you should tie all of them with return paths or you will catch all the noise as everything becomes a loop antenna.
I don't know what you mean but even in this very first configuration, amplifier is playing nicely!
Inside in an Simpelstark amplifier. - YouTube
Inside in an Simpelstark amplifier. - YouTube
I guess thats the hallmark of valery`s error correction system which will correct everything as per the input. Novel design.
I've been too busy with work to get the AX3 back on the test bench. Hopefully I have some time soon.
Did you do a stereo version or just a mono-block? I'm interested to see how people are making out with dual-mono designs with SMPS. It sounded like Pinocchio was having some noise / ground loop issues, but gave up and went to conventional supplies.
After almost a year of drastic changes in life and a relocation of my lab I hope to get back at testing the AX3 version of the Simpelstark soon. The lab still has boxes of parts heaped up so working in it is still a rough go.
I tested some modifications to the ODNF circuit using high speed op amps but they didn't go well. As usual high speed op amp in audio bring on high speed oscillations. This will be revisited at some point, but not now. The goal is to extend the frequency range that the ODNF circuit is effective in to the full audio frequency range.
Next step will be to to do some formal measurements and some proper listening tests on some better speakers. The test speakers I used to use died a horrible death in some other testing so that's a bit of a hurdle right now too.
Due to the power output levels of this design it will likely be a good candidate for SMPS, otherwise this will weigh a lot in stereo / dual-mono configuration. This is why I'm curious how others are making out with SMPS.
I tested some modifications to the ODNF circuit using high speed op amps but they didn't go well. As usual high speed op amp in audio bring on high speed oscillations. This will be revisited at some point, but not now. The goal is to extend the frequency range that the ODNF circuit is effective in to the full audio frequency range.
Next step will be to to do some formal measurements and some proper listening tests on some better speakers. The test speakers I used to use died a horrible death in some other testing so that's a bit of a hurdle right now too.
Due to the power output levels of this design it will likely be a good candidate for SMPS, otherwise this will weigh a lot in stereo / dual-mono configuration. This is why I'm curious how others are making out with SMPS.
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I am doing it as Mono-Block, I don't have parts for the other channel to build.
I don't know which SMPS was used by Pinocchio indeed, Pinocchio also used the new version of my SMPS with other amplifiers and everything was super quiet.
I have many SMPS options that may fit perfectly with this amplifier.
Thanks
Do was saying he had used a few of your supplies and really liked them. This was his first dual-mono attempt with two of your supplies (I'm not sure which ones) if I understood him correctly and was having problems in that format.
It was the old version SMPS600 then.
I don't know if he tested the new version yet. He also mentioned same noise issues with other smps units if I remember
I don't know if he tested the new version yet. He also mentioned same noise issues with other smps units if I remember
Yes, with the new SMPS in a single chassis it is really quiet. It is in a different amplifier but the issue I had with the old SMPS was with most amplifiers built in dual mono single chassis. Now it is real quiet.
Do
Do
So the new design works well in dual mono then? Do you have a link to it? This might be good to test with the AX3.
Hi Jeff,
My sincere sympathy for your loss. English is not my native language so I hope it is proper way of saying.
Do
My sincere sympathy for your loss. English is not my native language so I hope it is proper way of saying.
Do
Hi Jeff,
To answer the question about smps, the test was on a different amplifier, not the SimpelStark. I’m not changing the SimpelStark as it is a fully completed amplifier. Will most likely do this on the new version. I could send you the SMPS if you want to test them. Just need to check the voltage of them.
Thanks
Do
To answer the question about smps, the test was on a different amplifier, not the SimpelStark. I’m not changing the SimpelStark as it is a fully completed amplifier. Will most likely do this on the new version. I could send you the SMPS if you want to test them. Just need to check the voltage of them.
Thanks
Do
when using high speed opamps do put an output resistor take 51ohm in series after the feedback resistor of the high speed opamp in the ODNF circuit and see if it stabilizes. Im curious to know that if it stabilizes. Pls let me know.