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Old 23rd December 2012, 09:16 PM   #8881
Salas is offline Salas  Greece
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Quote:
Originally Posted by Doug R View Post
OK,
I am winding up things chassis-wise. Here are a couple of teaser photos. I will post some more in a few days.

First learning experience: I had a bolt through the toroid trafo that touched the chassis. (I've never used a toroid before.) Had a 20 volt difference between circuit ground and safety ground. I'll get a nylon bolt.

Dumb question: where can I hook an indicator LED without messing up the circuits? The resistors I have in the raw PS drop less than a volt.

Thanks. More to come.
Doug
Nice case work. Hook the LED across a rectification filter cap with a protection resistor good for 1mA so it shines mildly. (Vcap-VFled)/R=ILED
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Old 23rd December 2012, 09:27 PM   #8882
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The schematic of the post #8723 is for MC cartridge?
What's the schematic of your shunt regulator SSLV1.1?
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Old 23rd December 2012, 09:31 PM   #8883
Salas is offline Salas  Greece
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Yes its for MC. For the reg look in SSLV1.1 builds and fairy tales thread in power supplies sector.
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Old 24th December 2012, 08:07 AM   #8884
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Hi Salas,
i have see in thread power supplier and i have not foud the schematic of SSLV1.1.
Please, can you post it in this thread SSLV1.1?
Can you post it your best riaa for my shure V15 III, with dedicated shunt regulatore schematic?
Many thanks a Merry Christmas.
Mario
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Old 24th December 2012, 08:15 AM   #8885
massimo is offline massimo  Italy
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Quote:
Originally Posted by DARIO1997 View Post
....i have not foud the schematic of SSLV1.1
Mario, check this doc https://docs.google.com/file/d/0BwkE...nQQ/edit?pli=1
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Old 24th December 2012, 02:56 PM   #8886
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Top stuff Doug !

Seasons Greetings to all NJFET 'ers !!!

Cheers.

Si.
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Old 24th December 2012, 04:19 PM   #8887
Salas is offline Salas  Greece
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Quote:
Originally Posted by DARIO1997 View Post
Hi Salas,
Can you post it your best riaa for my shure V15 III, with dedicated shunt regulatore schematic?
Many thanks a Merry Christmas.
Mario
That's a 3.5mV cartridge so use the HighMC/MM from post #4945 pdf guide with an R2 value of 47R for 41.5dB gain. Folded version in this circuit is not optimal for MM level due to various technical reasons.
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Old 25th December 2012, 11:03 AM   #8888
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Talking Seasons Greetings

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Old 25th December 2012, 12:24 PM   #8889
RCruz is offline RCruz  Switzerland
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Hi Salas

I am now starting to focus on the 48dB build update.

I will convert it into a folded cascode input but would like to keep the riaa untouched because it is so good as is.

The problem is first stage load resistor that in the "normal" version is a 3k3r and in the folded should be 2k2.

One solution would be to increase riaa 47k with a 1k1r but I am not sure....

Can the folded cascode be moded to acomodate a 3k3r load resistor ?

I will use the specified 35v shunt because I have enough headroom.... Mains in Switzerland are more like 230vac than 220vac
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Old 25th December 2012, 02:17 PM   #8890
Salas is offline Salas  Greece
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Certainly better to fix the Riaa bridge resistor value if needed than to unsettle the load resistor. Has impact on the input stage current balance.
Mains around 230VAC here too. Most of the time a bit over even.
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