU-1 there are only those at the operational amplifier itself.
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Mass taken from the pad from the bottom of the board. It's not the best solution but it works.Same smps module imho, but strange why these ripple filtering caps missing - or using smaller ones in from su-1.
It's not the best solution but it works.
Everything you wrote is correct. The ground should be connected as close as possible, but my solution also works and there is progress in SQ. Do you know that the comparison you are writing about is not feasible? I need to have another identical device from before the modification and perform an A/B test in the same conditions. Do you expect an improvement in sound measurements? I doubt that anything will be visible in the measurements. At most, you can measure the voltage ripple on the +-12V line with an oscilloscope. Why does no linear power supply manufacturer measure how its power supply affects sound measurements.What do you mean by that? That the device is still functioning or that there is an improvement? If the latter, can you show a before/after comparison? What parameter did improve?
Do you know that the comparison you are writing about is not feasible? I need to have another identical device from before the modification and perform an A/B test in the same conditions.
Sure, I have a Fnirsi 1014D oscilloscope with some kind of FFT analysis, which is useless. On the other hand, a Focusrite Scarlet 2i2 3rd generation audio interface, which has AD sampling parameters worse than SU-1, so I won't make any measurements or they won't be reliable.You could measure the noise level at the DAC output. Expect something in the low microvolts. It would be interesting to see whether the noise level changes. If you have an analyser of sorts (or an oscilloscope with FFT) you could also look at the noise spectrum. Perhaps your caps manage to knock down that litte mains hum spike:
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I doubt you'd be able to hear that, though. With very sensitive headphones perhaps...
TBH, this was likely confirmation bias.After a while I found myself complaining about how terrible many recordings were. Very distorted in the high frequencies especially when pushed hard.
Today I decided to download the latest SMSL driver to give it a try and wow, what a difference!