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Old 19th March 2008, 12:52 PM   #1
jenks is offline jenks  United Kingdom
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Default which op-amps should I use for manipulating ubalanced audio and why??

I'm simulating a circuit in multisim for the first time. My aim is to build a bass preamp so I have a few designs that require op-amps in order to not only cut but boost the signals harmonic content at certain frequencies.

The problem is that all the designs I've found have a variety of op-amps (1C1a - TL072, U1a, U1b, 1C2b - TL072, BF245, TL072, etc) inside but no reason as to why. And I'm also a little confused as to how to power them. I have an LT1013MJ and an LT1013MJ8 in my circuit atm. I've tried powering them a variety of ways but none seem to work.

So please, any advice on which op-amps to use with unbalanced audio and how to power them would be greatly appreciated!

Thanks - Hywel.
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Old 19th March 2008, 01:05 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
the filters assume that Rs=0 and Zin =infinite impedance.
FET input opamps get closest to this goal.
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regards Andrew T.
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