good and simple preamp for Gainclone

Diy martin · 18th November 2006, 02:48 PM

Hello Diy members,

I am searching for a good and simple preamp for my Gainclones to drive my bass units till 160Hz . I need a gain of 12/16db , this because I use a passive crossover .

All info is welkom

Nuuk · 18th November 2006, 05:46 PM

Do you really mean a pre-amp, or some kind of buffer?

You usually use a pre-amp to control the whole system, not just the woofer!

Anyway, you may find something of use here and on the other GC pages at Decibel Duungeon.

Diy martin · 18th November 2006, 07:13 PM

Hello Nuuk,

You can call it a buffer with gain ?
The 2sk170 pre-amp looks easy to build , have anyone
experience with this amp ??

Thanks for your reply

Nuuk · 18th November 2006, 07:55 PM

I've built them all and they all sound good.

I'm currently using the Pedja Rogic buffer with an attenuator as my preamp!

Nordic · 19th November 2006, 10:39 AM

Nuuk, what is the current demand for that class a transistor buffer of yours... I would love to use it with a preregulator so I could use the amp's 70V supply, but it can only supply about 100ma per rail withthe transistors I have now for the prereg.
I kinda designed PCBs and all without checking if the supply could match the load.

Nuuk · 19th November 2006, 10:57 AM

Quote:

Nuuk, what is the current demand for that class a transistor buffer of yours... I would love to use it with a preregulator so I could use the amp's 70V supply, but it can only supply about 100ma per rail withthe transistors I have now for the prereg.

I have honestly no idea and don't have one set up to measure it at present. Perhaps one of the other builders of this circuit can measure theirs and tell us (MickF?

).

BWRX · 19th November 2006, 11:45 AM

Quote:

Originally posted by Nordic
Nuuk, what is the current demand for that class a transistor buffer of yours.

Do you mean this one on Nuuk's site?

If so, it's pretty easy to determine a rough estimate of the current draw. It's just a simple buffer with constant current source. 0.7V/120ohm is about 6mA and (30V-1.4V)/27kohm is about 1mA. You should be able to run that off of your supply rails provided you change R1 to a value that will keep the current roughly the same.

Nordic · 19th November 2006, 01:31 PM

yep yep

BWRX · 19th November 2006, 02:05 PM

If you are going to use that with +/-70V rails be careful of the power dissipation in Q1 and Q2.

Nordic · 19th November 2006, 04:19 PM

Erm no, the preregulator (from ESP website) will step it down from +/-35V to 24V per rail, after which it gets droped another bit by the actual regulator...

18th November 2006, 02:48 PM	#1
Diy martin diyAudio Member Join Date: Apr 2003 Location: papendrecht	good and simple preamp for Gainclone Hello Diy members, I am searching for a good and simple preamp for my Gainclones to drive my bass units till 160Hz . I need a gain of 12/16db , this because I use a passive crossover . All info is welkom

18th November 2006, 05:46 PM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Do you really mean a pre-amp, or some kind of buffer? You usually use a pre-amp to control the whole system, not just the woofer! Anyway, you may find something of use here and on the other GC pages at Decibel Duungeon. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

18th November 2006, 07:55 PM	#4
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	I've built them all and they all sound good. I'm currently using the Pedja Rogic buffer with an attenuator as my preamp! __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

19th November 2006, 02:05 PM	#9
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	If you are going to use that with +/-70V rails be careful of the power dissipation in Q1 and Q2. __________________ Brian

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18th November 2006, 07:13 PM	#3
Diy martin diyAudio Member Join Date: Apr 2003 Location: papendrecht	Hello Nuuk, You can call it a buffer with gain ? The 2sk170 pre-amp looks easy to build , have anyone experience with this amp ?? Thanks for your reply

19th November 2006, 10:39 AM	#5
Nordic diyAudio Member Join Date: Sep 2005	Nuuk, what is the current demand for that class a transistor buffer of yours... I would love to use it with a preregulator so I could use the amp's 70V supply, but it can only supply about 100ma per rail withthe transistors I have now for the prereg. I kinda designed PCBs and all without checking if the supply could match the load.

19th November 2006, 01:31 PM	#8
Nordic diyAudio Member Join Date: Sep 2005	yep yep

19th November 2006, 04:19 PM	#10
Nordic diyAudio Member Join Date: Sep 2005	Erm no, the preregulator (from ESP website) will step it down from +/-35V to 24V per rail, after which it gets droped another bit by the actual regulator...

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