Premium megaphone production ----- Audio Power Amplifier

Production of high quality megaphones, Audio Power Amplifier Keywords: high quality megaphone production Production of low-cost quality megaphones It is now introduced that the author's low price, high quality of the sound quality is less than 30 yuan, the machine can be used up to 600 people on the square, and the playback effect is quite satisfactory. Fig. 1 is a circuit diagram. This picture is specially increasing the current negative recipient consisting of R4, R5, R6, and C2, which can effectively eliminate distortion caused by the speaker phonograph induction voltage, further increase the sound quality of the unit. Changing R9 can change the working state of this unit, the R9 value increases the output to the working state of the zone, and the R9 value varies small output to the B-class state, 43Ω is a 1-class state. The β value of the 500-type meter of Q5, Q4 is close to the q4, and the β value of Q6, Q7 is close to the β value of Q1, Q2. Q1, Q2, Q5 domestic N5551, Q3, Q4 use N5401, Q6, Q7 with Dawndon Tube D1277 (2 yuan in disassembly). R6, R14, R15 use 5 W porcelain resistors, other container components without special requirements. If the welding is not misused, it will work normally, the output power is 50W, and two sets of two sets of two channels. With two speakers, it is quite satisfactory in the outdoor use. The power supply requires 200 W power. Figure 2 is an AC power source, Figure 3 is DC power supply for use in outdoor use, with 4 12 V 3AH lead-acid batteries, ensures 2 consecutive hours. Figure 4 is a printed platform, the author is a copper plate with a hand-engraved plate, and the tool is scrapped with a scrap sheet, and the copper plate is pressed well, and the hand is uniform, and the break of a strip is coming out.

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