Chipamp buffer / filter - 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 January 2006, 01:37 PM   #1
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
Default Chipamp buffer / filter

My efforts in revivng the blown yahama sub continues...
Today I completed the amp part and PSU... it played first time... NO HUM yeay...

I want to type this ten times, but I'll just do it in bold....
MAKE SURE YOUR CIRCUIT IS MECHANICALY SOUND...
I can not believe how much more confident I feel in my latest clone... veroboard and all, it should surfive inside the sub without issues... I was so happy to find just the right size wire yesterday for the job, and had 1 small thin piece to go from the input to the SGS... worked like magic...

I have played with making a basic low pass filter using a 741 opamp... yeh it sounds crude, but I just wanted to check that it works etc. (first timer).

My amp is an Inverted GC (ala Nuuk style), so I need a buffer... I got a spare NE5532, which I played with in the week so can someone just confirm that....;

1) I can use one half of the IC for a buffer and the other half for a filter, asif it is 2 ICs?

2) Could you guys please give my proposed circuit a once over...
The goal is just for it to drive a small sub, if I calculated right, it should cut off at 96Hz

Click the image to open in full size.

I'm sure you guys can help me improve it before I waste more veroboard... the day has been going so well, electronicaly speaking!
  Reply With Quote
Old 23rd January 2006, 01:46 AM   #2
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
bump?
  Reply With Quote
Old 23rd January 2006, 02:29 AM   #3
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Looks pefectly alright to me.
7500 Ohm and 220nF gives -3dB cutoff at 96 Hertz.

In these filters if possible, is good to keep those two resistors
between 4.7-10 kOhm in value, and select those caps to set frequency.
Your 7.5k are just right.

If in case you need, you can put in some little gain in first OP.


Nordic, you are not likely to get many replies
when people cant find anything to critic or complain about.
(put in a couple of bad errors in your circuit, and you'll see what I mean)
__________________
lineup
  Reply With Quote
Old 23rd January 2006, 06:10 AM   #4
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
Thanx for the confidence boost... I was about to just put it all together and see if it works....

Opamps are fun... can't believe what I have been missing out on.. If I wan't this old I would go and study electronics...

Will skip on the extra gain for now, as my CD player puts out quite a heavy duty signal it would seem.
  Reply With Quote
Old 23rd January 2006, 10:19 AM   #5
Wynand is offline Wynand  South Africa
diyAudio Member
 
Wynand's Avatar
 
Join Date: Mar 2005
Location: Cape Town
I saw you had the greenies the other day.

That plus your age issue .... wait is that you on your avatar???
  Reply With Quote
Old 23rd January 2006, 12:55 PM   #6
diyAudio Member
 
Join Date: Jul 2004
Location: .
nee die bliksem maak net asof hy so gerook is of so oud is
  Reply With Quote
Old 23rd January 2006, 01:47 PM   #7
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
Seedless, allie pad vannie Kai af my baas.
  Reply With Quote
Old 23rd January 2006, 01:59 PM   #8
Wynand is offline Wynand  South Africa
diyAudio Member
 
Wynand's Avatar
 
Join Date: Mar 2005
Location: Cape Town
En die manne van die kaap sÍ dis duuuuiiiidelik!!!
  Reply With Quote
Old 24th January 2006, 06:33 PM   #9
Nordic is offline Nordic  South Africa
diyAudio Member
 
Nordic's Avatar
 
Join Date: Sep 2005
What would be a good range for resistors to go for 3 x gain?

BTW the circuit works just fine... I just want to counter some of the losses in the Hafler circuit.
  Reply With Quote
Old 24th January 2006, 10:59 PM   #10
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
You may want to download Filter Pro from www.ti.com

With gain of 3:
Attached Images
File Type: png filter pro.png (52.9 KB, 512 views)
  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
valve buffer with chipamp.com lm3886 juluska Chip Amps 0 12th January 2009 10:09 PM
Best buffer for a chipamp? Dxvideo Chip Amps 26 30th June 2008 07:17 AM
OPA627 as a Filter/Buffer? D_GR8_1 Chip Amps 7 10th November 2004 12:17 AM
Op-amps in IV, filter and buffer stages of a DAC Dr.H Digital Source 1 2nd June 2004 03:20 PM
Filter for buffer carlmart Chip Amps 8 1st June 2004 07:57 PM


New To Site? Need Help?

All times are GMT. The time now is 05:55 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