BC546 A or B in P3A

DaViruz · 22nd November 2002, 01:22 PM

I'm rebuilding my P3A, and i have both BC546A and BC546B home, which ones should i use? The only difference i can spot is the hFE values, with the B-version being slightly higher (200/450 vs. 110/220).

halojoy · 22nd November 2002, 01:37 PM

And highest beta have 546 C, then B then A
So if you can find 546C, use them
If not 546B will work as good

UrSv · 22nd November 2002, 01:44 PM

And what Rod Elliot prefers we possibly don't know.

I guess that the B version would be preferable as it seems discussions elsewhere seems to suggest that high beta is preferable in diff pairs. I might be wrong though...

/UrSv

Jean · 22nd November 2002, 04:39 PM

I asked Rod similar question, I wanted to use 546b because I run out of A's. He replied "make sure that the input stage especially uses the same type, so as to minimise the voltage differential at the input (for minimum output offset voltage)."

Seems to work just fine with both.

DaViruz · 22nd November 2002, 11:16 PM

Great, i'll go with the B's then.
Here is the PCB i made for it:
http://daviruz.homelinux.org/pics/amp/poweramp.png

Any opinions?

22nd November 2002, 01:22 PM	#1
DaViruz diyAudio Member Join Date: Jun 2002 Location: Sweden	BC546 A or B in P3A I'm rebuilding my P3A, and i have both BC546A and BC546B home, which ones should i use? The only difference i can spot is the hFE values, with the B-version being slightly higher (200/450 vs. 110/220).

22nd November 2002, 01:37 PM	#2
halojoy On Hiatus Join Date: Nov 2002	Nelson prefers high beta. And highest beta have 546 C, then B then A So if you can find 546C, use them If not 546B will work as good

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22nd November 2002, 01:44 PM	#3
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	And what Rod Elliot prefers we possibly don't know. I guess that the B version would be preferable as it seems discussions elsewhere seems to suggest that high beta is preferable in diff pairs. I might be wrong though... /UrSv

22nd November 2002, 04:39 PM	#4
Jean diyAudio Member Join Date: Mar 2002 Location: Sacramento, CA	I asked Rod similar question, I wanted to use 546b because I run out of A's. He replied "make sure that the input stage especially uses the same type, so as to minimise the voltage differential at the input (for minimum output offset voltage)." Seems to work just fine with both.

22nd November 2002, 11:16 PM	#5
DaViruz diyAudio Member Join Date: Jun 2002 Location: Sweden	Great, i'll go with the B's then. Here is the PCB i made for it: http://daviruz.homelinux.org/pics/amp/poweramp.png Any opinions?

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