Popular ICs in Electronics – Part 2 covers useful analog, digital, power and interface devices. LM324 and TL072 are popular op-amps for amplification and signal processing. 74HC00 provides NAND gates, while 74HC14 offers Schmitt-trigger inverters for clean digital switching. CD4046 is a PLL IC used for frequency and phase control. 4N25 is a 6-pin optocoupler for electrical isolation. MAX232 interfaces TTL logic with RS-232. ULN2803A drives multiple loads. AMS1117 provides regulated low-voltage power, while MCP3008 converts eight analog inputs into 10-bit digital data.
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