diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Analog Line Level (http://www.diyaudio.com/forums/analog-line-level/)
-   -   Tone Control - Volatage range for TL072/LF252-N (http://www.diyaudio.com/forums/analog-line-level/236075-tone-control-volatage-range-tl072-lf252-n.html)

zeebit 16th May 2013 08:20 AM

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?

powerflux 16th May 2013 08:54 AM

Yep, no problem.

zeebit 16th May 2013 09:07 AM

Great. Won't it affect the performance?

Loren42 16th May 2013 10:40 AM

Quote:

Originally Posted by zeebit (Post 3493048)
Great. Won't it affect the performance?

Only if you are trying to amplify the signal close to or beyond 12 Volts.

zeebit 16th May 2013 11:59 AM

One more thing, can the LF353 and LF353-N be used interchangeably?

Mooly 16th May 2013 12:06 PM

Yes :)

zeebit 16th May 2013 12:31 PM

Another question. Sorry for being so naive about this stuff. I guess this is the reason why forums exist.:D

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

Loren42 16th May 2013 12:56 PM

Quote:

Originally Posted by zeebit (Post 3493246)
Another question. Sorry for being so naive about this stuff. I guess this is the reason why forums exist.:D

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.

http://www.mdbq.net/diyaudio/sspre.jpg

zeebit 16th May 2013 01:14 PM

Hmm, I could try that. Regarding the volume and balance controls, will it work if I put it the way as I said above?

Mooly 16th May 2013 01:32 PM

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.


All times are GMT. The time now is 06:41 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