Reverse signal alarm system

专利名称：Reverse signal alarm system发明人：PETERSON; CARL J.申请号：US35016973申请日：19730411公开号：US3905016A公开日：19750909

摘要：An encapsulated self-contained circuit for a reverse alarm to be installed onvehicles and other equipment wherein maximum voltage to power the alarm is limited bya zener diode at 8.5 volts; the circuit is operable to produce adequate decibel strengthfrom the alarm and voltage inputs of less than 75 percent of the maximum voltage aspermitted by the zener diode. Two-flip-flop circuits are connected to conductors fromnegative and positive leads in parallel; the first flip-flop which cycles about once persecond is connected to the second flip-flop which produces 900 - 1200 cycles per secondfrom the emitter of a NPN transistor in the first flip-flop to the base of a like transistorthe second flip-flop which in turn controls the output of the alarm via a power transistorhaving an accurately determined current gain rating, in series with the alarm. A diode inseries with the negative connection to the direct current energy source prevents harm tothe circuit if reverse polarity is accidentally applied.

申请人：PETERSON; CARL J.

更多信息请下载全文后查看