Gainclone Low Pass Filter - Page 2 - 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 13th July 2003, 11:34 AM   #11
diyAudio Member
 
Matttcattt's Avatar
 
Join Date: Feb 2003
Location: Bristol
Quote:
Originally posted by millwood
randy, that's a good suggestion.

Alternatively, you can get the opamp book everyone is talking about from National and it has plenty of examples for active filters.

do you have a link?
__________________
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
  Reply With Quote
Old 13th July 2003, 04:44 PM   #12
diyAudio Member
 
li_gangyi's Avatar
 
Join Date: Jun 2003
Location: Woodlands Circle
So has anyone actually built it and how does it sound?? Could perhaps include the component values...
__________________
Kids in the back seat cause accidents...Accidents in the back seat cause kids...
  Reply With Quote
Old 13th July 2003, 07:15 PM   #13
diyAudio Member
 
purplepeople's Avatar
 
Join Date: Mar 2003
Location: London, Ontario, Canada
Hi mattt,

If you put a 1st order low pass just before the input (one resistor and one cap) I read somewhere that you will drop the signal about 3db or so. If you use a pot with the right range, you could even have a variable cut-off frequency. I prefer dip switches and specific resistor values myself.

If you are willing to live with the extra device, make it active and use a line level opamp (like NE5532, TL0xx, OPA6xx, etc) with a gain of 2 or so to bring the level back to previous. With a 78xx volt reg, you could probably even power it off the GC supply without any significant losses to your GC. Of course, you'd have to open up your amp and add this stuff, but then you would have an "invisible" solution.

I know the GC purists will hate it, but depending on how good your sub driver is, you may not even notice the extra .00x% distortion placed by the extra components.

You also might to add a 5-10Hz high pass (yet 1 more RC) just to keep the DC out of it.

:)ensen
__________________
Those who claim to be making history are often the same ones repeating it.
  Reply With Quote
Old 13th July 2003, 07:36 PM   #14
Account Disabled
 
Join Date: Apr 2003
Location: US
Quote:
Originally posted by Matttcattt



do you have a link?

here is the link:

http://focus.ti.com/docs/apps/catalo...tName=slod006b

if it doesn't work, search for "op amps for everyone" at ti.com.
  Reply With Quote
Old 13th July 2003, 08:33 PM   #15
jleaman is offline jleaman  Belgium
Banned
 
Join Date: Apr 2002
Send a message via AIM to jleaman
Can any one give me some input on this xover that was passed on to me..
Attached Images
File Type: jpg xover1.jpg (91.9 KB, 548 views)
  Reply With Quote
Old 14th July 2003, 12:33 PM   #16
diyAudio Member
 
li_gangyi's Avatar
 
Join Date: Jun 2003
Location: Woodlands Circle
hm...wouyld a 185nF cap work with a 10k resistor for the fist order lowpass filter?? I might want to add a pot to control the frequency...comments?
__________________
Kids in the back seat cause accidents...Accidents in the back seat cause kids...
  Reply With Quote
Old 27th July 2003, 08:56 PM   #17
diyAudio Member
 
Matttcattt's Avatar
 
Join Date: Feb 2003
Location: Bristol
what is the difference between a first and second order crossover? apart from the number of components?
__________________
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
  Reply With Quote
Old 28th July 2003, 02:44 PM   #18
diyAudio Member
 
li_gangyi's Avatar
 
Join Date: Jun 2003
Location: Woodlands Circle
I dunno...but I'm going with an Active filter on Elliot's webby...the ELF one...TI is a bit reluctant to send me samples of the Opamp though...anyone got other sources...or has anyone gotten them?? Thanks...the part No. I am referring to is TL071...
__________________
Kids in the back seat cause accidents...Accidents in the back seat cause kids...
  Reply With Quote
Old 28th July 2003, 04:38 PM   #19
diyAudio Member
 
Matttcattt's Avatar
 
Join Date: Feb 2003
Location: Bristol
Quote:
Originally posted by li_gangyi
I dunno...but I'm going with an Active filter on Elliot's webby...the ELF one...TI is a bit reluctant to send me samples of the Opamp though...anyone got other sources...or has anyone gotten them?? Thanks...the part No. I am referring to is TL071...
reluctant? how do you mean?
__________________
If it aint broke, don't fix it. If it is broke, fix it.
If you can't fix it, take it apart and see how it "worked".
  Reply With Quote
Old 28th July 2003, 05:52 PM   #20
diyAudio Member
 
JOE DIRT®'s Avatar
 
Join Date: Apr 2003
Location: Brantford, ON
TI sent me opa 604 and 627 no problems and they are far superior the TLO 71
a Rep phoned me and asked what application I was using them for and I am being sent literature to help further in the design

DIRT®
  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
Low pass filter? happyb Car Audio 5 11th December 2006 10:47 PM
Low pass filter help ifrythings Subwoofers 1 24th February 2006 10:45 AM
Low Pass filter ThSpeakerDude88 Everything Else 4 8th November 2005 03:53 AM
low pass filter crazyant Car Audio 3 15th September 2005 07:15 PM


New To Site? Need Help?

All times are GMT. The time now is 07:57 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