Ask a question: To drive an 8 ohm 10W speaker (the speaker selection has not yet been determined, but at least 6W and above), what can be selected for the selection of the power amplifier chip? Is there a recommended model or reference material? Thank you
There are still some questions:
1. What is the difference between an 8 ohm 10W speaker and a 4 ohm 10W speaker?
2. The so-called rated power of the speaker is 10W. Does it mean that the speaker requires a maximum of 10W or the 10W required for normal operation?
3. If I am driving an 8 ohm 10W speaker, can I only choose the output power greater than 10W when selecting the power amplifier chip?
4. The audio signal is connected to the power amplifier chip. What is the waveform of the audio signal? Sine wave? why?
5. After amplification by the power amplifier chip, does the waveform remain unchanged, but the amplitude of the waveform changes?
Remy Publicado en January 15, 2021
1 Speaker with low impedance, high sensitivity, easy to push, that is, easier to produce sound
2 Rated power, in short, is the maximum output power without damaging the speaker
3 Therefore, a power amplifier smaller than the rated power of the speaker is also possible. Within the rated power range, the greater the output power of the power amplifier, the louder the speaker
4 is an analog signal, a continuously variable signal within a certain range
5 The amplitude becomes larger, the shape does not change, and the shape becomes distorted
Alma Publicado en January 15, 2021
Speakers with small impedance can be powered by a very low power supply voltage, but the current is large, it is necessary to consider the power supply current and the output current of the power amplifier to increase, the power of the general speaker is the maximum power of the instantaneous sine wave, and the continuous withstand power should At about 1/4, the audio signal is very dynamic, the waveform is superimposed on multiple frequency bands, and the actual power consumption is even smaller. If you use a 4 ohm speaker, you can consider a practical car amplifier chip, which can be achieved by a single 12V power supply. 10W power, simple circuit.
Salma Publicado en January 15, 2021
Recommend TDA7297, the peripheral circuit is super simple, Taobao has finished boards for sale, less than 10 yuan, the power can reach 15W
