+/- in and out on the aleph-p 1.7?

jarthel · 26th June 2007, 03:49 AM

I have found a schematic of the aleph 1.7 preamp somewhere in the net.

Can someone tell me what is the purpose of the +/- in and out in the schematic?

Thank you very much

Stefanoo · 26th June 2007, 05:50 AM

the + and - are the balanced output, since the preamplifier is made on a balanced topology that you can use also as single ended configuration by shorting the - input of the pre.

For the board, i have designed it and it looks very nice...at least to me...but i still haven't gotten the chance to etch it....i will do it as soon as i'm done with the aleph ax board so that i can make both of them....i think in the next days i'll be done and ready to attemp at the etching of the boards.

jarthel · 26th June 2007, 08:21 AM

Quote:

Originally posted by Stefanoo
the + and - are the balanced output, since the preamplifier is made on a balanced topology that you can use also as single ended configuration by shorting the - input of the pre.

can you please explain what you meant by balance? Does that mean if I used a "balanced" topology, I need to 2 stereo PCBs?

also you have said "single-ended config by shorting the -in". do you mean connecting a wire from -in to ground? also does that mean I will ignoring the -out?

Thank you for the help

Stefanoo · 26th June 2007, 09:38 AM

It depends!
You could have just one board for a balanced topology 2 boards 4 boards.
It depends, how the circuit was layed.

I use 2 bords: one per each chanel.

About single-ended, you connect the - input to ground and i think that your output will be + and - (- as ground) but i'm not super sure about this, better wait for more experienced guys's replies.

jarthel · 27th June 2007, 12:02 AM

Quote:

Originally posted by Stefanoo

About single-ended, you connect the - input to ground and i think that your output will be + and - (- as ground) but i'm not super sure about this, better wait for more experienced guys's replies.

can someone confirm which in/out point must be ground for unbalanced usage?

Thank you.

Magura · 27th June 2007, 12:09 AM

That's right

Magura

jarthel · 27th June 2007, 12:26 AM

Quote:

Originally posted by Magura
That's right

Magura

just to verify: unbalanced operation: both - in/out are grounded?

Zen Mod · 27th June 2007, 12:38 AM

Quote:

Originally posted by jarthel
just to verify: unbalanced operation: both - in/out are grounded?

Quote:

Originally posted by Magura
That's right

Magura

jarthel · 27th June 2007, 02:46 AM

thank you very much

Stefanoo · 27th June 2007, 06:35 AM

The Aleph P is a balanced pre amp and would give you its maximu by using it as a balanced pre.
Therefore, if you want a single ended pre i suggest you to build the L version, just thought!

26th June 2007, 03:49 AM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	+/- in and out on the aleph-p 1.7? I have found a schematic of the aleph 1.7 preamp somewhere in the net. Can someone tell me what is the purpose of the +/- in and out in the schematic? Thank you very much

26th June 2007, 05:50 AM	#2
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	the + and - are the balanced output, since the preamplifier is made on a balanced topology that you can use also as single ended configuration by shorting the - input of the pre. For the board, i have designed it and it looks very nice...at least to me...but i still haven't gotten the chance to etch it....i will do it as soon as i'm done with the aleph ax board so that i can make both of them....i think in the next days i'll be done and ready to attemp at the etching of the boards. __________________ Stefano

26th June 2007, 09:38 AM	#4
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	It depends! You could have just one board for a balanced topology 2 boards 4 boards. It depends, how the circuit was layed. I use 2 bords: one per each chanel. About single-ended, you connect the - input to ground and i think that your output will be + and - (- as ground) but i'm not super sure about this, better wait for more experienced guys's replies. __________________ Stefano

27th June 2007, 12:09 AM	#6
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	That's right Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

27th June 2007, 06:35 AM	#10
Stefanoo diyAudio Member Join Date: Apr 2006 Location: italia - ora USA -WI	The Aleph P is a balanced pre amp and would give you its maximu by using it as a balanced pre. Therefore, if you want a single ended pre i suggest you to build the L version, just thought! __________________ Stefano


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27th June 2007, 02:46 AM	#9
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	thank you very much

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