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Old 28th August 2005, 07:27 PM   #1
HOEK is offline HOEK  Netherlands
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Default preamp

hallo

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


regards hoek
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Old 28th August 2005, 08:28 PM   #2
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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
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Old 30th August 2005, 12:50 PM   #3
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Default Re: preamp

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.
Attached Images
File Type: jpg pre1.jpg (32.3 KB, 1518 views)
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Old 2nd September 2005, 08:25 PM   #4
HOEK is offline HOEK  Netherlands
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Carl Mart

Thanks for your response
There is a lot of information on that site
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Old 2nd September 2005, 08:31 PM   #5
HOEK is offline HOEK  Netherlands
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Hy Padamiecki

Looks very interesting
I will try this one

thanks
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Old 3rd October 2005, 09:41 PM   #6
hihopes is offline hihopes  South Africa
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Default 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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Old 4th October 2005, 06:40 AM   #7
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Default Re: gain from discreste buffer

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...
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Old 4th October 2005, 04:09 PM   #8
hihopes is offline hihopes  South Africa
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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.
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Old 5th October 2005, 11:15 AM   #9
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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
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Old 5th October 2005, 12:34 PM   #10
hihopes is offline hihopes  South Africa
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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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