SIMPLE Aleph Pre-amp,

jleaman · 29th September 2009, 04:38 AM

I haven't been around much, been lurking around still reading lots still, but haven't been keeping up with all the pass projects.

My goal, is to find a simple, Pre-Amp for my aleph mini's simple is key so i can still achieve CLEAN sound, but something louder than the Passive pot im using.

I;m running the Mini smd alephs x 4 in se mode ( rca single ended ) 2 amplifiers per speaker, ( one for tweeter one for mid bass )

I am currently working on new cabinets to house my new Ribbon Tweeters ( thanks Planet10 ) and my davis 6.5" efficient drivers.

I only have one source, my fave cd player.

So, ideas schematics pictures are all welcome.

J'

DougL · 29th September 2009, 02:41 PM

If you plug the CD directly into your power amp is it loud enough? If so, a B1 would help.

If not, I defer the question.

HTH

Doug

Gordy · 29th September 2009, 04:06 PM

Quote:

Originally Posted by DougL

If you plug the CD directly into your power amp is it loud enough? If so, a B1 would help.

If not, I defer the question.

HTH

Doug

If your cd player has enough output you may not even need a B1 (/ buffer). I would simply try a 5K potentiometer first.

jleaman · 30th September 2009, 12:26 AM

Right now i'm using a passive pot for the volume, i do need more maybe 1.5 time gain.

njepitt · 30th September 2009, 12:29 AM

Hi,

If you think the B1 is not sufficient, then you might want to take a look at this thread:

BF862 Preamp

It's high on my list of things I want to make soon....

Cheers

Nigel

njepitt · 30th September 2009, 12:30 AM

Our posts crossed... The preamp in the link I posted has a gain of 2, if I recall correctly.

Nigel

yggdrasil · 30th September 2009, 07:44 AM

Would it be possible to reduce the feedback of your Aleph's?

A simple mod if you enjoy your setup.

juma · 30th September 2009, 05:45 PM

Quote:

Originally Posted by njepitt

Hi,

If you think the B1 is not sufficient, then you might want to take a look at this thread:

BF862 Preamp

It's high on my list of things I want to make soon....

Cheers

Nigel

In the meantime, schematic changed:
http://www.diyaudio.com/forums/pass-labs/146310-bf862-preamp-post1938342.html

DougL · 30th September 2009, 10:03 PM

Quote:

Originally Posted by jleaman

Right now i'm using a passive pot for the volume, i do need more maybe 1.5 time gain.

I suggested removing the passive pot. It may be loading down the CD output. If its loud enough direct connected, a buffer would help, by allowing a higher value pot without loosing HF response or volume.
Try it and let us know.

Doug

jleaman · 30th September 2009, 11:41 PM

Quote:

Originally Posted by DougL

I suggested removing the passive pot. It may be loading down the CD output. If its loud enough direct connected, a buffer would help, by allowing a higher value pot without loosing HF response or volume.
Try it and let us know.

Doug

I tried that long time ago, It defiantly needs more gain,

29th September 2009, 04:38 AM	#1
jleaman Banned Join Date: Apr 2002	SIMPLE Aleph Pre-amp, I haven't been around much, been lurking around still reading lots still, but haven't been keeping up with all the pass projects. My goal, is to find a simple, Pre-Amp for my aleph mini's simple is key so i can still achieve CLEAN sound, but something louder than the Passive pot im using. I;m running the Mini smd alephs x 4 in se mode ( rca single ended ) 2 amplifiers per speaker, ( one for tweeter one for mid bass ) I am currently working on new cabinets to house my new Ribbon Tweeters ( thanks Planet10 ) and my davis 6.5" efficient drivers. I only have one source, my fave cd player. So, ideas schematics pictures are all welcome. J'

29th September 2009, 02:41 PM	#2
DougL diyAudio Member Join Date: Feb 2004 Location: Wheaton IL. Blog Entries: 25	If you plug the CD directly into your power amp is it loud enough? If so, a B1 would help. If not, I defer the question. HTH Doug __________________ Scienta sine ars nihil est - Science without Art is nothing. (Implies the converse as well) Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus

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30th September 2009, 12:26 AM	#4
jleaman Banned Join Date: Apr 2002	Right now i'm using a passive pot for the volume, i do need more maybe 1.5 time gain.

30th September 2009, 12:29 AM	#5
njepitt diyAudio Member Join Date: Aug 2008 Location: Brasilia	Hi, If you think the B1 is not sufficient, then you might want to take a look at this thread: BF862 Preamp It's high on my list of things I want to make soon.... Cheers Nigel

30th September 2009, 12:30 AM	#6
njepitt diyAudio Member Join Date: Aug 2008 Location: Brasilia	Our posts crossed... The preamp in the link I posted has a gain of 2, if I recall correctly. Nigel

30th September 2009, 07:44 AM	#7
yggdrasil diyAudio Member Join Date: Sep 2005	Would it be possible to reduce the feedback of your Aleph's? A simple mod if you enjoy your setup.

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