Mauro, when debating about it, also said that since the entire circuit is 'floating' the only important noise to deal with is the differential one, if I remember correctly.
As always, you're welcome 🙂
My new PS for LM318 has a very similar effect of LF01 described one, did you do some test with my supply?
If the effect will sums up it could be very interesting...
BTW, did you managed to ship my LF01s? 😉
I think I'm going to stick a larger value to see how things go. Generally, it's like snubbering, one optimum value.
Nearly two year ago I built the LM3886 Ultimate BOM. Now it seems quite far from "Ultimate" 🙂
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Well, I've recently posted a Final Ultimate BOM here... but, as you know my BOM has revision numbering... 😉
Jokes apart I consider that BOM final, it could only be better defined about 'audiograde' resiststors.
A lot of what we're talking about now are project variations like new compensation schemes, new PS, new PCBs and a deeper analysis on Mauro's work.
Did you see my thread on my My_Ref derivate? It would be nice if you'll join the beta build. 😉
This design is so interesting in a way that it is sensitive to many things. I am interested to see how good this can get with not too exotic components.
Dario,
I was planning to put your Rev-E mod in the same amps as the LF01. Since my red TP V1.2 boards also have the Sonicap and BG parts, I'm going to try those first.and get a comparison. If you find combining both in one build is good please let us know. For now I would like to spend a bit of time with both flavors.
I was planning to put your Rev-E mod in the same amps as the LF01. Since my red TP V1.2 boards also have the Sonicap and BG parts, I'm going to try those first.and get a comparison. If you find combining both in one build is good please let us know. For now I would like to spend a bit of time with both flavors.
If you exclude Mundorf caps (which have industrial alternates) my BOM indicates ordinary industrial components from Mouser catalog (except Elna RJHs, also industrial caps).
A careful selection of industrial components gives, IMHO, a very very good result.
Are you referring to my alternate compensation?
If so it's born for the RevC and, according to Siva, LF01 works very well with it.
I'm not sure I understood what are you referrring to... BTW I suggest you to try a mod at a time, otherwise it would be difficult to discern which does what.... 😉
Hey Dario,
These are the parts I received from Siva for C-10, C-32, C-34. Make sense?
These are the parts I received from Siva for C-10, C-32, C-34. Make sense?
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Well, it still needs some work to get as clean and detailed as the Chip amp I have right now. I wish the holes were bigger and more space so that I can use better caps while tuning the power supply.
Where do the Wima caps go? C32?Hey Dario,
These are the parts I received from Siva for C-10, C-32, C-34. Make sense?
I know mica caps were mentioned, and probably at that frequency range mica provides the proper damping? It seems the file caps react differently at the low frequencies.
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soongsc,
C10: 27 pF/500V 2%
C32: 330 pF/630V Wima
C34: 100 pF/50V 5%
Also, when you say it still needs to get cleaner - what are you comparing it to? Are you referring to specs or sound?
C10: 27 pF/500V 2%
C32: 330 pF/630V Wima
C34: 100 pF/50V 5%
Also, when you say it still needs to get cleaner - what are you comparing it to? Are you referring to specs or sound?
Bob, I did not find C32 330pF a good choice, otherwise, Dario has a different compensation for C10 and C34 which I have also used Wima's I was thinking about using mica. Currently compared against the standard MyRef compensation, I would say they are different, and each is better at different things. Neither is totally better than the other.
I am referring to listening impression comparing with a chip amp I have in an active speaker. Currently the MyRef sounds like what my chip amp sounded like before I changed one series resistor in that active speaker to the Caddock.
I am referring to listening impression comparing with a chip amp I have in an active speaker. Currently the MyRef sounds like what my chip amp sounded like before I changed one series resistor in that active speaker to the Caddock.
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Those caps types and values are for Siva's version of the first version of the alternate compensation.
I've used an all FKP2 config (C10 = 33pF, C32= 330pF, C34=100pf).
I've modified C34 value to 47pF since, as Mauro noted on a private email, 100pF kills the opamp...
Recently I've also dumped C32=330pF going back to 150pF.
Soundstage is bigger with 330pF but I prefer how it sounds with the original value.
The new PS, BTW, reduces a lot the soundstage difference between the two values.
Actually I'm using a full Wima FKP2 config (C10=33pF, C34=47pF)
Thanks guys for a lot of good information. As I'm on the list for the Freeman, I will stick with what I have for now and spend my time finishing the chassis/build of the 1.3s. I have Dario's "Final" BOM if I get the urge.
later.........
later.........
Yes, regiregi22. I hope you can join. Also, I took notes of the 5V PSU you made using C3-C8 to power your LDR. Is that still working out for you ? Could it power a motorized Alps pot ? How much power could one leach from the My_Ref boards before the amp begins to suffer ?
"Also, I took notes of the 5V PSU you made using C3-C8 to power your LDR. Is that still working out for you ? Could it power a motorized Alps pot ? How much power could one leach from the My_Ref boards before the amp begins to suffer ?"
I have often wondered if such an arrangement could be used for the 5V needed on Uriah's Lightspeed.
I have often wondered if such an arrangement could be used for the 5V needed on Uriah's Lightspeed.