diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Chip Amps (http://www.diyaudio.com/forums/chip-amps/)
-   -   good and simple preamp for Gainclone (http://www.diyaudio.com/forums/chip-amps/90575-good-simple-preamp-gainclone.html)

Diy martin 18th November 2006 03:48 PM

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
:D

Nuuk 18th November 2006 06:46 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. :att'n:

Diy martin 18th November 2006 08:13 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:D

Nuuk 18th November 2006 08:55 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 11:39 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 11:57 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 12:45 PM

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?
http://myweb.tiscali.co.uk/nuukspot/...retebuffer.gif

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 02:31 PM

yep yep

BWRX 19th November 2006 03:05 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 05:19 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...


All times are GMT. The time now is 01:42 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2