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Timer

A timer is a specialized type of clock for measuring time intervals.[1] By function timers can be categorized to two main types. A timer which counts upwards from zero for measuring elapsed time is often called a stopwatch; a device which counts down from a specified time interval is more usually called a timer[1] or a countdown timer. A simple example for this type is an hourglass. By working method timers have two main groups: Hardware and Software timers. Some timers sound an audible indication that the time interval has expired. Time switches, timing mechanisms which activate a switch, are sometimes also called "timers".

Timer

型号	DS	厂牌	批号	数量	地区	采购
NE555N		STM	2012	10	美国	要求报价
NE555N		STM	-	4	美国	要求报价
NE555N		STM	-	29	法国	要求报价
NE555N		STM	-	40	法国	要求报价
NE555N		STM	-	246	德国	要求报价
NE555N		STM	-	3	美国	要求报价
NE555N		STM	-	1	法国	要求报价
NE555N		STM	2005+	1238	加拿大	要求报价
NE555N		STM	-	2	德国	要求报价
NE555N		STM	200930	15	德国	要求报价
NE555N		STM	199423+	78	德国	要求报价
NE555N		STM	2018	50	美国	要求报价

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