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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
An LM324 quad opamp or an LM358 dual opamp (same opamps) are designed to work with a single supply as low as 3V. As Ron said, the inputs and outputs (with a load resistor) can swing to ground. Just keep their inputs and outputs below 3.5V. They are a lot better for this application than an old 741 that won't work with only a single 5V supply.
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