preamp

HOEK · 28th August 2005, 06:27 PM

hallo

I need a schematic of a good preamp
Simple ,discreet parts.
Sugestions?

regards hoek

carlmart · 28th August 2005, 07:28 PM

Have a look here:

http://myweb.tiscali.co.uk/nuukspot/...ainclone2.html

The buffers, IC and discrete, can easily be modified for some gain. Particularly the one with the OPA627.

You can replace that chip, which is rather expensive even if perhaps one of the best there is, with other quality chips.

Carlos

padamiecki · 30th August 2005, 11:50 AM

Quote:

Originally posted by HOEK
hallo

I need a schematic of a good preamp
Simple ,discreet parts.
Sugestions?

regards hoek

Hej
as I am in love in the triplet of the transistors that peufeu has discovered, please try this single ended design.
To minimise "memory distortion" (or as do we wish to call them?) the transistors work at constant power.
The gain is slightly less than 10 times.
The sound is very smooth and detailed.
Please extremely care to use good quaality capacitors.
You can use positive rail up to 30V and negative only -5V as well.
This is the schematic of working circuit.

HOEK · 2nd September 2005, 07:25 PM

Carl Mart

Thanks for your response
There is a lot of information on that site

HOEK · 2nd September 2005, 07:31 PM

Hy Padamiecki

Looks very interesting
I will try this one

thanks

hihopes · 3rd October 2005, 08:41 PM

I have built the 3 bjt discrete buffer this thread refers to (from Decibel Dungeon). I am very happy with it and have made my impression known to DD.
Carlmart says these buffers can easily be configured for some gain. Can he, or anyone else, please explain to me how to do this?
Or maybe it would be better to build a preceding gain stage, or even to build a new pre, configured for gain from the start?

padamiecki · 4th October 2005, 05:40 AM

Quote:

Originally posted by hihopes
I have built the 3 bjt discrete buffer this thread refers to (from Decibel Dungeon).

could you please explain?
because the circuit sent by me in this thread is not a buffer...

hihopes · 4th October 2005, 03:09 PM

Thanks for showing interest. I was referring to the 3 bjt buffer found on Decibel Dungeon's website as referred to by Carlmart. (Found at this address:-http://myweb.tiscali.co.uk/nuukspot/decdun/gainclone2.html)
I have built it with 22uF Black Gate output caps and a different selection of transistors (by trial and listening) and find it simply outstanding.

I would also be very interested indeed to try your design - in fact it looks like the perfect solution for me - but I cannot read the drawing clearly, and also I am not experienced enough to be able to calculate correct values for use with my +/- 16.8V power supply. If you could post a clearer drawing, that would be much appreciated, and any help in how to work out best values would be most welcome.
Thanks,
William.

padamiecki · 5th October 2005, 10:15 AM

Quote:

Originally posted by hihopes
I was referring to the 3 bjt buffer found on Decibel Dungeon's website

my proposition is to try Borbely's buffer

hihopes · 5th October 2005, 11:34 AM

I would like to try peufeu's design, but I am having trouble making out the components at the bottom of the drawing you posted. Is that a trimpot there, and what is the value next to it?

28th August 2005, 06:27 PM	#1
HOEK diyAudio Member Join Date: Apr 2005 Location: Burgum	preamp hallo I need a schematic of a good preamp Simple ,discreet parts. Sugestions? regards hoek

3rd October 2005, 08:41 PM	#6
hihopes diyAudio Member Join Date: Sep 2004 Location: Cape Town	gain from discreste buffer I have built the 3 bjt discrete buffer this thread refers to (from Decibel Dungeon). I am very happy with it and have made my impression known to DD. Carlmart says these buffers can easily be configured for some gain. Can he, or anyone else, please explain to me how to do this? Or maybe it would be better to build a preceding gain stage, or even to build a new pre, configured for gain from the start?

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28th August 2005, 07:28 PM	#2
carlmart diyAudio Member Join Date: Mar 2001 Location: Brazil	Have a look here: http://myweb.tiscali.co.uk/nuukspot/...ainclone2.html The buffers, IC and discrete, can easily be modified for some gain. Particularly the one with the OPA627. You can replace that chip, which is rather expensive even if perhaps one of the best there is, with other quality chips. Carlos

2nd September 2005, 07:25 PM	#4
HOEK diyAudio Member Join Date: Apr 2005 Location: Burgum	Carl Mart Thanks for your response There is a lot of information on that site

2nd September 2005, 07:31 PM	#5
HOEK diyAudio Member Join Date: Apr 2005 Location: Burgum	Hy Padamiecki Looks very interesting I will try this one thanks

4th October 2005, 03:09 PM	#8
hihopes diyAudio Member Join Date: Sep 2004 Location: Cape Town	Thanks for showing interest. I was referring to the 3 bjt buffer found on Decibel Dungeon's website as referred to by Carlmart. (Found at this address:-http://myweb.tiscali.co.uk/nuukspot/decdun/gainclone2.html) I have built it with 22uF Black Gate output caps and a different selection of transistors (by trial and listening) and find it simply outstanding. I would also be very interested indeed to try your design - in fact it looks like the perfect solution for me - but I cannot read the drawing clearly, and also I am not experienced enough to be able to calculate correct values for use with my +/- 16.8V power supply. If you could post a clearer drawing, that would be much appreciated, and any help in how to work out best values would be most welcome. Thanks, William.

5th October 2005, 11:34 AM	#10
hihopes diyAudio Member Join Date: Sep 2004 Location: Cape Town	I would like to try peufeu's design, but I am having trouble making out the components at the bottom of the drawing you posted. Is that a trimpot there, and what is the value next to it?

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