Inside the 74181 ALU chip: die photos and reverse engineering
IC

Inside the 74181 ALU chip: die photos and reverse engineering

A detailed die photos and reverse engineering of the 74181 ALU chip by Ken Shirriff: What’s inside a TTL chip? To find out, I opened up a 74181 ALU chip, took high-resolution die photos, and reverse-engineered the chip.1 Inside I found several types of gates, implemented with...

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DC Motor Direction Controller with tact switches
Motor

DC Motor Direction Controller with tact switches

DC Motor Direction Control project offers direction control using digital logic gates and a DPDT relay. Features Supply input 12 VDC @ 75 mA Power LED DC Motor Direction LED Yellow/Green Relay Output: up to 7 A Onboard tactile switch for direction control Relay based...

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