preamping GC - 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 22nd November 2003, 09:57 PM   #1
sith is offline sith  Croatia
diyAudio Member
 
Join Date: Nov 2003
Location: Split
Default preamping GC

Hi folks....

I want to add preamp to GC, but I'm confused about the input pot.
Should I just omit it, or put resistor of same value instead (eg. the 100k pot for the 100k resistor).
Also what about gain, how should I know if it is too much or too little?I would really hate blowing my speakers to smithereens.

Thanx.
  Reply With Quote
Old 23rd November 2003, 06:30 AM   #2
GregGC is offline GregGC  Canada
diyAudio Member
 
Join Date: Oct 2003
Location: Toronto
First, show us the schematic.

The optimum gain of the GC should be between 22 and 30 times.

If the pot in the sch. you are using is in front of the input cap, than you don't realy need a resistor. If there is no input cap at all, than you'd need some kind of resistance to gnd.

The best is to tell us what sch you are using.

Greg
  Reply With Quote
Old 23rd November 2003, 06:49 AM   #3
usekgb is offline usekgb  United States
diyAudio Member
 
usekgb's Avatar
 
Join Date: Feb 2003
Location: Salt Lake City, UT, USA
I just removed the pot from my gainclone when I hooked it up to a pre-amp. It works just fine.

Cheers,
Zach
  Reply With Quote
Old 23rd November 2003, 11:53 AM   #4
sith is offline sith  Croatia
diyAudio Member
 
Join Date: Nov 2003
Location: Split
Greg, of all the people, you should know ;-))))

Of course it would be your ultimate GC or semi ultimate I'm not sure yet...
  Reply With Quote
Old 23rd November 2003, 04:21 PM   #5
GregGC is offline GregGC  Canada
diyAudio Member
 
Join Date: Oct 2003
Location: Toronto
Quote:
Originally posted by sith
Greg, of all the people, you should know ;-))))

Of course it would be your ultimate GC or semi ultimate I'm not sure yet...

Well, if it's the semi-Ultimate, than it already has a 22k to GND from the +in, so you don't need anything else. just remove the pot and connect the in to R1/+in, but keep in mind it's DC coupled, so your pre amp must not have DC on the output.

If you want to experiment for lower DC offset, try R5=6.8K or 10K and R3=220K
Attached Images
File Type: jpg screenshot003.jpg (47.9 KB, 264 views)
  Reply With Quote
Old 23rd November 2003, 08:14 PM   #6
sith is offline sith  Croatia
diyAudio Member
 
Join Date: Nov 2003
Location: Split
Great...
Thnx man!!!
  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



New To Site? Need Help?

All times are GMT. The time now is 08:28 AM.


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