and 1875 belong to the power amplifier module, not the voltage amplifier chip, do not use as the front stage.
This depends on the frequency dividing point of your dividerThe power of the horn. The total power of the 100W amplifier horn should be limited to 65W.
Integrated circuits suitable for heavy bass power amplifier are: LM388TDA729TDA7294 and other audio power amplifier integrated circuits.
1, the power amplifier board with a soldering iron welding, and wire the horn welding on the power amplifier board, and then left next to standby, it is best to understand the circuit diagram before welding. Then, using blades and scissors, make a small incision in the sides of the wooden box or carton, taking care not to make too muchBig enough to stick the horn on.
2, it is recommended to practice with some wires first. And then, start welding and there's nothing to talk about. Just stick to the circuit diagram. However, it is recommended that you first think about what components you want to weld in what position, and have an overall plan, so that the board will not be messy and ugly.
3, one point grounding, in the wiring of the vacuum tube power amplifier circuit is a measure worthy of attention. It is particularly important for the grounding of the input stage and the voltage amplifier stage. The components that need to implement a bit of ground are mainly grid resistance and cathodeElectrode resistance and bypass capacitance, etc.
4, this is not very difficult, as long as there is no virtual welding of the amplifier tube pin and solder joint, the tin is suitable, and the solder joint is more rounded. And do not appear with other non-connected components tin short circuit can be. 5, it is recommended that you start with a simple, small power can use TDA2282, dual channel output 1×1w, high power can use TDA2030, mono output 18W, their circuits are relatively simple.
1, this is a BTL amplifier circuit. UU2 is an audio power amplifier circuit. C1 is the coupling (isolation) capacitor C2 C3 C6 C7 is the power filter capacitor R1 R2 is the in-phase grounding resistance of the amplifier R3 R4 C4; R5 C5 R6, control amplifier magnification.
2, Q1 is the emitter following circuit, so that the 7 pin gets a 1/2 power supply voltage, as a reference for the power amplifier. The purpose of using Q1 is to try not to affect the effect of resistance partial voltage. The circuits below Rf1 form oneA negative feedback loop allows the circuit to work steadily without losing the effect of audio amplification. The rest is easier to understand.
3, this is a TDA2030 low frequency power amplifier integrated circuit (IC) as the core audio amplifier circuit. Its role is mainly to very low audio signals (such as the CD player output can only drive the earphone sound signal), through the amplification circuit to amplify the signal strength, to drive high-power speakers to emit a larger sound.
4, this is a BTL power amplifier. The 2-pin capacitor is the power supply fading, of which the 0.1U capacitor is the high-frequency fading. Should, 45 (2). Maximum output power: 4X41W/ 4ω (3).4X25W/ 4ω@14V, 1KHz, 10 (4). Low distortion (5) Low output noise (6).ST-BY function (7). Mute function (8). Power supply voltage detection, automatic mute at minimum.
3, the function of the DC power supply is to stabilize the unstable direct current to the voltage required by the load, which is its function. The role of DC voltage regulator power supply is mainly to provide one or more groups of constant, no fluctuation, can reach and meet the working conditions of the circuit or loadThe current power supply is the DC regulated power supply.
4, foot 5v boot, 5v standby. 22 pin 5v work, 5v mute. The two feet are high voltage to play the sound normally, using 22 alone can be connected to the 5v power supply. Abnormal voltage Check the external voltage signal circuit.