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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 11th August 2018, 01:05 AM   #17211
aive is offline aive  Australia
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Thanks again TB, I know you already answered this in PM, but I wasn’t certain how tight the matching needed to be. I shall do as you say thanks mate
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Old 11th August 2018, 08:29 AM   #17212
aive is offline aive  Australia
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I’m planning on building the 40DB version - and the guide state “Choose Q1 between channels from a 10.5-12.5mA range at 5% IDSS pair tolerance.“

The 369’s I have are up around ~15 mA - should I adjust any resistors from the guide to suit?

Thanks
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Old 13th August 2018, 09:49 PM   #17213
spaceistheplace is offline spaceistheplace
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Simplistic NJFET RIAA
Iím looking for one of Salas FSP. If someone has spare boards, completed unit or what have you feel free to contact me.
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Old 13th August 2018, 10:47 PM   #17214
Tea-Bag is offline Tea-Bag  United States
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Simplistic NJFET RIAA
Quote:
Originally Posted by spaceistheplace View Post
Iím looking for one of Salas FSP. If someone has spare boards, completed unit or what have you feel free to contact me.
I have the board and some parts available.
It is all listed in first post of following thread.

GB for Salas Folded Simplistic Phono PCB

Private message me if you are interested. I do not have/do any built up units.
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Old 16th August 2018, 01:15 PM   #17215
aive is offline aive  Australia
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Quote:
Originally Posted by Salas View Post
Hello, from those three the Nichicon is MKT so skip it, between the two MKP the Kemet 400V looks preferable at 2.2uF for dissipation factor than the Vishay. If you will ever want to subjectively compare an "audio" type MKP the rather moderately priced (as luxury components pricing goes) Mundorf plain vanilla Supreme (SUP8-2,20) should be enough for curiosity's shake vs industrial MKP.
I went and got a pair of Supremes as you suggested! Board stuffing complete, waiting for transformers to finish the PSU then testing time :P
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Old 16th August 2018, 04:59 PM   #17216
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Good luck and let us know. By the way what you got for C3?
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Old 16th August 2018, 06:07 PM   #17217
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Quote:
Originally Posted by aive View Post
I’m planning on building the 40DB version - and the guide state “Choose Q1 between channels from a 10.5-12.5mA range at 5% IDSS pair tolerance.“

The 369’s I have are up around ~15 mA - should I adjust any resistors from the guide to suit?

Thanks
Its either change the 5.6K 1W R13 to 5K (10K//10K 0.5W), or higher than average Rail+ will be likely needed to achieve 3.6V TP1-TP2, maybe circa 37.5V. The second option gives more voltage headroom to the following gain stages which is a good thing, but you may also need higher value R3x in the shunt PSU section if your VR1 max setting does not produce high enough Rail+
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Old 16th August 2018, 10:50 PM   #17218
aive is offline aive  Australia
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Quote:
Originally Posted by Salas View Post
Good luck and let us know. By the way what you got for C3?
I got an MKP1837 100nf. I think this was recommended in the thread.
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Old 16th August 2018, 10:57 PM   #17219
aive is offline aive  Australia
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Quote:
Originally Posted by Salas View Post
Its either change the 5.6K 1W R13 to 5K (10K//10K 0.5W), or higher than average Rail+ will be likely needed to achieve 3.6V TP1-TP2, maybe circa 37.5V. The second option gives more voltage headroom to the following gain stages which is a good thing, but you may also need higher value R3x in the shunt PSU section if your VR1 max setting does not produce high enough Rail+


Thanks Salas Iíll try option 2 with the increased voltage. Thanks.
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Old 18th August 2018, 11:40 PM   #17220
aive is offline aive  Australia
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Progress so far - phono boards cased ready for testing. XLR sockets just because my downstream gear is all balanced and I am too lazy to make a custom cable :P

No case for the PSU yet, size it up after I get the trannies.
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