Need matched dual NPN transistors for I/V stage, quietest JFET for output buffer.

Brian Guralnick · 27th October 2002, 02:15 PM

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

I also wish to buffer the output with a JFET source – 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?

ppl · 27th October 2002, 02:41 PM

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

Fred Dieckmann · 27th October 2002, 02:48 PM

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

mevangel · 27th October 2002, 04:46 PM

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

Marco

Brian Guralnick · 27th October 2002, 05:08 PM

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!

Fred Dieckmann · 27th October 2002, 05:22 PM

that and the fact that the Toshibas will sound better.

Dual Toshiba fets 2SK389 and 2SJ109

But what do I know,
Fred

promitheus · 27th October 2002, 07:51 PM

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.

tschrama · 27th October 2002, 10:30 PM

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.. !)

Brian Guralnick · 28th October 2002, 12:13 PM

My 2 transistor I/V converter has moved to it's own topic, go here:

http://www.diyaudio.com/forums/showt...5401#post75401

ppl · 28th October 2002, 01:08 PM

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

27th October 2002, 02:15 PM	#1
Brian Guralnick diyAudio Member Join Date: Mar 2002 Location: Montreal, Quebec, Canada	Need matched dual NPN transistors for I/V stage, quietest JFET for output buffer. I’m looking for matched dual /or/ pair NPN transistors for the I/V stage on my DAC board. Price is not an issue, what’s the best known available transistor/or/ dual transistors available? I also wish to buffer the output with a JFET source – 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? __________________ _______ Brian

27th October 2002, 02:48 PM	#3
Fred Dieckmann diyAudio Retiree Join Date: Oct 2002 Location: Spain or the pueblo of Los Angeles	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

27th October 2002, 04:46 PM	#4
mevangel diyAudio Member Join Date: Oct 2002 Location: Italy	Schematic? Hi Brian, can you show us the schematic you use for I/V conversion? Marco

27th October 2002, 05:22 PM	#6
Fred Dieckmann diyAudio Retiree Join Date: Oct 2002 Location: Spain or the pueblo of Los Angeles	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

28th October 2002, 12:13 PM	#9
Brian Guralnick diyAudio Member Join Date: Mar 2002 Location: Montreal, Quebec, Canada	My 2 transistor I/V converter has moved to it's own topic, go here: http://www.diyaudio.com/forums/showt...5401#post75401 __________________ _______ Brian


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27th October 2002, 02:41 PM	#2
ppl diyAudio Member Join Date: Apr 2001 Location: Seattle, WA U.S.A.	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

27th October 2002, 07:51 PM	#7
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	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.

27th October 2002, 10:30 PM	#8
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	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.. !)

28th October 2002, 01:08 PM	#10
ppl diyAudio Member Join Date: Apr 2001 Location: Seattle, WA U.S.A.	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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