who has the best audio driver

prorms · 27th May 2006, 05:00 PM

who do you think has the best audio driver?

pinkmouse · 27th May 2006, 05:46 PM

What do you mean?

anatech · 27th May 2006, 06:21 PM

Hi seanmacss,
Given you are posting in Solid State, I guess you mean driver transistors?

-Chris

prorms · 27th May 2006, 08:41 PM

just an example schematic

i have the audio drivers circle in red

example bd134 pnp 1.5 amps 80v 12.5 watts
bd139 npn 1.5 amps 80v 12.5 watts
mje15034npn 4amp 350v 50watts
mje15035pnp 4amp 350v 50watts

http://www.onsemi.com/pub/Collateral/BD136-D.PDF
http://www.onsemi.com/pub/Collateral/BD135-D.PDF
http://www.onsemi.com/pub/Collateral/MJE15034-D.PDF

prorms · 27th May 2006, 08:42 PM

i type an mistake
bd139
bd140

anatech · 27th May 2006, 08:58 PM

Hi seanmacss,
My personal favorites are the Toshiba devices they keep discontinuing.

If only the hFE of the On Semi devices weren't 2:1 for the PNP types.

-Chris

AndrewT · 28th May 2006, 11:09 AM

Hi,
I like 2sb649/d669
120Vce0 or 160Vce0(a), 20W, 1.5A, fT 110 to 140MHz, Cob 27pF, hFE 100 to 200 (C) or 160 to 320 (D).

Good performance for Vrail upto +-60V.
Struggles a bit with low impedance loads but does 4ohm and above very well.

and cheap!

AndrewT · 28th May 2006, 11:14 AM

Hi Seanm,
tr3 is the VAS and should be low Cob for drive from LTP.
tr7 is CCS. Not sure what speed you need here, having seen conflicting arguments.

2sc1360 makes a good VAS.

jaycee · 28th May 2006, 03:30 PM

For the schematic and outputs shown I'd just stick with the MJE15034/5 drivers and either BD139/140 or MJE340/350.

re VAS, I was looking at these Fairchild transistors -

http://www.fairchildsemi.com/ds/KS%2FKSC3503.pdf
http://www.fairchildsemi.com/ds/KS%2FKSA1381.pdf

What do you people think? They look like good VAS and predrivers in a triple darlington output stage to me.

AndrewT · 28th May 2006, 04:05 PM

Hi Jaycee,
the fairchild 2sa1381/c3503 have good specs to suit VAS duty.
Try to get E or F grade, matching grades for N & P types.
For high voltage types the specs hold up very well, most lose somewhere in exchange for this level of voltage tolerance.

27th May 2006, 05:00 PM	#1
prorms diyAudio Member Join Date: Nov 2006	who has the best audio driver who do you think has the best audio driver?

27th May 2006, 05:46 PM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	What do you mean? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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27th May 2006, 06:21 PM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi seanmacss, Given you are posting in Solid State, I guess you mean driver transistors? -Chris

27th May 2006, 08:42 PM	#5
prorms diyAudio Member Join Date: Nov 2006	i type an mistake bd139 bd140

27th May 2006, 08:58 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi seanmacss, My personal favorites are the Toshiba devices they keep discontinuing. If only the hFE of the On Semi devices weren't 2:1 for the PNP types. -Chris

28th May 2006, 11:09 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, I like 2sb649/d669 120Vce0 or 160Vce0(a), 20W, 1.5A, fT 110 to 140MHz, Cob 27pF, hFE 100 to 200 (C) or 160 to 320 (D). Good performance for Vrail upto +-60V. Struggles a bit with low impedance loads but does 4ohm and above very well. and cheap!

28th May 2006, 11:14 AM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Seanm, tr3 is the VAS and should be low Cob for drive from LTP. tr7 is CCS. Not sure what speed you need here, having seen conflicting arguments. 2sc1360 makes a good VAS.

28th May 2006, 03:30 PM	#9
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	For the schematic and outputs shown I'd just stick with the MJE15034/5 drivers and either BD139/140 or MJE340/350. re VAS, I was looking at these Fairchild transistors - http://www.fairchildsemi.com/ds/KS%2FKSC3503.pdf http://www.fairchildsemi.com/ds/KS%2FKSA1381.pdf What do you people think? They look like good VAS and predrivers in a triple darlington output stage to me.

28th May 2006, 04:05 PM	#10
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Jaycee, the fairchild 2sa1381/c3503 have good specs to suit VAS duty. Try to get E or F grade, matching grades for N & P types. For high voltage types the specs hold up very well, most lose somewhere in exchange for this level of voltage tolerance.