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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 22nd May 2009, 05:43 AM   #1771
pajonec is offline pajonec  Thailand
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Update my RIAA project satus
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Old 22nd May 2009, 05:43 AM   #1772
pajonec is offline pajonec  Thailand
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It woking 21 V output.
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Old 22nd May 2009, 05:43 AM   #1773
pajonec is offline pajonec  Thailand
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I will update my listen test soon๐๐๐๐
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Old 22nd May 2009, 05:51 AM   #1774
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Nice, compact. What version did you make? Looks like low gain mm or high mc, no buffer. Post or link the particular schematics you used and pcb copper mask for people to use if you like.
Are your sinks enough? How much current did you set on shunts?
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Old 22nd May 2009, 07:07 AM   #1775
pajonec is offline pajonec  Thailand
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RIAA follow impedance matching my MC high as per your suggested , Post # 1584
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Old 22nd May 2009, 07:15 AM   #1776
Salas is offline Salas  Greece
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Good one, now I remember. Sumiko yes? On what arm and TT? Have 100k pot type 27 line in?
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Old 22nd May 2009, 09:40 AM   #1777
pajonec is offline pajonec  Thailand
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Yesh Salas, 27 line preamp I build it long time ago.

and I user original Thorens TD-165 TT with arm. I think about few month my new TT will comming.
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Old 22nd May 2009, 11:59 AM   #1778
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Hi Salas

In my Riaa, the zenner is in a tight space..
Can I use miniature leds for D1 or should I stick to the big round 5mm ones ?

Looking at them, it seems the iside parts are bigger in the bigger leds... but that might be paralax error...

Ricardo

PS:
My TX is encapsulated in a plastic case... I do not know if it has any metal screen inside.

If I rotate it 45, the hum is very pronounced and earthing the shield helps a lot. In the minimum hum position, earthing is not noticeable.
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Old 22nd May 2009, 03:48 PM   #1779
Salas is offline Salas  Greece
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Hi Ricardo,

1. Miniature or even surface mount LEDs are OK.
2. 2X3.9V Zener in series seems to be good as the LEDs.

Now with what you said about the shield, I don't see a paradox anymore. Thanks.
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Old 22nd May 2009, 11:22 PM   #1780
RCruz is offline RCruz  Switzerland
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I am happy I did source some 3.9v zenners along with the small leds. Maybe I will try this first (much easier).

What do you mean by paradox ? (My english has some flaws so please excuse some induced missunderstandings)

Ricardo
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