In Aleph & out Aloia... help

Danyele82 · 29th June 2004, 06:22 PM

How i can connect the input stage of aleph (left) to the output stage of Aloia (right)?
Can i connect the input stage of aleph directly in the input of the aloia power stage?

The bjt of aloia are MJE243-253, MJE15032-15033 and MJL3281-1302 and the mos of aleph are IRF9610!!

Nelson Pass · 29th June 2004, 09:40 PM

You need a voltage gain stage, or at least a level shifter
to translate the inadequate -45V biased output of the input
stage to the power follower. Check out the topologies of the
A75 for some hints in that area - level shifting and/or folded
cascode.

Danyele82 · 30th June 2004, 05:59 AM

And like here?

Nelson Pass · 30th June 2004, 06:15 PM

No, the output coming off R3 of the balanced input stage will
not have enough gain and voltage swing to do a decent job
of driving the output follower stage.

Anybody care to jump in here with an example schematic?

stefanobilliani · 30th June 2004, 07:13 PM

Schematic of folded cascode ... for example :

stefanobilliani · 30th June 2004, 07:30 PM

.

Danyele82 · 1st July 2004, 06:30 AM

Thank's!! Grazie!

Danyele82 · 1st July 2004, 04:42 PM

Quote:

Originally posted by Nelson Pass
Check out the topologies of the
A75 for some hints in that area - level shifting and/or folded
cascode.

How work the A75 in class AB?

Nelson Pass · 1st July 2004, 06:59 PM

Works fine, as long as the bias is healthy - say more than
1 amp.

Danyele82 · 2nd July 2004, 01:54 PM

What is the gain (unbalanced) of A75?

29th June 2004, 06:22 PM	#1
Danyele82 diyAudio Member Join Date: Mar 2004 Location: Como	In Aleph & out Aloia... help How i can connect the input stage of aleph (left) to the output stage of Aloia (right)? Can i connect the input stage of aleph directly in the input of the aloia power stage? The bjt of aloia are MJE243-253, MJE15032-15033 and MJL3281-1302 and the mos of aleph are IRF9610!!

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29th June 2004, 09:40 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	You need a voltage gain stage, or at least a level shifter to translate the inadequate -45V biased output of the input stage to the power follower. Check out the topologies of the A75 for some hints in that area - level shifting and/or folded cascode.

30th June 2004, 05:59 AM	#3
Danyele82 diyAudio Member Join Date: Mar 2004 Location: Como	And like here?

30th June 2004, 06:15 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	No, the output coming off R3 of the balanced input stage will not have enough gain and voltage swing to do a decent job of driving the output follower stage. Anybody care to jump in here with an example schematic?

30th June 2004, 07:13 PM	#5
stefanobilliani diyAudio Member Join Date: Jun 2002 Location: Italy	Schematic of folded cascode ... for example :

1st July 2004, 06:30 AM	#7
Danyele82 diyAudio Member Join Date: Mar 2004 Location: Como	Thank's!! Grazie!

1st July 2004, 06:59 PM	#9
Nelson Pass The one and only Join Date: Mar 2001	Works fine, as long as the bias is healthy - say more than 1 amp.

2nd July 2004, 01:54 PM	#10
Danyele82 diyAudio Member Join Date: Mar 2004 Location: Como	What is the gain (unbalanced) of A75?

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