+/- in and out on the aleph-p 1.7? - diyAudio
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Old 26th June 2007, 03:49 AM   #1
jarthel is offline jarthel  Australia
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Default +/- 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
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Old 26th June 2007, 05:50 AM   #2
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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.
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Old 26th June 2007, 08:21 AM   #3
jarthel is offline jarthel  Australia
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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
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Old 26th June 2007, 09:38 AM   #4
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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.
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Old 27th June 2007, 12:02 AM   #5
jarthel is offline jarthel  Australia
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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.
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Old 27th June 2007, 12:09 AM   #6
Magura is offline Magura  Denmark
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That's right

Magura
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Old 27th June 2007, 12:26 AM   #7
jarthel is offline jarthel  Australia
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Quote:
Originally posted by Magura
That's right

Magura
just to verify: unbalanced operation: both - in/out are grounded?
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Old 27th June 2007, 12:38 AM   #8
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by jarthel
just to verify: unbalanced operation: both - in/out are grounded?

Quote:
Originally posted by Magura
That's right

Magura

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Old 27th June 2007, 02:46 AM   #9
jarthel is offline jarthel  Australia
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thank you very much
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Old 27th June 2007, 06:35 AM   #10
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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!
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