CN86210295U

CN86210295U - Dc electric loudspeaker

Info

Publication number: CN86210295U
Application number: CN 86210295
Authority: CN
Inventors: 黄承昂
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-12-10
Filing date: 1986-12-10
Publication date: 1987-12-23

Abstract

The utility model relates to a DC electric loudspeaker which is suitable for motor vehicles or other places where sounders are needed. The DC electric loudspeaker is mainly composed of a casing, a vibrating diaphragm, an iron core, an energizing coil and an electronic control circuit. The DC electric loudspeaker which omits a relay current interruption contact has the advantages of low cost, silvery and loud sound, no need of debugging, and long service life.

Description

DC electric loudspeaker

The utility model relates to DC horn, especially relates to the DC electronic loudspeaker.

At present, the DC horn of prior art mostly adopts relay outage electric and magnetic oscillation form.But the relay breaker point in the DC horn of this class is easily ablated, is clung, so useful life is short.And must be furnished with the button relay on the loudspeaker external circuit, have at least a contact to need debugging on the loudspeaker, so use inconvenience.

Task of the present utility model is that proposition is a kind of compared with prior art simple in structure, easy to use, is enough to overcome the DC electronic loudspeaker of known technology defective.

DC electronic loudspeaker of the present utility model mainly are made of control circuit and horn bulb, vibrating diaphragm, iron core, magnet exciting coil.The electro coupled oscillator that its control circuit is made up of transistor, according to transistorized conducting with end, be connected the loudspeaker magnet exciting coil in the collector circuit,, make the vibrating diaphragm sounding of loudspeaker with the conducting of circuit with by making the iron core in the magnet exciting coil produce galvanomagnetic effect.Here adopt electronic switching technology, replaced the effect of the electric horn breaker point unit breaker point in the known technology.

DC electronic loudspeaker of the present utility model have the following advantages: cost simple in structure is low, long service life, and audible segment can be made disposable enclosed construction, need not debug.

Solution of the present utility model can further be used description of drawings.

Accompanying drawing 1 is the circuit diagram of DC electronic loudspeaker of the present utility model.

Accompanying drawing 2 is cutaway views of the present utility model.

Followingly with one of optimum implementation the utility model is further described with reference to accompanying drawing.Control circuit part of the present utility model adopts the astable circuit of being made up of two transistors here.After the energized, transistor BG1 ends, the BG2 conducting, capacitor C1(establishes and charges) by the Ce knot of transistor BG2, power supply EC and resistance R 1 are finished discharge.Capacitor C2 is by loudspeaker magnet exciting coil L1 simultaneously, and the ab of power supply EC and transistor BG2 knot is finished charging.To cause the circuit upset like this.The discharge of C1 makes the base potential of transistor BG1 be risen just gradually by negative trend.After arriving certain value, BG1 passes through operating current by by becoming conducting, saturated among the loudspeaker magnet exciting coil L1, and (2) unshakable in one's determination produce a galvanomagnetic effect, inhale moving vibrating diaphragm once.(this is loudspeaker) this moment, the collector potential of transistor BG1 was similar to 0 volt by original becoming by time+12 volt.Since the capacitor two ends to keep just having filled voltage can not suddenly change, so the end that capacitor C2 is connected with the BG2 base stage becomes-12 volts by original 0 volt.So BG2 is become by conducting rapidly to be ended, finishes a feedback procedure.

Through upset, BG1 is conducting, and BG2 is a cut-off state.Capacitor C2 is by Ce knot, power supply EC and the R2 discharge of BG1.C1 is by the eb knot charging of magnet exciting coil L2, power supply EC and the BG1 of another loudspeaker.This will cause the circuit upset again.The discharge of C2 makes transistor BG2 conducting saturated, and BG1 ends.By electric current, magnetization (2) unshakable in one's determination is inhaled moving vibrating diaphragm (1) once among the magnet exciting coil L2 of another loudspeaker, from and finished a positive feedback process that is exceedingly fast.Finished a cycle of oscillation.In a cycle of oscillation of control circuit, the magnet exciting coil L1 of two loudspeaker and each conducting of L2 are once.If change the resistance of resistance R 1 and R2 or change the capacitance of capacitor C1 and C2, cycle of oscillation that just can control circuit, make electric current flows through in the magnet exciting coil number of times about 250 times/second.The vibrating diaphragm of loudspeaker (1) can send clear and melodious sound.Transistor in the circuit can adopt 3DD series.Owing to be operated on off state, so must finned.Diode D1 and D2 be for protective transistor by the time induced potential avoiding producing in the magnetic coil damage establish.

Loudspeaker of the present utility model adopt two forms arranged side by side usually.Two horn structures are identical, and vibrating diaphragm (1) is divided into two-layer up and down, and plane layer is the sounding sheet, joins with shell (4) on every side, and lonely surface layer is a resonance plate, makes sounding louder, change the thickness or the diameter of resonance plate.Just can change its resonance frequency, thereby change the tone of loudspeaker, (2) unshakable in one's determination are divided into two up and down, upper iron core is connected with vibrating diaphragm, following iron core cooperates with magnet exciting coil (3), to be L link to each other with transistor collector in the control circuit magnet exciting coil (3), and shell (4) promptly is the strutting piece of loudspeaker, also is the sympathetic response part of loudspeaker.According to the conducting of electronic control circuit whether.Intermittently there is electric current to pass through in the magnet exciting coil (3), makes iron core (2) produce magnetic.Inhale moving vibrating diaphragm (1).Like this, vibrating diaphragm (1) will send clear and melodious sound along with the operating frequency of electronic control circuit.

Use if want to make single loudspeaker, as long as change the magnet exciting coil L1 among the control circuit figure into one hundreds of ohm resistance.

Claims

1, a kind of DC electronic loudspeaker are made up of control circuit and vibrating diaphragm (1), (2) magnet exciting coil (3) unshakable in one's determination, shell (4), it is characterized in that said control circuit adopts transistor astable circuit technology.

2, according to the said DC electronic loudspeaker of claim 1, it is characterized in that the loudspeaker magnet exciting coil links to each other with transistor collector in the control circuit, with the transistorized conducting in the control circuit and by making the iron core in the loudspeaker magnet exciting coil produce interrupted galvanomagnetic effect, make the vibrating diaphragm sounding.