Production of three-point frequency active speakers ----- TDA2822 P.A.

Keywords: TDA2822, Speaker Circuit Recently, an electronic three-degree source speaker is made, suitable for use in the "bucket". The core of the circuit is composed of four operational LT074 and common two-channel small power integrated block TDA2822M. The A2 and A4 in IC1 form a high-order active filtering element, low pass, two audio channels. A3 is connected to an inverter, from the output of the A2, A3, A4 to obtain a 1-fold audio voltage signal through low noise, and the high beta-value triode Q is mixed, and the emitter output is opposite to the transmitted signal phase. Frequency segment signal. Due to the high design guarantee of the circuit, the lower frequency is about 7.2kHz and 1 kHz, the ratio of three channel output power is 25% (h), 25% (m), 50% (L) ). After many auditions, the two-channel integrated blocks TDA2822M of the upper limit frequency of 120kHz were selected, and the low-limit frequency is amplified, and the low frequency unit is equipped with TDA2822M to be used as a BTL output. The speaker uses a thickness of the thickness of the thickness of the thickness of the thickness of the density plate and the cabinet, and the gold segmentation method is used in the deep use of 225 mm × 150 mm × 195 mm. The box is provided down the hole. The speaker H is a 2-inch paper pot treble, M is a 2.5-inch common paper pot, and L is a foam side 5 inch bass, and three speaker impedances are 8Ω. Use the 12v1a switching power supply. Put the small circuit board in the L speaker, use MP3 as a source audition, high-stroke bright, medium sound smooth, bass powerful. Author: 福 福

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