Need matched dual NPN transistors for I/V stage, quietest JFET for output buffer. - diyAudio
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Old 27th October 2002, 01:15 PM   #1
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Default Need matched dual NPN transistors for I/V stage, quietest JFET for output buffer.

Iím looking for matched dual /or/ pair NPN transistors for the I/V stage on my DAC board. Price is not an issue, whatís the best known available transistor/or/ dual transistors available?

I also wish to buffer the output with a JFET source Ė follower. My guess that the MPF102 might do fine, but, is there a much better choice of JFET? Might I be better off with a class A, or class B emitter-follower circuit?
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Old 27th October 2002, 01:41 PM   #2
ppl is offline ppl  United States
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IMHO Linear Intergrated systems makes some of the best Small sing transistors available. http://www.linearsystems.com/ also Analog devices MAT-02 and MAT-03 are nice Bipolars. Hope this helps
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Old 27th October 2002, 01:48 PM   #3
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Default Matched pairs and fets

2SA1349 and 2SC3381 pairs

2SK170 fet

All Toshiba devices and my fist choices.

All line level circuits (that is, anything but the output stage of a power amplifier) are class A

post-HH
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Old 27th October 2002, 03:46 PM   #4
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Default Schematic?

Hi Brian,
can you show us the schematic you use for I/V conversion?

Marco
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Old 27th October 2002, 04:08 PM   #5
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Quote:
Originally posted by ppl
IMHO Linear Intergrated systems makes some of the best Small sing transistors available. http://www.linearsystems.com/ also Analog devices MAT-02 and MAT-03 are nice Bipolars. Hope this helps
Wow, dual bipolar & dual J-Fet in SO-8 will make a real nice layout. The only problem here is to match 2 of each device, 1 pair for the Left, & other for the right.

Rough draft of my I/V section comming late tonight, maybe even some scope shots using MPSH10s & MPF102s!
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Old 27th October 2002, 04:22 PM   #6
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Default The only problem here

that and the fact that the Toshibas will sound better.

Dual Toshiba fets 2SK389 and 2SJ109


But what do I know,
Fred
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Old 27th October 2002, 06:51 PM   #7
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Do you already have a circuit ready?
I need something for my DAC also.
It would be very nice of you if you could us the schematic.
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Old 27th October 2002, 09:30 PM   #8
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Hi,

Dont want to be irritating, but I could use a nice I/V schematic too, to complete my DAC... (I did search the forum and found some usefull one .. just being curious..)

gr,
Thijs

(Fred... nice to see you back on the forum.. !)
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Old 28th October 2002, 11:13 AM   #9
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My 2 transistor I/V converter has moved to it's own topic, go here:

http://www.diyaudio.com/forums/showt...5401#post75401
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Old 28th October 2002, 12:08 PM   #10
ppl is offline ppl  United States
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Fred Dieckmann> I asm interested in why you would Think the 2Sj109 & 2SK389 would sound Better. I have used Both manuffactures Transistors and while The Toshiba's sound good IMHO I Think the Linear systems transistors are loser noise and lower Ciss. However i am open to your reasons
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