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MUSICAL MEM-O-LERT Disclosure Number: IPCOM000005643D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2001-Oct-23

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John McKee Greg Snowden


A simple modification to existing pager designs will provide a "Musical Mem-0.Lert" feature. The above block diagram shows a typical pager having an NPN transistor output for driving a vibrator motor The NPN collector is connected to the negative supply of the melody generator IC. This IC is of the type used in musical greeting cards. When the pager is in the MEM mode and a page is received the VIB pin goes low. The melody IC then drives the ceramic transducer with the preprogrammed tune for the duration of the alert, usually about 12 seconds, the VIB pin then goes high and the melody IC is turned off.