CN2073611U

CN2073611U - Microphone type alarm

Info

Publication number: CN2073611U
Application number: CN 90213535
Authority: CN
Inventors: 黄兆亚; 陈心平; 覃跃明; 李炎
Original assignee: Kanghong Science & Technology Inst Of Huanggu District Shenyang City
Current assignee: Kanghong Science & Technology Inst Of Huanggu District Shenyang City
Priority date: 1990-07-03
Filing date: 1990-07-03
Publication date: 1991-03-20

Abstract

The utility model provides a microphone type alarm comprising a waveform generating circuit, a power amplification circuit and an MIC. The microphone type alarm is characterized in that the power amplification circuit is composed of two BTL circuits and a, IC2-5. The output ends of the two BTL circuits couple with each other through two capacitances C1, C2 to form an output of one level connecting in parallel. Thereby, two output lines can be saved. Meanwhile, the IC2-5 uses a TDA2003 integrated package. The TDA2003 integrated package needs few periphery elements. Therefore, the volume of the circuit is reduced. The circuit can be arranged into a microphone type box together with an MIC. When the microphone type alarm is used, the necessary operation is to insert the plug into the plug socket of the police car. When the microphone type alarm is not used, the microphone type alarm can prevent rain, prevent thieves and prevent bump. The microphone type alarm has a long service life and can be installed at various police car.

Description

Microphone type alarm

The utility model belongs to a kind of warning horn.

The JBZ12-O2A type warning horn that present police car is used, volume is bigger, and its main cause is: 1, its power discharging integrated block is selected HA1392 for use, and the characteristics of this integrated package are that the peripheral cell that needs is more, and cost is also high simultaneously; 2, power amplification circuit is that two BTL circuit are arranged side by side, output respectively, and therefore, external cord is more, totally seven.Because volume is bigger, so its circuit can only be placed in the special box, separates with MIC, forms JBZ12-O2A type warning horn.According to public security officer's reflection of using this warning horn, there are following two problems in it: 1, because in the golden cup board travelling formula police car, there is not to be this fixing position of warning horn design, therefore it is very inconvenient to install, after installing reluctantly, because less stable is added jolting of car, electronic component loose contact in the warning horn, its life-span is shorter.2, when being installed in this warning horn on the motorcycle police car, the water-resistant performance of motorcycle is poor, and the switch of warning horn is many again, subjects to drench with rain, used half a year after, 90 percent warning horn is scrapped, and need renew.

The microphone type warning horn that provides a kind of volume less is provided the purpose of this utility model, and it can avoid above-mentioned deficiency.

Below in conjunction with accompanying drawing content of the present utility model is described.

Fig. 1 is an electrical schematic diagram of the present utility model.

Fig. 2 is a functional-block diagram of the present utility model.

Fig. 3 is an outward appearance front view of the present utility model.

Fig. 4 is the left view of Fig. 3.

Referring to Fig. 1,2, the utility model is made up of wave generator circuit, function conversion and audio frequency amplifying circuit, power amplification circuit, warning lamp ON-OFF control circuit, MIC, its improvement: the power amplification circuit that is positioned at the output of function conversion and audio frequency amplifying circuit, by two BTL the electric circuit constitutes, the output of two BTL circuit, by two capacitor C 1, C2 coupling, form the parallel output of one-level, finished by IC2-5. IC2-5 selects the TDA2003 integrated package, because the characteristics of TDA2003 are that needed peripheral cell is less, again owing to form the parallel output of one-level, save two output electric wires, reduced to five by original seven, therefore, volume of the present utility model reduces greatly, cost.

Referring to Fig. 3,4 because volume-diminished of the present utility model, therefore electronic circuit together with MIC, in the microphone type box 1 of completely packing into, the formation microphone type alarm. Like this, in use, only need the jack that aviation formula plug 4 inserts on the police car can be used. The time spent does not pull up. Easy for installation, when the motorcycle police car of water-resistant performance difference uses, can exempt from and drench with rain, prolong service life.

The 2nd, selector switch K3, the 3rd, external cord, the 5th, power switch K2, the 6th, button K4, IC1 are police car signal generating circuit integrated packages 9145.

The utility model compared with prior art has that volume is little, cost is low, installs simply, exempts from and drenches with rain advantages such as long service life.

Claims

1, a kind of microphone type warning horn, form by wave generator circuit, function conversion and audio amplifier circuit, power amplification circuit, warning lamp ON-OFF control circuit and MIC etc., it is characterized in that: said power amplification circuit, form by two BTL IC circuit 2-5, the output terminal of these two BTL circuit, by two capacitor C 1, C2 coupling, form one-level output in parallel, IC2-5 selects the TDA-2003 integrated package for use.

2, warning horn according to claim 1 is characterized in that: MIC and electronic circuit are all packed in the microphone type box.