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Major Brands LM324N General Purpose Quad OP Amplifier, -16-32 Volt, 14-Pin, Plastic Dip Tube, 4.57 mm H x 6.35 mm W x 19.3 mm L (Pack of 20): Electronic Component Amplifiers: Amazon.com: Industrial & Scientific
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Amazon.com: Juried Engineering TL084CN TL084 Quad High Slew Rate JFET-Input Operational Amplifier Op-Amp IC Breadboard-Friendly DIP-14 (Pack of 10) : Industrial & Scientific
Major Brands LM324N General Purpose Quad OP Amplifier, -16-32 Volt, 14-Pin, Plastic Dip Tube, 4.57 mm H x 6.35 mm W x 19.3 mm L (Pack of 20): Electronic Component Amplifiers: Amazon.com: Industrial & Scientific
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Amazon.com: DBParts New for 20PCS TL084CN TL084 DIP-14 Quad JFET-Input Op Amp IC : Industrial & Scientific
Juried Engineering LM224N LM224 Quad Industrial-Grade Operational Amplifier Op Amp Breadboard-Friendly IC DIP-14 (Pack of 5): Amazon.com: Industrial & Scientific
Major Brands LM324N General Purpose Quad OP Amplifier, -16-32 Volt, 14-Pin, Plastic Dip Tube, 4.57 mm H x 6.35 mm W x 19.3 mm L (Pack of 20): Electronic Component Amplifiers: Amazon.com: Industrial & Scientific