CN1076324A

CN1076324A - Slender stereo amplifier

Info

Publication number: CN1076324A
Application number: CN 92101667
Authority: CN
Inventors: 林智文
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-03-10
Filing date: 1992-03-10
Publication date: 1993-09-15

Abstract

The invention provides a kind of stereo power amplifier, with with videocorder, sound source devices such as stereo radio reception coupling, characteristics are narrow high cuboids that its fuselage cover such as thick books are directly put, and respectively there is ventilating opening or the vent passages that makes convection current cooling channel up and down the front plate above and below.Therefore this power amplifier can equally with books be positioned on desktop and the bookshelf with other books together, needn't place separately, thereby save usage space and reduce the environmental requirement of using.Amplifier also can be provided with so that it puts steady supporting bracket, hanging hole, auto shut off circuit etc. in addition.

Description

Slender stereo amplifier

The invention belongs to tone playing equipment, particularly about the new design of power amplifier.

The development of modern electronic technology, make small-sized carry-on videocorder, stereo ceiver, miniature laser phonograph etc. can both provide the sound source of high-quality, by numerous youth are liked, but these all can only be listened to earphone, as playing with audio amplifier, then must be through power amplification, and common amplifier all is flat wide cuboid, has coolant vent on the upper and lower panel, and the amplifier of this shape is wanted special usually and placed separately, can not stack with other article, as above article are put in etc., its placement will account for bigger place, and is inconvenient especially for the young people who has above-mentioned sound source device.

The purpose of this invention is to provide a kind of power amplifier,, particularly can be put on bookshelf or the desktop with books because the new design of its profile can be stacked it with other article.

Technical scheme of the present invention is as follows:

The stereo power amplifier of a kind of and small-sized sound source coupling, comprise casing, power unit and power amplifier circuit, the fuselage cover of power amplifier is different from common flat wide cuboid, and be designed to narrow high cuboid, from the front, its width is narrower, highly higher, width is generally less than 1/2 height, the degree of depth be less than or equal to the height, its height as with books, magazine is approaching, then is similar to the books of directly putting, and respectively there are a ventilating opening or vent passages in the front plate above and below, the arrangement of the heater element of self-contained circuit makes the cold air that is entered by its below ventilating opening or passage cool off these elements effectively as far as possible, and does not have the convection current of bigger resistance overslaugh air, even about the power amplifier fuselage, about, be that various things surround behind, also do not influence the heat radiation of its fuselage.The narrow high design of above-mentioned power amplifier fuselage, stability was relatively poor when it was placed separately, for satisfying needs in this case, can at the bottom of its fuselage, establish rotatable supporting bracket, the time spent is not hidden in the casing of base, half-twist during use, supporting bracket is vertically stretched out to the fuselage both sides, so that power amplifier is steadily placed.For the ease of hanging of power amplifier, can be provided with hanging hole in the both sides of power amplifier fuselage.

Power amplifier of the present invention, because narrow high contour structures and ventilating opening are located on the front plate, it can be stacked with other article, as with books are the same is positioned on bookshelf, the desktop, be particularly suitable for having the numerous young student of above-mentioned small-sized sound source device.

Drawings and Examples of the present invention are described as follows:

Fig. 1 is the profile schematic diagram of stereo power amplifier;

Fig. 2 is an embodiment stereo reproducing system schematic diagram;

Fig. 3 is embodiment power amplifier circuit figure.

Present embodiment is the triple channel stereo power amplifier, so-called three energy roads promptly except left and right sound channels, also are provided with a bass channel, amplify the output bass again, can obtain good stereophonic effect and bass effect with two alt audio amplifiers and a woofer like this.Shown in accompanying drawing 1,2,3, power amplifier 1 fuselage appearance is as thick books, and the front is control board and input interface, by sound source device 4 input audio signals.The back side is output interface and power input plug, and front control board upper and lower has vent passages 5, and there is on-hook 6 the fuselage both sides, fuselage bottom has supporting bracket 7, left and right alt audio amplifier 2 volumes that connected are less, and woofer 3 volumes are bigger, and audio amplifier all adopts loudspeaker tiltedly to put the formula audio amplifier.The power unit of power amplifier comprises transformer 9 and full-wave rectification diode circuit 10, and the output tap 11 of 3 volts, 6 volts and 9 volts is arranged on the transformer, constitutes to supply with the DC power supply accessory power outlet of other sound source devices as power supply.Power amplifier also is provided with auto shut off circuit, this circuit is by diode 15, electric capacity 17, resistance 18, reinforced insulation gate field-effect transistor 19, PNP triode 20 and relay, switch 12,13 constitute, circuit is output as input control with audio frequency, by the switch on the power source for relay control line, diode 15 is located at input and is connected with the grid of field effect transistor 19, the capacitance resistance parallel connection is connected between grid and the ground repeatedly, be provided with between grid and the power supply and start knob 16, the collector connection relay of the drain electrode of field effect transistor 19 and triode 20, and by the switch on the relay control amplifying circuit power line.When pressing start button 16, power supply gives electric capacity 17 chargings, thereby make field effect transistor 19 drain-source utmost point conductings, so transistor collector and emitter conducting, electric current makes switch closure on the amplifying circuit power line through relay, if any audio signal output, then audio signal continues to give electric capacity 17 chargings through diode 15 rectifications, then circuit is kept conducting, if be provided with audio signal output, then electric capacity 17 is when resistance 18 discharge offs, and the drain-source utmost point of reinforced insulation gate field-effect transistor 19 ends, the collector electrode and the emitter of PNP triode 20 end, then do not have electric current through relay, the switch on the power line disconnects, and realizes auto shut off circuit.Under the three-channel situation of present embodiment, woofer does not influence stereophonic effect, stereophonic effect is mainly produced by the alt audio amplifier, therefore, wish to obtain good stereophonic effect in different positions, listen in the time of can being positioned over the other so that work of workbench two by the alt audio amplifier of different groups, one group to be put in bed two other so that listen in bed etc., so present embodiment also can be provided with or the selector switches 21 with the alt audio amplifier of selecting to promote different groups at 2 at 3 on left and right sound channels power amplification output.

Certainly, amplifier of the present invention also can add a receiving circuit, constitutes broadcast receiver.

Claims

1, a kind of stereo power amplifier, comprise fuselage cover, power unit and amplifying circuit, it is characterized in that the narrow high cuboid of its fuselage cover (1) for directly putting as thick books, its width is less than 1/2 height, the degree of depth is less than or equal to height, and respectively there is ventilating opening or the ventilation deferent (5) that makes convection current cooling channel up and down the front plate above and below.

2, power amplifier as claimed in claim 1 is characterized in that at the bottom of the fuselage rotatable supporting bracket (7) being arranged, and behind the half-twist, supporting bracket is vertically stretched out to the fuselage both sides, so that power amplifier is steadily placed.

3, as claim 1,2 power amplifier, it is characterized in that the fuselage side has can be for the hanging hole of hanging up (6).

4, power amplifier as claimed in claim 1, it is characterized in that its power unit is transformer (9) and full-wave rectification diode circuit (10), have 3 volts on the transformer, the output tap (11) of 6 volts and 9 volts constitutes and supplies with the DC power supply accessory power outlet of other sound source devices as power supply.

5, as claim 1,4 power amplifier, it is characterized in that being placed on circuit and be provided with auto shut off circuit, this circuit is by two pipe (15) electric capacity (17) resistance (18), reinforced insulation gate field-effect transistor (19), PNP triode (20) and relay, switch (12,13) constitute, circuit is output as input control with audio frequency, by the switch on the power source for relay control line, diode (15) is located at circuit input end and is connected with the grid of field effect transistor (19), electric capacity (17) resistance (18) is connected in parallel between grid and the ground, be provided with start button (16) between grid and the power supply, the drain electrode of field effect transistor (19) is connected with the base stage of triode (20), the collector connection relay of triode (20), and by the switch on the power source for relay control line.

6, power amplifier as claimed in claim 5 is characterized in that on the left and right sound channels power amplification output, is provided with or 3 selector switches (21) that promote the alt audio amplifier of different groups with selection at 2.