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Old 28th November 2008, 10:32 PM   #361
Salas is offline Salas  Greece
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Hi Lee,

Nice that your components thing is picking up. Wishing you best of progress.

I don't know how it might sound with other regulators. My experience is that my simple one worked straightaway without any problems and sounds fab together with the RIAA. Keeps up with the simple no loop feedback with few FET family components theme at least. Very DIY friendly. Tried and tested. Maybe in the near future you wanna try something more evolved but on the same concept. Just when you feel like chasing some possible additional performance. I would do what wrenchone proposed at page#13, post#314 at that point.
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Old 28th November 2008, 10:42 PM   #362
RCruz is offline RCruz  Switzerland
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Hi Lee

It is very encouraging to hear about your growing bizz

I am convinced this Riaa will be a major improvement over my present setup, so I am willing to wait untill things settle and get functional

Thank you Salas

I agree with you regarding the regs output caps.... I have just replaced the after regs caps on my Meridian 101 with BG FK 470u and the results are incredible....

Ricardo
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Old 28th November 2008, 11:00 PM   #363
Salas is offline Salas  Greece
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Today late, a friend of mine put together on perfboard and tried the Vbe shunt. He called to rave about how well it works with the Riaa. He mentioned that before he finally started listening to it, he got distracted and connected the +V/earth cables from PSU to Riaa the other way around! It stayed as such for a whole minute, pulled down to half the nominal PSU voltage. Guess what. The PSU and Riaa survived that with no injuries. DIY friendly indeed.
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Old 28th November 2008, 11:18 PM   #364
es44 is offline es44  Denmark
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Hmm, i made two Pcb's for the Riaa and the shunt, but it's done in "Diptrace", and i converted them to Pdf.
I have VERY little experience in making Pcb's, so maybe the layout isn't at it's best.
Don't know if it's at any use to You guys, but here they come.
First the component side of the Riaa.
Attached Files
File Type: pdf riaa-top.pdf (32.9 KB, 325 views)
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Old 28th November 2008, 11:20 PM   #365
es44 is offline es44  Denmark
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Next the copper side of the Riaa, mind you it's mirrored for making "direct transfer" easy
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File Type: pdf riaa-bottom-mirror.pdf (36.3 KB, 200 views)
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Old 28th November 2008, 11:21 PM   #366
es44 is offline es44  Denmark
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Then the shunt, component side.
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File Type: pdf psu-top.pdf (31.4 KB, 217 views)
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Old 28th November 2008, 11:23 PM   #367
es44 is offline es44  Denmark
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And last the copper side, mirrored for the shunt reg.
Mirrored too.

Feel free to use them if you want. I haven't done them yet, but hope to get the time to do so.

Best regards
Ebbe
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File Type: pdf psu-bottom-mirror.pdf (28.3 KB, 139 views)
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Old 28th November 2008, 11:38 PM   #368
Salas is offline Salas  Greece
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Nice contribution Ebbe. There are PCB experts here to possibly review them. Are they thoroughly checked out for correct topology?
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Old 28th November 2008, 11:46 PM   #369
Salas is offline Salas  Greece
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I don't see proper space for sinks on the PSU board for one. Also is the Riaa PCB meant for the 36dB MM cascode 1st stage circuit version?
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Old 29th November 2008, 06:54 AM   #370
es44 is offline es44  Denmark
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I'm afraid i goofed up on the PSU. There should be room for a piece af alu on Q1, and a sink on Q4. At least the pieces i have sitting around here.
But... I forgot to make room for C4. I didn't have the footprint for such a big capacitor, so i meant to manually make space for one.
Yes, i should have mentioned, i used the 40dB for Denon 110 & 160.

Seems i better start over again, i did warn you, i'm not too experienced.
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