The enlarge sound of article introduction implement, use double result to put integrated circuit, without schism yuan parts of an apparatus, circuit is simple, input and output level all use transformer coupling, in order to achieve efficient goal, suit rustic stage show. Working principle
This enlarge sound implement electric principle is shown like plan institute, input class is Y of the loudhailer that transmit sound, receive the sound of the member that stage is performed, the phonic pen that carries loudhailer is changed into telegraphic date, send transformer T1 primary undertake impedance matchs, send below one class to undertake frequency magnifies by sub output next, before enlarge, insert the passive frequency that comprises by W1 C1 and W2 C2 to compensate a network, its function is divided reduce one part hum besides, all can get certain promotion to tall, bass, class amplifier forms way of BTL result discharge by ICl after, the frequency signal of output is low impedance, input transformer T2 to undertake impedance alternates, sub output is tall impedance, can input end to match with the mike that enlarges aircraft equipment, want only when the job JK. Plug inserts mike socket can. Yuan parts of an apparatus chooses a requirement
Integrated circuit LCl puts circuit for double result, model is TDA2822, biserial is inserted continuously 8 cite a base. Input class passes acoustical loudhailer Y to be able to choose 4 ～ of 5 inches of norms, impedance 8 Ω . W1 and W2 are corrective and alterable resistor, small-sized model seals vertical, norms is 3296 model. Input and output transformer T1 and T2 its circle number comparing all is 1: 10, need to be circled oneself, use E19 silicon steel piece, 200T of enamel-insulated wire of the primary 0.21mm that use Φ ; 2000T of enamel-insulated wire of the sub 0.08mm that use Φ . The resistor capacitance of the others all is groovy data. This are efficient enlarge sound implement after assembling a success, should deserve to go up appropriate plastic housing, its job power source is one 9V of 6V to need outside receive, also can take out from equipment of enlarge sound aircraft. Join the line of the loudhailer that transmit sound can purchase special metal thread from sound box brand shop, screen layer should ground connection, the JK outlet line that output end joins mike inputs place to use should with enlarge machine form a complete set. Two corrective potentiometer of passive network inside machine core W1 and W2, move in proper place, setting lives with Qi Feng, make volume of enlarge sound machine satisfactory till. Need to notice finally: The sound box of the loudhailer that transmit sound and equipment of enlarge sound aircraft does not find a place for in same position, prevent frequency signal to answer be defeated and produce howl to cry, the mesa that inspect play accumulates a loudhailer that transmit sound to be not worth, OK also additional increase again.
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