Chipamp as preamp? - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 12th May 2004, 03:27 PM   #21
Join Date: Mar 2003
Location: Lisbon, Portugal
Originally posted by officeboy
Something like Texas Instruments TL072, or On-semi's MC33078, or Nationals LF412 or LMC662?
  Reply With Quote
Old 12th May 2004, 03:31 PM   #22
diyAudio Member
Join Date: Nov 2003
Location: NW Washington
Send a message via MSN to officeboy
Originally posted by carlosfm

Hah, I have no idea, thatís why I'm asking.
I just looked around for what they called low noise, fast op-amps.
ESP recommends FET type op-amps so that's what Iím trying. (Itís just for a sub crossover so not a huge deal)
  Reply With Quote
Old 12th May 2004, 04:03 PM   #23
Join Date: Mar 2003
Location: Lisbon, Portugal
Originally posted by officeboy

(Itís just for a sub crossover so not a huge deal)
Why didn't you say so?
Anything will do, and commercial designs always use the worst they can get (TL072, LM324...).
For peace of mind, and knowing that good op-amps also have better bass , when I made my Sub I used the OPA4228.
Very silent, very good, quad op-amp (or the 2228 for double) and curiously works very well with gains of 1 (buffer), despite of what BB/TI says in the datasheet.
  Reply With Quote
Old 13th May 2004, 02:06 AM   #24
diyAudio Moderator Emeritus
lumanauw's Avatar
Join Date: Oct 2002
Location: Bandung
Send a message via Yahoo to lumanauw
I have done the parallel opamp thing for headphone amps
Please tell me how to parrarel opamps. It has 3 pins, +input, -input, output. Does parrarel several opamps is directly tied these 3pins with each other? Or have to put small value R for every opamp? Got picture?
  Reply With Quote
Old 13th May 2004, 02:32 AM   #25
HDTVman is offline HDTVman  United States
diyAudio Member
Join Date: Aug 2001
Location: Chicago area
I built a small headphone amp for a friend using 2 TLO84s Quad opamps( one for each channel) and a TLO82 dual opamp.

The 84s had all of the + input for each chip tied together with a 100 ohm resistor inseries with the chip. The - input of each opamp was tied to the output of that amp with a 100 ohm resistor. the outputs were all connected together with 10 ohm resistors in series. This give an output current rating of about 70 - 80 ma. The TLO82 was set up as the gain stage driving the TLO84 buffers.

Not the greatest headphone amp in the world but not bad. Real cheap to make and very dependable.

Later BZ
What ever makes the tunes flow
  Reply With Quote


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
preamp for chipamp getafix Chip Amps 1 17th October 2007 10:49 AM
what preamp do you use with your chipamp? jarthel Chip Amps 5 26th June 2007 11:35 PM
chipamp passive preamp / crossover DoomPixie Chip Amps 4 23rd October 2006 09:13 PM
Preamp specs for a chipamp zenon Chip Amps 13 21st May 2006 12:15 AM
chip preamp for my chipamp? Russ White Chip Amps 3 9th March 2005 03:51 PM

New To Site? Need Help?

All times are GMT. The time now is 11:22 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2