Simplistic NJFET RIAA - Page 670 - diyAudio
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Old 7th August 2011, 08:01 PM   #6691
Salas is offline Salas  Greece
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Quote:
Originally Posted by Cobra2 View Post
Is there a PCB for this riaa anywhere?

Arne K
Not really. There were some in the old pdf guide, but since then some things don't fit anymore.
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Old 7th August 2011, 08:07 PM   #6692
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I burn my fingers everytime I try to grasp a falling hot iron... Iron tends to fall from the workbench everytime I sumble on its wire

PS:
I did not try a ground plane.... I just made 20 or so layouts until I found the best working one. I implemented a "flying" star GND very close to output mosfet Drain.... I also experimented a lot on output caps placement until I got it working allright. Now I am sure I can do it repeatedly with success.
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Old 11th August 2011, 01:22 PM   #6693
RCruz is offline RCruz  Switzerland
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Just for fun, my latest implementation... I used an RIP DENON3300 CDP Case to place the benz riaa.

It uses 15.7nF FT-1 and V12R shunts.

The case is HEAVY... it even has two black plates (just to add weight) that were placed under the CDP PCBs.

Sound is amazing.
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Old 20th August 2011, 04:05 PM   #6694
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Default Sondek / Ittok / DL103R / Audio Technica OCM3

My kids are teenagers now, and it is time to get a decent stereo system up and running. My stuff has been in boxes for a few years, and the only components that I plan on sticking with is my turntable / tonearm. The old integrated amp and speakers go to the kids.

So, I am thinking of this topology:

Linn Sondek/Ittok-->Simplistic NJFET RIAA-->Lightspeed LDR attenuator-->Pass F5 amplifier-->high efficiency speakers to be determined.

I have always wanted to have a moving coil cartridge, but they were kind of snob items back when I was in grad school. Now, they seem quite affordable. So, I am looking at these:

Denon DL103R 0.25 mV 14 Ohm ($379 from Jerry)
Audio Technica OCM3 0.4 mV 12 Ohm ("on sale" for $499" from Jerry)

Since I don't yet own either cartridge, is one to be preferred over the other, with respect to matching with my tonearm and the preamp? Which of these cartridges best meets price/performance?

I found a circuit in this thread (page 266, post 2652) that uses the four 2SK170 JFETs, but I want to make sure that I am on the right track. Is this the right circuit (for me), or is there a better one?

My Sondek and Ittok are stock from 1988. Are they good enough for the cartridges? Do I need to perform any mods?

Also, any other words of caution or encouragement are welcomed. Thanks in advance to anyone that can help with this barrage of questions.

Andy
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Old 20th August 2011, 06:20 PM   #6695
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Hi,
and if I may ask, what is the recommended circuit for the MM(GradoBlack)/HO-MC(BenzSilver) cartridges? I have Salas-RIAA-V1102F0.pdf, is it the way to go?
Thank you
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Old 20th August 2011, 06:26 PM   #6696
Salas is offline Salas  Greece
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Peafarmer:

Surely to fully drive an F5 from this phono output you will need to add a 20dB gain line preamp. The F5 is only 15dB fixed gain. The 103R is a very good value cartridge, Merlin El Mago uses it on LP12 with Ekos I think, maybe he can tell you more. The Ittok with 11.5gr effective mass should be OK for the 103R giving ~9Hz resonance. Keep in mind that we found its standard compliance ~15, mass with mounting hardware ~9.45g, its coils ~19 Ohm each. All by our measurements in this thread. Use 220R load. About that AT cart I don't have any direct experience, no comment. As for what exact circuit to use, let me know your mean average IDSS of the K170BL batch you are going to have in hand when ready to begin and I will specify you the exact circuit and values then. Mean time go find a link in post#1 that leads to an instructions PDF and read it.
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Old 20th August 2011, 06:29 PM   #6697
Salas is offline Salas  Greece
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Quote:
Originally Posted by Milos P. View Post
Hi,
and if I may ask, what is the recommended circuit for the MM(GradoBlack)/HO-MC(BenzSilver) cartridges? I have Salas-RIAA-V1102F0.pdf, is it the way to go?
Thank you
Yes, it has proper circuits for high output MC and MM there. Tells how to fix the HO/MC circuit for MM with just changing one resistor value. You may use a dip switch locally even if you will be exchanging the cartridges often.
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Old 20th August 2011, 06:34 PM   #6698
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Great, thank you. Is it OK to breadboard/P2P circuit (performance wise) or shall I do a PCB for it?
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Old 20th August 2011, 06:42 PM   #6699
Salas is offline Salas  Greece
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Me I use P2P only. So you can imagine the answer.

P.S. Forgot to mention there is a supplementary GB for the SSLV1.1 BIB board for regulators signing up currently in the group buys section if you want to avoid some work or layout headaches on the PSUs side of things. Each breakable board has two positive sections, plus a negative section.
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Old 20th August 2011, 06:50 PM   #6700
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Thanks, I'll do the same than.
Cheers
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