Many electronics circuits and projects for learning in simple ways.

High quality Tri Audio amplifier with crossover network built-in

A tri audio amplifier has three in one a amplification act drive specifically each audio speakers makes the sound quality is very good.

Normally amp can drive three speakers at the same time are the woofer, mid-range and tweeter. Which may have limits such as: the impedance of the speakers,the loss of signal in Crossover Network. But it’s very expensive.

Thus when compared to the same quality and power. The price of the amplifier and crossover network, combination is more than the price of this the tri audio amplifier has three in one a amplification act drive specifically each audio speakers makes the sound quality is very good.

Normally amp can drive three speakers at the same time are the woofer, mid-range and tweeter. Which may have limits such as: the impedance of the speakers,the loss of signal in Crossover Network. But it’s very expensive.. When viewing the various elements, then are seen as better in every aspect. Although there are not a lot of power. But it’s only for listening in your home or bedroom very well.

The working principles
The tri audio amplifier has three in one a amplification act drive specifically each audio speakers makes the sound quality is very good.

Normally amp can drive three speakers at the same time are the woofer, mid-range and tweeter. Which may have limits such as: the impedance of the speakers,the loss of signal in Crossover Network. But it’s very expensive. will be has the separation a range of frequency of 3 ranges consist of a low frequency ( bass) , the medium frequency(midrange) and the high frequency (treble) then send to the amplifier drive to each speakers. This circuit has frequency separation is cut off at 300Hz for low frequency range, then cut off at 3 KHz for midrange and the frequency exceeds 3KHz for the high frequency.

high-quality-tri-amplifier-circuits-with-crossover-network -built-in

How this circuit works
As shown figure 1 is the successfully circuit of the tri-amplifier project. A resistor-R1 will be connected between input and ground to control input signal does not too much and makes a constant impedance input. The C1 act as coupling the input signal to a low pass filter circuit. Which consists of R3,R4,C2 and C3 the signal that through this filter circuit will be low frequency under 300Hz only. And this signal will be the input signal for IC1(TDA2030) to amplify and then to the drive transistor TR1 and TR2 to increase audio rises next. Two resistors R7 and R8 are bias to TR1(BD239) and TR2(BD240),

A R6 is feedback. By has C4 and R5 are divider the feedback voltage. Both R9 and C9 are load for circuits. The capacitor C8 act as coupling output signal to drive the woofer speaker.

The middle sound frequency are about 300Hz – 3KHz will passes the mid rang filter circuit consists of C10,C11,C12 and R10,R11,C12,C13. Which is filter 2 step in series together. And this signal is input signal of IC2(TDA2030), that IC2(TDA2030) will expanded power up. The R15 is the feedback. And R14,C14 are the divider feedback. The R16,C16 are load of circuit. The C17 act coupling the output signal to the Mid-rang speaker.

And the high rang that has frequency exceeds 3 Khz , will passes the high pass filter circuit that comprises C18,C19,R17. The signal form this section will be input signal of IC3(TDA2030). Which act as amplifier the signal rise. The R20 is a feedback. And C20,R19 are divider a feedback voltage. The R21,C21 are loadof circuit. The C23 act as coupling the output signal to drive Tweeter speaker. The R22 and R23 are connected as the divider circuit Serve to separate the voltage to half of the power supply circuit. By C24 is maintain the voltage to smooth and constant. This voltage is a bias the voltage to the input (pin 1) of IC1, IC2 and IC3. By R2, R13 and R18 limit the current is not too much. Diodes D1-D6 protects the IC from damage from the feedback voltage . C7, C15 and C22 helps eliminate noise from the power supply. The C6 filter to smooth the power supply circuit. By diode D7 is a diode bridge rectifier of the AC.

pcb-of-high-quality-tri-amplifier-circuits

Let’s build this circuit.
This project is easy, since we use popularly components, as shown in figure 2 is PCB layout. I think you can make them.

This Post Has 2 Comments

  1. Pls how much wattage can this circuit provide?

  2. How can i buy this board?

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