Bedside audio DIY ----- Simple Audio Circuit

The author makes the bedside audio and computer audio number for yourself and friends, usually take two options according to the hand. First, use car accumulators to reform directly. Many owners have removed the original car accommodation machine in order to upgrade the sound system, and most of these setsiers are automatically adjusted or manual tuning liquid crystal display, and some have an external sound source input. The sound quality is still available. Adding power and speakers can be used. The power supply portion does not use a switching power supply because it affects the AM band radio. The author adopts the homemade 50W transformer, the IN5408 full bridge rectification, two 4700uf electrolytic capacitors, one 0.1uf. The CBB capacitive filtering power supply is a power supply. Based on the preferences design the box, put the accommodator and the power supply or even optical drives. The model without external source input can switch from the inner lead external posepoint to the power amplifier input or the converted switch with the original function. Speakers can be self-made or directly using idle old split tab. The second is the full set of circuit homemade. Based on the principle of the simple, it passes multiple assembly tests. According to the speaker power author, the Power amplifier is used to make power amplification, and the NE5532 is low-frequency gain adjustment. Use the full-frequency speaker or the South Whale with a small caliber speaker to do the two-point unit, and the two can be made into active speakers, the circuit is easy to make, and the play is good. If there is an idle and large-scale old split speakers can be directly modified. Fig. 1 is a bass gain adjustment electrogram, Figure 2 is TDA1521 and TDA2616 power amplifier circuit diagrams, and the output power is about 12W, 8W, respectively, when 8Ω load is 20W, respectively. Figure 3 is a typical application diagram of the LM1875 with a power of about 8 Ω15W. When making the power transformer power is not less than 50W, such as the space allows us to be larger as possible, and an abundant power increases in low frequency and analytical force. The TDA series is not a grounded outer coupling capacitor to be more than 1μF. The heat discharge circuit input resistance value can be adjusted when there is a sound blocking and small volume when debugging. Finally, it is worth mentioning that the potentiometer should choose a good quality, otherwise it will have annoying tuning noise. Author: Ma Jie

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