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Often a simple mechanical bell is used by a customer at a store or hotel lobby, which when activated alerts the personnel that service is requested. The hobby circuit below performs the same function electronically. It also contains a timer circuit, so the service beeper can only be activated once every 30 seconds or so. This prevents some impatient person from ringing multiple times.
Content By http://www.discovercircuits.com/H-Corner/serv-beeper.htm
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