non-inverted tone control? - 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 29th January 2005, 10:31 AM   #1
otaku is offline otaku  New Zealand
diyAudio Member
 
Join Date: Jan 2004
Location: Christchurch
Default non-inverted tone control?

Hi, diy community people,
I have an old crown preamp based on 70's op-amps and looking at its schematic, noticed one thing strange.
schematic

It uses one single channel op-amp for each channel in non-inverted configuration, and it has tone control feature. As far as my limited experience tells me, I've never seen tone control circuit in this configuration, which amazes me a bit. All circuits I saw had inverted tone control then another inverted unity gain for phase correction..

Perhaps the engineer of this unit wanted to minimize the number of op-amps by non-inverted tone control followed by no 2nd stage. Is it considered a good technique, I wonder?

I'm also feeling this preamp sounds very dry. Basically it has no gain throughout the circuit which makes it sound dull, I suppose? There's a switch I can select 0db and -10db. At 0db, I could hear noticeable noise. Replacing with OPA627 didn't help.

Any suggestion for possible mod and opinions on the circuit design will be truly grateful. Thanks,
  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
Tone control pre-amp digi01 Chip Amps 16 13th June 2011 08:18 AM
i need preamp schematics w/o tone control or volume control hernanstafe Parts 7 30th January 2008 04:12 AM
Tone Control for my GC aditaquil Chip Amps 5 7th January 2005 12:39 AM
TI's Tone control JhonDoe Chip Amps 26 13th July 2004 02:29 AM


New To Site? Need Help?

All times are GMT. The time now is 02:44 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