Overview of the board
The bass is powerful, and the high notes are not harsh. Using the chip as the new original: the default bass unit for 1 TDA2050-- output peak of 32W, dual channel unit for the 2 TDA2030-- output peak of 18W+18W. TDA2030, LM1875, TDA2050 can be completely interchangeable, if all replaced by TDA2050 or LM1875, please change to a larger heat sink. Power amplifier chip has five pins: positive power supply, negative power supply, forward input, reverse input and output. Chip heat sink and a cathode connected through electric work when the heat dissipation of the chip never and ground short circuit, or immediately burned out. Here is the board wiring diagram, please carefully control wiring.
Left and right channels: TDA2030Ax2, peak power: 18Wx2, the proposed use of 2.5-4 inch, 4-8 Europe 10-30W full frequency horn.
Bass output: TDA2050Ax1, peak power: 32W,, 5-8, 4-8, 30-50W.
Working power: AC double AC9-15V transformer, recommended for use with dual AC12V power over 30W above the transformer.
Output power: DC12V1.5A, power supply for 12V decoding board.
PCB material: FR-4 glass fiber board, thickness: 1.6mm.
PCB size: 135x60mm.
Radiator size: 100x33x37mm (length x width x height).
Potentiometer shaft center distance: 25mm, shaft diameter: 6MM.
PCB mounting hole spacing: x38mm (long) 128mm (wide).
Net weight: 230g.
Convenient decode board input port: the board is provided with a MP3 decoder board audio input hub (specifications 3P-2.0mm) and to decode board power supply of 12V DC regulated power supply output hub 2P-2.0mm. Use the board output 12V power supply to supply the decoding board, the actual wiring when decoding in audio input to GND don\'t pick capable of reducing interference; if the decoding board separate power supply must be connected to GND. This shop has a variety of 12V power supply of lossless audio WAV+MP3 decoding board and decoding board with the amplifier board power supply end of the positive and negative poles corresponding, the wiring is very convenient, the hand can directly plug can be sound, buy the decode board please [click here]. In this shop to buy connection cable decoder board free 3P and 2P, the power amplifier board to buy off oh.
Select the components: all elements of the new, rectifier and filter by two large 3300UF/25V electrolytic capacitor, to the whole circuit to provide adequate low ripple DC power supply, high dynamic output voice still freely retractable, please you don\'t superstitious filter capacitor, the bigger the better, have too much but just the opposite or occupied space, the knowledge on the net a lot of, baidu knew. Low pass pre amplifier circuit choose double the original Texas ne5532 amplifier, audio coupling capacitor selection of original for Philips CBB capacitor, powerful bass elastic. Rectifier circuit selection of the original SEP large 6A rectifier bridge, to ensure that there is sufficient current output, the maximum efficiency of the power amplifier chip. After the stage amplifier: the ultra bass part uses 1 original TDA2050A amplification, the output power of up to 32W, playing DJ is very shocking; left and right channel uses two TDA2030A output amplifier, output power of 18W + 18W, such a power collocation is very reasonable, can be high school bass tuned to the best, meet the needs of different listening.
PCB base material selection: the selection of the PCB substrate is a very good FR-4 all glass fiber board, the thickness of 1.6mm, is a kind of board. The same kind of board with the flame retardant plate belongs to the two kind of board, some paper substrate that is the three kind of board, the hardness and durability of course no good FR-4.
Circuit design: this circuit is designed by the owner himself, the layout is reasonable, the anti-interference is strong, the signal to noise ratio is high, and the noise is near to the speaker. It is not an exaggeration to say PCB design calculation is painstaking: to avoid interference, walk the line by arc, signal line as far as possible surrounded by ground wires, high current, small current, signal to strictly separate walk the line, finally single point grounding, where large current line bold to ensure current to pass through smoothly. Each level between power regardless of the cost back coupling capacitor, effectively restrain ripple interference elimination noise. In many of the same plate without decoupling capacitors or up to 2, pay attention to polish eyes Oh. After the design of the PCB to do the sample, repeated testing to modify the main components of the parameters, to achieve the best after the mass production of the listing.