Simplistic NJFET RIAA - Page 168 - diyAudio
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Old 22nd April 2009, 03:15 PM   #1671
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one channel
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Old 22nd April 2009, 04:16 PM   #1672
Salas is offline Salas  Greece
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Nice symmetric construction.
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Old 22nd April 2009, 05:47 PM   #1673
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TT
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Old 22nd April 2009, 05:50 PM   #1674
RCruz is offline RCruz  Switzerland
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Very nice TT

Can you specify the type of caps in your shunt ?

Ricardo

PS: You MUST do the R6 mod.
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Old 22nd April 2009, 07:07 PM   #1675
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Hi,

what kind of cart are you using?
What schematic are you going to use for the RIAA?

Regards
George
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Old 22nd April 2009, 07:19 PM   #1676
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Ricardo ,
I put silmic, pana FC. and 1000mf Kg that is in my amp

Mod ,as for driver ,one for channell ,bc550 need heatsink and I have only 20 2sj74....I see, If I'm luky with match.....


George
the shunt are for driver stage of my amp
Koetsu black
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Old 23rd April 2009, 06:03 PM   #1677
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Salas Helps !

low battery dmm drive me crazy

match jfet , smtp 12,4v (ok),plus MiniReg is a discrete pin-compatible drop-in substitute for the common 78xx from Greg ,but Ihave some problem ie voltage drop 1v on jfet some time

later with new battery I will tray again

if the problem not solved, better use a zener , or resistor to drop to 9v ,and after jfet stabilized set on variabile smtp, 9v across jfet ???

not lucky with j74 match
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Old 23rd April 2009, 06:42 PM   #1678
Salas is offline Salas  Greece
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I just use a 9V battery, and the DMM in series between NJFETs (GS together) and +, set for mA measurement. Some crocodile clips, no special rig. For PJFETs I just reverse everything.

You can also use 2SK170 wired with GS together, D towards ground, instead of J74 in the negative regulator. See example.
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Old 23rd April 2009, 06:52 PM   #1679
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thanks but the problem is on test idss
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Old 23rd April 2009, 06:55 PM   #1680
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What is the problem exactly?
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