All BJT balanced line stage

Faber · 5th February 2003, 09:13 AM

Hi all!
I noticed a strange behaviour with the BLS posted on passdiy website. When you feed it with a single ended input, the balancd output it's not equal (in amplitude) on the + and - output. I have read on the forum that this is a know behaviour, but me and a friend of mine were interested in having a BLS that acts also as a balancer/unbalacer.

We have many bjt and so...

What do you think of this?
Bye!

uli · 5th February 2003, 10:29 AM

Hi Fabrizio,
maybe the high input resistor causes this behaviour.
As the generator has an outputimpedance which is fairly lo
compared to that 100K I would ground the unused input.

Uli

eLarson · 5th February 2003, 03:45 PM

Fabrizio,

If you use the current source "tails" as you've shown in your schematic, the outputs should be much, much closer to each other in amplitude.

Erik

Faber · 10th February 2003, 08:38 AM

Thank you all!

mlloyd1 · 10th February 2003, 06:45 PM

I think I'd like some resistance across the base-emitter junctions of the MJE devices.

mlloyd1

5th February 2003, 10:29 AM	#2
uli diyAudio Member Join Date: Dec 2002 Location: Vienna, Austria	shortcut Hi Fabrizio, maybe the high input resistor causes this behaviour. As the generator has an outputimpedance which is fairly lo compared to that 100K I would ground the unused input. Uli __________________ 'Jazz is not dead, it just smells funny' F.Zappa

5th February 2003, 03:45 PM	#3
eLarson diyAudio Member Join Date: Aug 2002 Location: Gaithersburg, MD	Fabrizio, If you use the current source "tails" as you've shown in your schematic, the outputs should be much, much closer to each other in amplitude. Erik __________________ Would a woodchuck bother to chuck MDF?

10th February 2003, 08:38 AM	#4
Faber diyAudio Member Join Date: Jun 2002 Location: East side of Milano	Thank you all! __________________ Fabrizio

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10th February 2003, 06:45 PM	#5
mlloyd1 diyAudio Member Join Date: Feb 2001 Location: illinois	I think I'd like some resistance across the base-emitter junctions of the MJE devices. mlloyd1

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