Tone Control - Volatage range for TL072/LF252-N - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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 16th May 2013, 09:20 AM   #1
diyAudio Member
 
Join Date: Apr 2013
Default Tone Control - Volatage range for TL072/LF353-N

Hey folks,

I want to DIY a tone control. I have found a couple of schematics online that use either TL072 or LF353-N op amps. The schematics say that Vs should be +/- 15V. I only have +/-12V on hand. Will this be okay for either op amps?

Last edited by zeebit; 16th May 2013 at 10:17 AM.
  Reply With Quote
Old 16th May 2013, 09:54 AM   #2
diyAudio Member
 
Join Date: Apr 2008
Yep, no problem.
  Reply With Quote
Old 16th May 2013, 10:07 AM   #3
diyAudio Member
 
Join Date: Apr 2013
Great. Won't it affect the performance?
  Reply With Quote
Old 16th May 2013, 11:40 AM   #4
Loren42 is offline Loren42  United States
diyAudio Member
 
Join Date: Sep 2008
Location: "Space Coast" Florida, USA
Quote:
Originally Posted by zeebit View Post
Great. Won't it affect the performance?
Only if you are trying to amplify the signal close to or beyond 12 Volts.
  Reply With Quote
Old 16th May 2013, 12:59 PM   #5
diyAudio Member
 
Join Date: Apr 2013
One more thing, can the LF353 and LF353-N be used interchangeably?
  Reply With Quote
Old 16th May 2013, 01:06 PM   #6
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Yes
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 16th May 2013, 01:31 PM   #7
diyAudio Member
 
Join Date: Apr 2013
Another question. Sorry for being so naive about this stuff. I guess this is the reason why forums exist.

1. Basing on the manufacturer's schematic, if I were to add a potentiometer before the first opamp to serve as volume control, would I need to change anything in the circuit?

2. I will be using 2 of the circuits to make it stereo. Would a potentiometer be ok to be used as a balance for the 2 channels? I would be adding it after the volume potentiometer.

Schematic can be found here: Operational Amplifier (Op Amp) - General Purpose Amplifier - LF353-N - TI.com
  Reply With Quote
Old 16th May 2013, 01:56 PM   #8
Loren42 is offline Loren42  United States
diyAudio Member
 
Join Date: Sep 2008
Location: "Space Coast" Florida, USA
Quote:
Originally Posted by zeebit View Post
Another question. Sorry for being so naive about this stuff. I guess this is the reason why forums exist.

1. Basing on the manufacturer's schematic, if I were to add a potentiometer before the first opamp to serve as volume control, would I need to change anything in the circuit?

2. I will be using 2 of the circuits to make it stereo. Would a potentiometer be ok to be used as a balance for the 2 channels? I would be adding it after the volume potentiometer.

Schematic can be found here: Operational Amplifier (Op Amp) - General Purpose Amplifier - LF353-N - TI.com
Maybe you could check out Rod Elliot's projects. I built a variant of this circuit and it performs exceptionally well.

Rod Elliot's Project 97 Preamp

He provides a complete description of each stage.

You can substitute better Op-Amps than a TL072, such as the OPA2134, but it is critical to address power supply noise by placing ceramic by-pass caps (i.e., .1 uF or .01 uF) as close to the power supply pins of the chip as you can.

You may need to make some other subtle adjustments to tame high-frequency oscillation. For example, I ended up with adding a 20 pF cap (C114) between pins 6 and 7 of U10 to stop a high frequency oscillation in that circuit when using LM4562 chips.

Click the image to open in full size.
  Reply With Quote
Old 16th May 2013, 02:14 PM   #9
diyAudio Member
 
Join Date: Apr 2013
Hmm, I could try that. Regarding the volume and balance controls, will it work if I put it the way as I said above?
  Reply With Quote
Old 16th May 2013, 02:32 PM   #10
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
I would put the volume and balance after the tone control stage. This ensures that any constant noise produced is attenuated and also drives the volume network from a low and defined source impedance.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  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 argonrepublic Solid State 11 13th November 2011 02:32 AM
To tone control or not to... dagerman Tubes / Valves 12 27th June 2011 07:15 AM
Tone control argonrepublic Solid State 0 28th February 2010 01:12 AM
Tone control ckt using TL072 shahraj Multi-Way 2 13th October 2009 05:52 PM
i need preamp schematics w/o tone control or volume control hernanstafe Parts 7 30th January 2008 04:12 AM


New To Site? Need Help?

All times are GMT. The time now is 10:29 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