I found this circuit for conditioning the signal for the PedalShield Uno(Guitar Effect Pedal made using Arduino). I am trying to make a similar project and I copied the circuit but the Op-Amp that I have bought (only one available) is AD8051. The one on the circuit is supposed to be TL972.

I have no understanding of these matters and I would very much appreciate if you can point out the different parts of this circuit and its functionalities. I only know the first part before the op-amp are low-pass filters. I would like to understand this circuit so I can make my own for the AD8051 or if I can avail the TL061.enter image description here


closed as off-topic by Olin Lathrop, Daniel Grillo, Dmitry Grigoryev, Voltage Spike, JYelton Aug 30 '16 at 20:40

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  • \$\begingroup\$ Have you compared the datasheets? \$\endgroup\$ – Roger Rowland Aug 30 '16 at 6:38
  • \$\begingroup\$ I tried but I don't understand a single thing. We are taught only on the software area. \$\endgroup\$ – Warren Gojar Aug 30 '16 at 6:53
  • \$\begingroup\$ Will it work? What is the functionality of a "PedalShield Uno". Don't assume everyone will know this especially the guys who are more senior AND, those guys are the ones more likely to give better detailed answers on op-amps. \$\endgroup\$ – Andy aka Aug 30 '16 at 7:33
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    \$\begingroup\$ This is not about electronic design since you have no interest in understanding the circuit, and only want to know "Can I plug dis inta dat?". We are not here for that. Also, no links to the datasheets. \$\endgroup\$ – Olin Lathrop Aug 30 '16 at 11:10
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    \$\begingroup\$ "We are taught only on the software area" is a weak excuse when you try to design something. If you need to use something you can't fully understand, simply pay for it. \$\endgroup\$ – Dmitry Grigoryev Aug 30 '16 at 15:23

AD8051 is a rail to rail low input current (2uA) Op Amp but uses 10x input bias current than the TL972 and even higher offset current, so is not well suited to this amplifier with unbalanced resistances 1M on (+) and 100K on (-).

This would result in a pop when plugged in from DC offset.

Also the pin numbers are different.

Try to get the right part or use a fine tune range for 2,5V ref if using a 5V supply or V+/2 if not to null the offset , then AC couple the output..


Tony Stewart's answer is correct, but I'll add this. The AD8051 is 100 times faster than the TL972. As a result, since you don't know anything about building this stuff, I'll pretty much guarantee that if you try this it will oscillate at very high (MHz) frequency, get hot, and the audio output will sound crappy.


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