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Old 12th September 2012, 07:53 PM   #1091
AP2 is offline AP2  Italy
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Originally Posted by OnAudio View Post
I am humbled Nico . This being diy its a great place to meet, make new friends learn, research, share and have fun. You must have come across this Free PCBs

We just have to match our theory to practical implementation. A lot has been said about PCB layout in this thread and any member is free to offer what they think is the best layout for the designs.

AP thanks for sharing with us your amp. As you can see there is a big disjoint between theory and practical implementation. What would you say is the inductance of those interconnect cables, is the amp worse off ? AP also seems fine with film across the big boys. Does the amp display unruly behaviour ? What do the ears hear ?
??..may be you ref to amp that post Tony.
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Old 12th September 2012, 08:06 PM   #1092
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Apologies AP . Thanks Tony for sharing your amp .
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Old 12th September 2012, 08:31 PM   #1093
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Harrison, since all your follower builders are using identical designs your PCB therefor amp design and pcb layout are not variables but constants and thus eliminated from the equation. It is not a test for your amp at all, just what can be concluded regarding multiple caps on power supply. Okay we will have to take power transformer into consideration.

Maybe Tom, Terry, AP, Frank, DF96, Daniel, AndrewT, et all can guide us what to measure and post it here for discussion of what we see and how it relates to the simulations.

So far we are speculating, theorizing and simulating, a few practical measurements would go a long way especially in substantiating some theories since the amps and layouts are identical and I doubt if we will ever have such an opportunity again.

Thanks in advance Harrison and those DIY members in the process of building SYMEF and 1DIFQC who is prepared and willing to contribute to this thread. I stand to be corrected but any findings here will take some guessing out of the power supply design of future amps.
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Last edited by Nico Ras; 12th September 2012 at 08:42 PM.
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Old 12th September 2012, 08:56 PM   #1094
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Ok Nico. Go ahead guys, lets improve the state of the art Just tell it as it is. That way the results will be clean, but be nice
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Old 12th September 2012, 10:37 PM   #1095
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Quote:
Originally Posted by OnAudio View Post
Apologies AP . Thanks Tony for sharing your amp .
thanks, the amp was built in the 80's, it uses computer grade 3inch can type cap with 56000ufd/100vdc caps bypassed with rifa 2.2ufd/250volt stacked film cap....this was my last super leach amp.....

it will interest you to know that the traffo i built for this amp used #16 primary and #13 secondary wires....
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Old 12th September 2012, 10:56 PM   #1096
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Quote:
Originally Posted by AP2 View Post
Hi, thank Tony...nice job. this your drop voltage 13V is familiar for me and reflect my last pic also.
AndrewT: no..i not have rejected linear psu (as concept),infact i have develop ultra fast regulator for it.
i reject unregulated, independant it is smps or linear.
Market push on new solution, then some companies invest in this direction.
at 50Hz i have calculate a hole of energy(min)=8ms.(just for acceptable 5V of drop under load,if we fill this hole of energy)
show me your solution (exclude big inductance for shift phase)
the 13v rails drop was for full power sine wave testing....i suspect that with music, the drop will be smaller since music has less energy demands on the psu in comparison....
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Old 12th September 2012, 11:23 PM   #1097
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Thanks Tony. That was a big film at 2.2ufd you may not have encountered any problems. Just for curiosity what is your current amp ?
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Old 12th September 2012, 11:30 PM   #1098
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Originally Posted by OnAudio View Post
Thanks Tony. That was a big film at 2.2ufd you may not have encountered any problems. Just for curiosity what is your current amp ?
it's an EL34 pp amp.... i am comfortable with both tubes and ss amps....

this super leach amp was well liked by those who heard this amp play....i don't usually tell others what to expect, i just wait for their comments.....and the leach super amp is indeed a winner....i am going to rebuild this 20 year old amp soon...
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Old 12th September 2012, 11:30 PM   #1099
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Nico,
I am one of the people who is building the 1DIFF amplifiers. I must say that what I can already see is that some people will be modifying the board in a myriad of ways. Different biasing settings and changes in output devices are already appearing it seems. I am trying to build as per the original design unless there is a reason to change what is proposed. I am installing standoffs so I could potentially change the output devices without having to De-solder the devices from the board. I have been watching this thread thinking that the final power supply will have a major impact on the final result to the amplifier. If I can make more than one power supply with the simple test that I proposed I will see if I can do that. I am just not one of the people who will build this amplifier in a couple of days and have the answers fast enough I think. Perhaps one of the people who is a consummate DIY builder and designer could answer this question for all of us.

Steven

Last edited by Kindhornman; 12th September 2012 at 11:36 PM.
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Old 13th September 2012, 12:31 AM   #1100
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Thanks Kindhornman. Your input is highly appreciated. WSJ was constructing a regulated supply here Power Amp Test Fixture for the amp. It seems we will have data for all possible power supplies . This will be a lot of data since members hold a total of 60 1DIFFQC boards and 100 SYMEF boards.

Last edited by OnAudio; 13th September 2012 at 12:34 AM.
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