His intent was simply to experiment with LM3886 in the Musical Fidelity topology so 'secondary' aspects as PS are not 'state of the art' but neither neglected.
The zener regulator is pretty simple, economic and has good performance enough for his intent and it's the same used by MF...
The decision to share his design was subsequent.
I do agree.
No, it's not so IMHO, Mauro was upset by all the people that without an even basic understanding of the topology or some measurement/study of the actual circuit started to say things like:
- no shunt bypasses? it's no good,just wait a second that I fix it.
- all elcos must be bypassed, it' a rule o thumb, it's incredible that you don't even thought about it
- Zeners? Can't sound good, this PS is crap
Basically he was upset because people judged, and changed, his design without asking him, or trying to understand, why he made certain choices...
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Mauro did it right the first time. The only "OPTIONAL and SIMPLE" improvement to this design is a parts manufacture swap as Uriah is doing now.
Mauro was mistreated by a few members and was fully justified in leaving. This forum suffers because of it. Sadly I see the same in several threads and all from lesser designers who contribute no original ideas and / or very little constructive information.
Twisted Pair did a professional job of getting permission to offer a kit, and then again stopping sales as a courtesy and respect to Mauro.
Uriah has followed with permission to again offer the kits and PERSONALLY I think this GB of the premium parts is paying homage to Mauro by showing just how good this amp is and how it deserves and keeps company with the BEST parts in the industry.
edit: And I quoted that part of tom's statement in agreement. Sorry if that was not clear.
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It was brief. And brevity often leaves a tremendous amount of room for interpretation.
The only think I would ask him is an explanation about why not doing this change to the PSU. I mean using a regulator. I mean a technical explanation. I really am very curious about why it doesn't give and improvement in this particular circuit.
Why it is not so spreadly using zeners for regulation rather than IC regulators?
Why it is not so spreadly using zeners for regulation rather than IC regulators?
Mauro addressed that in the original thread.
His explanation and the sonic proof was justification enough for me.
It was suggested to me that the schematics should acknowledge Mauro. I have done that. I have also added a few notes summarising the findings/alternatives that have been selected for use in this BoM. New pdfs attached.
I note in the excellent BoM that line 9 mentions "C4, C6" which I think should be "C4, C5", and line 30 mentions "D1, D2,.." which should be "DR1, DR2,.." to match the schematic.
Regards
Geoff
I note in the excellent BoM that line 9 mentions "C4, C6" which I think should be "C4, C5", and line 30 mentions "D1, D2,.." which should be "DR1, DR2,.." to match the schematic.
Regards
Geoff
MyRef_C Ultimate Documentation 1.2
I have just released the last updated documentation file for this group buy project. The main changes are:
-Rearranged main schematic pdf. Now it is more clear to see the nomenclature of each component. Added some comments on the main schematics. Thanks to geoffcooper for the hard work.
-In color and B/W main schematics versions. Some people prefer to see the schematics in black and white. Thanks again to geoffcooper.
-Some minor changes in filenames.
MyRef_C_Ultimate_Documentation_v1.2.rar
I have just released the last updated documentation file for this group buy project. The main changes are:
-Rearranged main schematic pdf. Now it is more clear to see the nomenclature of each component. Added some comments on the main schematics. Thanks to geoffcooper for the hard work.
-In color and B/W main schematics versions. Some people prefer to see the schematics in black and white. Thanks again to geoffcooper.
-Some minor changes in filenames.
MyRef_C_Ultimate_Documentation_v1.2.rar
Around 120. We had 126 when I put up the shop. Some of those guys never ended up buying and some other guys jumped in. I have probably 10 unsold but when we get to building I think more people will join in and purchase. I am just kitting all of the parts up as if they were all sold. Then when the extras sell I already will have them ready to ship.
Hope you all remember your mothers. Mine is visiting.
Uriah
Hope you all remember your mothers. Mine is visiting.
Uriah
Is mother's day today in the states?
Funny thing is that in spain is the first sunday of may, not the second.
Mother's Day - Wikipedia, the free encyclopedia
Sorry for the offtopic.
Funny thing is that in spain is the first sunday of may, not the second.
Mother's Day - Wikipedia, the free encyclopedia
Sorry for the offtopic.
Well, I have just filled with capacitors the remaining little free space of my Lightspeed regulator for MyRef_C. It has mixture of 4 2200uF 6.3v Nichicon and Rubycon, and a 2200uF 16v Chemi-con. They were scavenged from a computer PSU. Adding a total of 11.000uF capacitance at the regulator output.
We'll see if that's enough. I have attached a picture before the caps.
We'll see if that's enough. I have attached a picture before the caps.
Attachments
I will upload the updated doc when it is done.
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