I am working on an Arduino project that requires me to be able to handle audio input from a 1/4" input jack, and it needs to be powered with just one 9V DC input. Since the Arduino cannot process negative voltages, my input needs to be centered around 2.5V, not 0V. I found the attached schematic on a similar question, but it uses an LM321, and I only have a TL082. I'm new to op amps, so I don't know much about the differences between them, and I'd rather be as cautious as possible with my components. Therefore, my question is:

Will this schematic also work with a TL082 in the place of the LM321, and if not, how else can I achieve a 0-5V audio signal with a singly-powered TL082?


Cited question: Convert an audio signal to 0-5V using single supply op amp

TL082 Datasheet from TI: https://www.ti.com/lit/ds/symlink/tl082-n.pdf

  • \$\begingroup\$ Please provide a link to the manufacturer's datasheet for the op amp you want to use. \$\endgroup\$ – Elliot Alderson Jan 1 at 18:00
  • \$\begingroup\$ @ElliotAlderson Sorry about that; I've updated the question with a link to the datasheet \$\endgroup\$ – TWG Jan 1 at 18:02
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    \$\begingroup\$ The TL082 does not look like a good choice. You need an op amp that is specified with an input and output voltage range that goes all the way to the negative supply voltage. Look for something that is specified to work with a single supply. \$\endgroup\$ – Elliot Alderson Jan 1 at 18:13
  • \$\begingroup\$ The TL082 output will not swing as low as ground. You might get a minimum of 1.5 volts above ground then it will clip. \$\endgroup\$ – Andy aka Jan 1 at 18:17
  • \$\begingroup\$ Thanks for the responses, everyone. From what you're all saying it looks like my best option is to just invest in another op amp. Is the LM321 my best option? \$\endgroup\$ – TWG Jan 1 at 18:43

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