good and simple preamp for Gainclone - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th November 2006, 02:48 PM   #1
diyAudio Member
 
Join Date: Apr 2003
Location: papendrecht
Exclamation 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
  Reply With Quote
Old 18th November 2006, 05:46 PM   #2
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
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.
  Reply With Quote
Old 18th November 2006, 07:13 PM   #3
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
  Reply With Quote
Old 18th November 2006, 07:55 PM   #4
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
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.
  Reply With Quote
Old 19th November 2006, 10:39 AM   #5
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
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.
  Reply With Quote
Old 19th November 2006, 10:57 AM   #6
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
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? ).
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 19th November 2006, 11:45 AM   #7
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
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?
Click the image to open in full size.

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.
__________________
Brian
  Reply With Quote
Old 19th November 2006, 01:31 PM   #8
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
yep yep
  Reply With Quote
Old 19th November 2006, 02:05 PM   #9
BWRX is offline BWRX  United States
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
  Reply With Quote
Old 19th November 2006, 04:19 PM   #10
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
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...
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Simple pre-amp for gainclone help req'd. LucasAdamson Chip Amps 31 16th September 2009 11:31 PM
Pass B1 Passive Buffer Preamp. A good and simple option for chipamps?. A Sanchez Chip Amps 5 2nd January 2009 05:34 PM
good simple DAC kit? cowanrg Digital Source 61 9th October 2006 09:32 PM
need good but simple amp sidd_raj2002 Chip Amps 13 1st February 2005 02:35 PM
very simple gainclone questions wrl Chip Amps 4 23rd June 2003 07:01 AM


New To Site? Need Help?

All times are GMT. The time now is 10:18 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