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Adafruit Industries, Unique & fun DIY electronics and kits Evil Mad Scientist Labs XL741 Discrete Op-Amp Kit [v2.0] : ID 2086 - The "XL741" Discrete Operational Amplifier kit from Evil Mad Scientist Laboratories is a faithful and functional transistor-scale replica of the μA741 op-amp integrated circuit, the classic and ubiquitous analog workhorse.An Operational Amplifier, or "op-amp" as they are commonly known, is one of the most useful and common types of analog