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A technology of loudspeaker and resistance, which is applied in the direction of educational appliances, electric-operated teaching aids, transducer circuits, etc., can solve the problems of unfavorable popularization and popularization, complex circuit structure, short transmission distance, etc. The effect of simple structure and long transmission distance
Inactive Publication Date: 2015-05-20
四川中时代科技股份有限公司
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However, the amplifiers used for teaching in the prior art have the disadvantages of easy howling, easy distortion of sound quality, short transmission distance, complex circuit structure, many components, and high cost, which is not conducive to popularization and promotion.
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[0009] The present invention will be further described below in conjunction with accompanying drawing:
[0010] Such as figure 1 Shown: the present invention includes a signal input port IN, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8 , the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the first capacitor C1, the second capacitor C2, the third capacitor C3, Fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, double triode A, first beam tetrode B1, second beam tetrode B2, first transformer T1, second transformer T2, rectifier tube C, inductance coil L, fuse FU, switch S, shielding layer E, AC power supply AC and speaker BY, the signal input port IN is connected to the first end of the firs...
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Abstract
The invention discloses an audio power amplifier for teaching. The audio power amplifier comprises a signal input terminal, a first resistor to a fourteenth resistor, a first capacitor to an eighth capacitor, a double triode, a first beam tetrode, a second beam tetrode, a first transformer, a second transformer, a rectifying tube, an inductance coil, a fuse, a switch, a shielding layer, an AC power supply and a loudspeaker. Compared with the prior art, the audio power amplifier has the advantages that the manner of controlling the volume by utilizing the volume of a signal resource directly is adopted, a volume control potentiometer can be arranged additionally according to the individual requirements, usage is facilitated, adjustment is easy, the sound is loud, the fidelity is high, the transmitting distance is long, the throats of teachers are protected, and the class teaching effect is improved; the circuit structure is simple, components are reduced, cost is low, and popularization and promotion can be benefited.
Description
technical field [0001] The invention relates to an electronic teaching equipment, in particular to a teaching amplifier. Background technique [0002] The teaching amplifier refers to the teacher's propaganda tool specially used for classroom teaching and extracurricular activities. Its working principle is: use electronic components such as diodes and capacitors, through a certain combination, to amplify the micro signal to achieve the effect of sound amplification. In addition to being used for teaching, the teaching amplifier can also be used for conference room amplification, and can also be used as a powerful auxiliary equipment for tour guides or people with hearing problems. However, the amplifiers used for teaching in the prior art have the disadvantages of easy howling, easy distortion of sound quality, short transmission distance, complex circuit structure, many components, and high cost, which is not conducive to popularization and promotion. Contents of the in...
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Application Information
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