A HI-FI active integrated speaker

Active integrated speakers are speakers that combine stereo sound and power supply in one speaker. When the active speaker is connected to another passive speaker, stereo playback can be achieved. It has the advantages of easy use, low system loss, and small footprint. The active speakers introduced in this article are carefully selected from circuit design to speaker and component selection. In order to achieve low investment and good effect, we do not pursue flashy things, but strive to achieve the best coordination of all parts. The cost is only equivalent to a pair of ordinary passive speakers on the market. With the development of electroacoustic technology, it is no longer a difficult task for audio enthusiasts to assemble a pair of HI-FI active speakers by themselves. By assembling by themselves, they have a comprehensive understanding of the overall structure, which is also a special thing. This pair of speakers can be flexibly connected to a variety of sound sources for playback, such as VCD players, CD players, multimedia computers, walkmans, recorders, tape recorders, TVs and karaoke. Use in a room of 15 to 25 square meters. You can get a satisfactory listening effect. Now introduce it to readers.

Circuit principle:

The circuit principle of the preamplifier circuit, power amplifier and power supply is shown in Figure 9-71. Each channel of the preamplifier stage is composed of the king of diode op amps NE5532. The first stage is a common-mode amplifier, which has a very high input impedance and a very low output impedance.