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DS1302 Clock Module Real-Time Clock Module RTC for Arduino AVR ARM (Batteries not Included)Newegg$1.20
DS1302 Real Time Clock Module by SFT-CK13 for AVR ARM PIC SMD, 3.3V-5V, CR2032 BatteryAmazon$22.00
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Big IC Chip Assortment 200 pcs, opamp, oscillator, pwm, Echo, eq, Timer, Driver LM339, LM393, PC817, 6N137, NE555, DS1302, UC3842AN, UC3843AN, ICL7662, TDA2030, TDA2050, PT2399, VIPER12a, MSGE7Q etc.Amazon