Help with TL072 selection

[sbm]

Hi all,

Long time lurker, first time poster! 

So as a one-time hardware designer (controller boards for building automation systems, etc now a good 23 years ago) I have prior experience to electronics, but I really haven't touched it very deeply for almost as long (a little dabbling here and there).

I'm looking at building a pedal based around the TL072.  It's pretty exciting to get into this analog stuff so I looked at Mouser and found the 8-pin DIP.  Now, in all the schematics I have poured over from the Internet, it's sometimes not clear to me WHICH TL072 they are using.  I see that some parts use a voltage offset of either 2mV or 3mV.  Others have a bandwidth of 3MHz vs 4MHz.

Typically which part is used a pedal-based design?

Thanks for helping a new old-timer!

[Ripthorn]

Since we are only dealing with the audio range (and even then usually only part of it) the gain bandwidth factor is typically not crucial.  The voltage offset is also not a big issue.  You can pretty much select any TL072 for these circuits and go.

[maarten]

Hello new old-timer,

I never bothered with these questions (maybe they stem from your digital background?). Bandwith is much larger than you will need for guitar, I suppose. As for offset: you tweak until you're satisfied with the results...

Look for the pedal shoot out at You Tube: they even used a video-opamp if I am correct: obviously the differences between op amps have no major impact on the sound (at least not in the controlled environment in this test). Noise might be an aspect to consider; the TL072 is quite a respectable op amp when it comes to this.

So, just do it and enjoy!
Maarten

[sbm]

Hi guys

Thanks very much.  Yup, I've been outed haven't I? 

I spent most of my time on digital I/O and digital electronics.  The guys next to me comprsied of the small army of analogue guys who had all the other fun of hooking-in the analogue world and I just needed to have them give me digital I/O bit or two to deal with the data.

Thanks again!