Here is a 1200W switching power supply. This power supply is designed with the PM4020A driver module. Note that because of a manufacturer's product! Please don't spread it. Supply hobby friends to make use. Specific devices and transformers can refer to the following circuit and product drawings, the circuit version can be downloaded! Notable issues should be considered when designing the PM4020A drive module should be as close as possible to the four IRFP460.
The PA system of the audio generally refers to the audio audio sound reinforcement system. The audio system can be a system composed of an audio source, a preamplifier, a power amplifier, and a speaker. The sound source in the system is a microphone, which is used to convert the sound signal into an electrical signal. The sound source can also be other sound sources, such as tape players, CD players, MD players, etc.
If the sound source is not a microphone, you can cancel the front end.This system is the simplest system for conferences and requires a microphone. Since the output voltage signal of the microphone is very small, between O.lrnV and tens of millivolts, it is not enough to directly drive the power amplifier. The sensitivity of the power amplifier (rated input) is often specified around 0dB (0.775). The power amplifier transmits the amplified electric power signal to the speaker (usually called a speaker), and the speaker then converts the electric power signal into an acoustic signal and radiates it into the space to complete the sound amplification effect, that is, sound reinforcement.
Audio equipment probably includes amplifiers, peripheral equipment (including limiters, effects, equalizers, exciters, etc.), speakers (speakers, speakers), mixers, sound sources (such as microphones, musical instruments, VCDs, DVDs) display devices and so on. Among them, the speaker is the sound output equipment, speakers, subwoofers, etc., a speaker includes high, low, medium three kinds of speakers, three but not necessarily three
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