Thanks for the review Gary. It helps me to confirm that my design goals were really met, as my impressions alone are not enough.
🎉Ohh Yeah Gary!!🎉
Congratulations on your drama free power up. Hey, how did you know what I wanted to say?
I’m impressed that your amp is so well behaved and quiet using an SMPS power supply.
We need some amp porn!
If anyone was on the fence making a decision about what amp to build next, your experience might help push them to the ‘Build Bliss’ side.
Enjoy the tunes!
Cheers,
Vunce
Congratulations on your drama free power up. Hey, how did you know what I wanted to say?
I’m impressed that your amp is so well behaved and quiet using an SMPS power supply.
We need some amp porn!
If anyone was on the fence making a decision about what amp to build next, your experience might help push them to the ‘Build Bliss’ side.
Enjoy the tunes!
Cheers,
Vunce
Meanwell LRS-50-15 is a very affordable and good solution to have regulated power supply. Paired with AmyAlice filters, it provides low noise. 👍
Amplifier PCB design uses two outer copper layers as a static shield. That provides additional immunity to RF EMI radiated from the SMPS supplies, so everything should be fine.
I built the F8 with SMPS/AmyAlice and it is dead quiet, so I used it again on this amp - dead quiet again.
Certainly a cheap way to go.
Certainly a cheap way to go.
Hmmm….
I’ve tried using SMPS for amplifier projects before and in most cases haven’t been satisfied.
But, never used the AmyAlice filter, maybe this is the missing ingredient? I’ll have to give AA a try! 😉
I’ve tried using SMPS for amplifier projects before and in most cases haven’t been satisfied.
But, never used the AmyAlice filter, maybe this is the missing ingredient? I’ll have to give AA a try! 😉
Now that looks even more interesting, will be getting some of those made. Thanks for the link - was not aware of that thread at all..
Building any of the more popular diy speakers from this site, would improve your sound tremendously. NS10 Has very few qualities compared to even the most modest of good designs.
Cheers!
Those are just my small test bench speakers at my workbench. Accurate, but not taking up too much space.
One SMPS is for the pos supply and the other SMPS is for the neg supply. So the + on pos SMPS is your +DCV. The - on the neg SMPS is your -DCV. Then you connect the - on the pos SMPS to the + on the neg SMPS - this is your 0VDC. I then connect a CL60 from the 0VDC to chassis earth.
I then wire the AmyAlice pos/ neg filters between the 2 SMPS and the amp DC rails. Remembering that you have to make a neg filter by inverting the diode and 2 electro caps on the neg filter pcb. The AmyAlice as shown is a pos filter - but simple to make into a neg filter.
I then wire the AmyAlice pos/ neg filters between the 2 SMPS and the amp DC rails. Remembering that you have to make a neg filter by inverting the diode and 2 electro caps on the neg filter pcb. The AmyAlice as shown is a pos filter - but simple to make into a neg filter.
Can you clarify the connection points for the decoupling ground, speaker ground, and signal ground?
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I created a chassis isolated star point ground connection for all the 0VDC connections.
Connections to that point are:
Left channel speaker GND
Left channel decoupling ground from pcb
Left channel signal ground from pcb
GND points from both AmyAlice filter boards
Right channel speaker GND
Right channel decoupling ground from pcb
Right channel signal ground from pcb.
Then from that star point gnd I wired a CL60 to the chassis earth, which is connected to the IEC mains inlet connector earth terminal and the earth terminal on both AMPS supplies.
If you have the space, you could have a pos and neg AmyAlice filter pcb for each channel - I just used one of each to feed both channels.
Connections to that point are:
Left channel speaker GND
Left channel decoupling ground from pcb
Left channel signal ground from pcb
GND points from both AmyAlice filter boards
Right channel speaker GND
Right channel decoupling ground from pcb
Right channel signal ground from pcb.
Then from that star point gnd I wired a CL60 to the chassis earth, which is connected to the IEC mains inlet connector earth terminal and the earth terminal on both AMPS supplies.
If you have the space, you could have a pos and neg AmyAlice filter pcb for each channel - I just used one of each to feed both channels.
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Consider also that capacitance multiplier output impedance is high and good performance relies on the large output capacitor, as is with any unregulated supply.
https://www.diyaudio.com/community/...-at-the-capacitance-multiplier-output.389938/
Indeed, agreed. Hence, I will be using your R25 or R21/Prasi combos in my best Class A builds and reserve capacitance multiplier based supplies for my other more “experimental” Class A builds or prototypes. In addition, although rare, capacitance multiplier based supplies have interesting recovery issues that occur during momentary brownouts of the AC line (a rarity in my neighborhood) but nonetheless should be mentioned. When they do occur…HUMMMMM!
For large Class AB designs, especially those with very high PSRR I think I will stick with large cap banks, i.e. Wolverine, etc…unless I am more concerned about voltage rail sagging at extreme power output levels.
The absolute lowest supply impedance is an incredibly important factor to PS design in serious amplifier (and preamp) designs imho.
Best,
Anand.
For large Class AB designs, especially those with very high PSRR I think I will stick with large cap banks, i.e. Wolverine, etc…unless I am more concerned about voltage rail sagging at extreme power output levels.
The absolute lowest supply impedance is an incredibly important factor to PS design in serious amplifier (and preamp) designs imho.
Best,
Anand.
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You’ve probably already seen this but consider it also for your future builds. It was offered to the community by member stuartmp on the Wolverine build threads. He also has a Gnd lift board on their website as well.
Best,
Anand.
I fully agree. Class AB designs with high PSRR will have no real benefit from the regulated power supplies, although you could measure something as a difference.