A power amplifier circuit made with TDA2030A + NE5532, TDA2030 Power Amplifier
Keywords: A power amplifier circuit created with TDA2030A + NE5532
A power amplifier circuit made with TDA2030A + NE5532
TDA2030AT is an audio power discharge integrated circuit introduced in the 1990s of the National Semiconductor. It adopts the TO-220 package, less peripheral components, but excellent performance, and has the characteristics of frequency response and fast, from the beginning of the 1990s. Recommended by the vast audio enthusiasts now. The most valuable thing is that the price has dropped from the original ten dollars to the present eight nine yuan, and it is best for money that I don't want to spend too much money and think about fever hidden love amateur production. The most advantage of this IC is that the sound quality of the small power output can be directly listened to the high-end audio, and the average power can be obtained at the standard operating voltage, which is sufficient in general home conditions, the author used Ne5532 Level tone circuit promotes the success of this episode, just like the various e-newspaper evaluation, it has achieved excellent results, unfortunately, such a high integrated circuit is rarely in the commercially available amplifier and multimedia active speakers, although the appearance is The pleasure and delicate and beautiful, but open the shell, it is difficult to find its aramid, but the manufacturer in order to save the cost of those yuan, most of the cheap circuits such as 2030 or other names, due to the Package of TDA2030 As in exactly, instead of it directly, you can get immediate results, but must be genuine. The following is the application of the electromechanical map, just draw a channel, and only one channel is drawn, and the other channel is the same.
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In the past e-newspaper, it is often introduced to the power amplifier integrated circuit to cancel the negative feedback capacitor, plus a DC servo circuit composed of an operational amplifier, so that it becomes a pure DC power discharge circuit, and the truth is true to TDA2030A, and LM3886, etc. In this way, directly cancel the capacitor, actually measure the output with the digital multimeter, found that its zero offset is rare, only a few millivolts, I use such circuits for many years, there is no burning integrated block and speaker incident, Moreover, the integrated circuit has an overheated overcurrent short-circuit protection function, which cancels the lower negative feedback capacitance in the negative feedback circuit, which has become a fixed flow amplification circuit, which greatly broadens the frequency response, and the fact proves, as long as the front stage audio input Capacitor is selected, generally using CBB 1u, or use other fever brands such as WiMA, etc., the post-stage potential is very stable, and cannot be used in general electrolytic capacitors, because there is a small current pass, after enlargement Unstable, you can use the sound quality of the cancellation of the sound quality, especially the high-frequency and bass, which is generally used to make servo circuits generally adopt op amp. In addition, the circuit also adopts a current negative feedback circuit. The circuit is also recommended for many circuits recommended in recent years. Compared to the voltage negative feedback circuit, its gain increases with the increase of the increasing output current, which makes low frequency playback Strengthening, it is necessary to point out that when using this circuit, the power reserve of the power supply has a margin, which is recommended to use 150W of loop. Otherwise, not only does not reach the expected results, but make distortion increase, if your power transformer has little power, it is recommended that you use traditional voltage negative feedback.
Below is the front-rear ranking plate image with two TDA2030ATs and two SIG NE5532 (large s). An op amp is a negative feedback tone, and the other is a linear buffer, and the PCB design is grounded separately from the front and rear ground, a little grounding to better play the excellent performance of the integrated circuit, including power rectification, connection, As long as you access the transformer power cord, you can work.
The capacitive portion is the German red WiMA capacitor, and the NE5532 is authentic SIG production. The power filter electrolysis is Nichicom 25V / 4700UF. The capacity is sufficient, and the TDA2030A is sufficient. It is noted that because I use two 12 volts AC power supply, rectification The voltage after filtering is about 18V, which is sufficient to use 25V to resist, if the voltage of the power supply transformer exceeds 12V, it is recommended to use 35V / 4700UF, the resistance metal film, about the capacitor, here, there is an audio passage Sometimes it is essential but the impact on the sound quality is also a component, so there are many imported fever capacitors such as ELNA, such as the circuit, in this circuit, C2 and C5 selection, especially important (C5 is essential) The capacitance of the audio channel in this power circuit is only C10, which can be said to be a pure DC amplification circuit. So test the U2 output DC voltage is 0.9 V or so, there is no relationship, check the NE5532 information, which is much smaller than its maximum output voltage. The listening evaluation of TDA2030A and NE5532 has a lot in the previous newspapers and magazines, no longer said.
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