TDA2030 in-vehicle power amplifier, TDA2030 Power Amplifier
Keywords: TDA2030 Car power amplifier
This article describes a high-quality audio power amplifier structural solution for automobiles, which can be achieved at the lowest cost, and the solution can also be used in a small portable music center. The power amplifier is characterized by a low channel without additional amplifiers, and the speaker of the low frequency channel is connected to the output of the two stereo channels, wherein one signal is inverted, thus constitute a bridge connection circuit, and the case where the low voltage is powered. A sufficient power can be obtained on the compressed low frequency public speaker.
Circuit Principle: The audio power amplifier circuit is shown in the figure, the dual amplifier IC1 LM358 constitutes a front amplifier, and half of it operates in the inverted state in the left channel, and the other half is working in the in-phase state in the right channel, front The magnification of the amplifier is equal to 1, except that the signal is reversed in one of the channels, it also provides a bias voltage of the power amplifier IC2 and IC3 integrated circuit TDA2030. In order to enable the power amplifier output, the DC voltage is slowly increased, and the "Kara" sound generated instantaneously generated in the power supply is eliminated. Introducing the "Kara" sound circuit R6, C5, and power supply in the circuit. When passing, the voltage on the C5 is slowly increased, and the output is not generated "" sound. The diode VD2 is used for the power discharge capacitor C5 fast discharge, and the regulator tube VD1 is used for the DC voltage of the power amplifier output, and thus the fluctuation of the power supply circuit does not affect the quality of the audio play. Another feature of this circuit can operate in a normal single-channel state, such as listening to language programs, in which case the power consumption is reduced, and the lower limit frequency of the amplified signal is improved. At the same time, the speaker BL3 and the filter are disconnected by the switch SA1, and the speakers BL1, BL2 are connected by capacitors C16, C17, and reduce signals below 100 Hz to 150 Hz. BL1, BL2 speakers are also connected by R17, C14, and R18, C15, signals above 300 Hz frequencies. The parameters of the audio power amplifier are as follows: (1) The rated range of the speech frequency (-3db) is 25 to 22000 Hz; (2) The effective power of the stereo channel is 5.5W × 2; (3) The effective power of the low channel is 22W; (4) Rated input voltage 0.25V; (5) The harmonic coefficient is 0.12% in the rated input voltage; (6) voltage amplification coefficient is 26dB; (7) quiescent current 120mA ~ 150mA; (8) The power supply voltage is 11.7 ~ 14.4V. The maximum feature of the audio power amplifier is its turning mode, which is the two relays when the power supply is plus the capacitor C22 and C23 when the power supply is added when the power supply is added to the "K" terminal. Pass, after charging, the relay windings are connected in series through the diode VD3, which can reduce the current flow of the relay winding, improve the temperature status of the power amplifier.
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Component Selection and Installation: Inductive L1 Homemade, using portable radios to output the core of the transformer, with 1.0 mm to 1.2 mm enamel wire through the skeleton. Inductance L2, L3 is a hollow core coil, and a cross section of about 1 mm 2 is 100 turns with a cross section of about 1 mm 2 in a wooden pattern in a diameter of 50 mm. The adjustment of the power amplifier is first determined to determine the quantitative current of the amplifier does not exceed 150 to 200 mA. The relays K1, K2 are not applied, and the contacts K1.1, K2.1 are short-circuited by a short route. When the fuse fu1 is connected, the static current is measured. For the relays K1, K2 plus voltage (removed K1.1, K2.1 short route), turn on the voltage circuit, K1.1, K2.1 contact closed. The switch SA1 is shown in the illustrated position, adds a music signal in the luminous side of the amplifier, and selects the volume R17, R18 to balance the volume between the low frequency and the medium high frequency network. Adjusting R11, R12 can change the amplification factor of the amplifier, and adjusting C5 can change the growth time of the amplifier output DC voltage.
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