300W amplifier circuit consisting of STK3152IIIII ----- STK3152 300W Amplifier

300W amplifier circuit consisting of STK3152III, STK3152 300W Amplifier Keywords: 300W amplifier circuit consisting of STK3152IIIII 300W amplifier circuit consisting of STK3152III Tian Kai Pre-magnifying circuit The signal input uses two ways of balancing and imbalance, and the balance input circuit consists of op amp NE5532 and peripheral circuits. The unbalanced input is directly sent to STK3152 III 1 foot and 15 feet, and the signals after the STK3152 III is from 5, 6, 10, respectively. 11 pin output, 2, 14 pins are negative feedback input NF of two channels, respectively. Power circuit Be Power amplification circuit Each channel uses 8 high-power-level high-power tubes for Japan Toshiba production to ensure sufficient current driving capabilities. The amount of power tube can be selected according to actual needs. Figure 8 is shown in Figure 9. Due to the large working current, the rectifier filter portion does not use a printed plate, but is in the form of directly soldering. The power amplifier protection circuit selected the special integrated circuit of the amplifier speaker production produced by Japan NEC, using a single-column 8-legged inserted plastic structure. With boot delay, inhibit DC drift, prevent output overload and shutdown impact and other protective functions. When booting, + 56 ~ 80V is powered by 33kΩ, 39kΩ resistance to 7 foot, but 100μF capacitor is charged until 7 foot is sufficiently high, and 6 feet can make the relay action, the speaker is turned on. This time is the power-on delay time, adjust the capacitance value to make it a moderate delay time. 2 feet are midpot DC potential detecting ends, 4-pin is a shutdown detection end, 1 pin is an overload detection end. Production and debugging Input and voltage amplification are as long as the components quality and data meet the requirements, the photo assembly can be assembled. The final push tube and STK3152III and power tubes should be equipped with a suitable heat sink. The power supply and output part of the final plate and the output part of the copper foil should be hot for 1 mm or more. Adjust 4.7kΩ adjustable resistance allows the final static current to be 80mA. Adjust the 0.1 Ω / 5W sampling resistor in the protection circuit so that the relay operation is advisable when the power is used in normal use. The data of the power transformer is marked on the graph. The technical parameters of this unit are as follows: The maximum output power is 300W (8Ω), the total harmonic distortion is less than 0.03%, the full power frequency response 20 Hz ~ 20kHz 0.05dB, the conversion rate is 14V / ms. The above is the value when the power supply voltage is 80V. If the ± 56V time is 150W (8Ω), the other data is unchanged.

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