We generally see the power amplifier is actually a power amplifier, that is, the output is current, no voltage, if there is a voltage that would have to protect. Constant voltage power amplifier is special in the long distance transmission of the occasion, such as shopping malls, broadcast, fire control, buildings, schools, etc., the output is voltage signal to the speakers use transformer into promoting the current signal of the horn. In essence, the constant pressure amplifier is more than two transformers, but in fact it has many differences with our AV amplifier or HIFI amplifier,UPrservice manual download site
Below from the perspective of maintenance to explore.UPrservice manual download site
First of all, the pressure amplifier is not as high as the sound quality requirements for the home audio, so it is also not a few channels, all the speakers are connected in a channel, can sound is the main purpose. So magnified portion of a channel, the microphone input is mono, audio input is a dual channel, after the op amp also merged into one channel. It's more conducive to the examination of the problem.. Second point, after the maintenance level of the amplifier circuit, you can put the output transformer before the circuit as a general set of power amplifier to repair,UPrservice manual download site
Most of the brands are complementary push-pull type. Third, maintenance of other auxiliary circuit should pay attention to the ins and outs of clear lines, such as many of the amplifier output grouping, the panel has several level control switch output can be controlled by the relay. Fourth, how to judge the quality of the output transformer, when it is discovered that the amplification circuit is not abnormal, output is not normal can get rid of the inverter output, in fact the inverter output input end with constant current power amplifier output as can be directly connected to the ordinary speakers, if the normal sound, it shows that the inverter output is likely to have burned.UPrservice manual download site
A constant voltage power amplifier of choose and buy, general shopping malls or stores in the decoration of the time need install the amplifier, but a lot of people to cheap, market of domestic cottage purposes, hundreds of pieces of money can buy to do not know these machines is of poor quality, soon is easily broken, and the poor quality of is also a kind of noise. Compared with the well-known brand of west faction, AB, iron triangle, Budweiser, doctor and so on, I in Chongqing Cadillac store maintenance of sound when met a doctor M2150 and quality that look know extraordinary magnanimity. However, the price is expensive units are generally difficult to accept. So we are in shopping malls, supermarkets, retail stores and other places see of constant voltage power amplifier is made is, we say that the ceiling suction a top horn that, these machines are usually cheaper, sound quality in general.

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