High-quality economical car power amplifier based on the TA8215 chip. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Automotive power amplifiers

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I suggest you make a simple and inexpensive AF power amplifier. Its basis is the TA8215 microcircuit with a bridge terminal stage, which makes it possible to obtain significant output power at low supply voltage!

Another positive side of this UMZCH is that it can be used not only at home, but also in a car. (Often the use of a pre-amp is redundant!).

Main Specifications:

Supply voltage, V……………………9…18
Rated output power at supply voltage 13 V, W………2*15
Rated output power at a supply voltage of 15 V, W……….2*18
Load resistance, Ohm ……………..4
Harmonic coefficient at output power 1 W, supply voltage 13 V, load resistance 4 Ohm, at a frequency of 1 kHz (maximum),% ……….0,04
Frequency response range …………….20…20000
Output voltage in the absence of a signal, V ………….0,3
Operating temperature range, С* ……………………-30…+60

As mentioned earlier, the UMZCH is made on the basis of the TA8215 microcircuit inside the microcircuit consists of nine functional units - two pre-amplifiers, two phase inverters, four final power amplifiers with a bridge load switching circuit (two per channel) and a monitoring and protection unit (against overload of the final amplifiers and from exceeding the temperature of the microcircuit case, etc.).

The volume level is regulated by a variable resistor R1, and a variable resistor R2 (group A) adjusts the balance of signal levels in the channels. Resistors R3 and R4 adjust the sensitivity of the amplifier. Further, stereo signals through the conders C1 and C2 are fed to the outputs of the microcircuit. The signals amplified by the microcircuit can be fed to acoustic systems of the appropriate power. Correction circuits R7C6, R8C7, R9C8 R10C9 improve the stability of the UMZCH. The supply voltage is filtered by the C1 conder and fed to the corresponding pins of the microcircuit, the amplifier is put into operation by applying voltage to the stand-by input. Which, through the resistor R6, enters pin 4 of the DA1 microcircuit with a high level voltage. The HL1 LED signals the transition of the UMZCH to the operating mode.

For the manufacture of a stereo version of the amplifier, one TA8215H chip is used (P. max 2 * 18 W), but instead of it you can use a cheaper analog chip from the same TA8215AN or TA8205AL line (P \u2d 18 * 2 W) with minor additions. (to pins 7 and 1000, solder 8210 pF conders connected to a common wire) preventing self-excitation of the UMZCH at high frequencies) you can use TA2AN (P = 22 * 2 W) in similar cases, and for a load of 8220 Ohm resistance, TA8221N microcircuits can be recommended, TA2AN (30*8205 W). The operation of the UMZCH was tested with TA8215AN, TAXNUMXN microcircuits.

After assembly, the UMZCH does not need to be adjusted and is operational immediately after power is applied.

Installation and selection of parts

The power and input circuit wires must be thick enough (at least 0.75 mm). All input circuit wires must be shielded, preferably for each channel separately. It should not be allowed that the wires of the input circuits are located in parallel with the power wires and output circuits of the UMZCH.

The installation of UMZCH elements can be both hinged and made on a printed circuit board. But in any case, all connecting conductors between the pins of the microcircuit and the elements of the amplifier should be as short as possible. The microcircuit must have good thermal contact with a heat sink of the appropriate size (at least 500 cm1 in area), to reduce the size, you can use a finned heat sink with a fan from the PC processor. The heat sink must be necessarily connected to the common wire of the electrical contact of the heat sink surface by the microcircuit amplifier! polarity must be observed when connecting speakers. It should be noted that bridge amplifiers are characterized by failure when the outputs of the microcircuit are shorted to a common wire or when the supply voltage is erroneously applied to it with reverse polarity. limits. The resistance of the resistor P1 is allowed within 10 ... 47kΩ; Capacitors C1 and C2 can be 1 ... 10 microfarads for a voltage of 6,3-100 V; P5-P 1,2 ... 2 kOhm; P7-P10 - 2 ... 10 Ohm; capacitors C3-C5 - 30 ... 100 microfarads for a voltage of 6,3-100 V; C4 - 100 ... 500 microfarads for a voltage of 10-100 V; C10 - 100 ... 470 uF at 16-100 V; C6-C9 - 0,1 ... 0,5 μF; LED NL1 of the AL102 series and the like of any color of luminescence.

Power supply unit

To power the UMZCH, it is necessary to use a powerful stabilized power source (the TA8215N microcircuit consumes a current of about 3 A at maximum power). the power supply circuit is shown in Fig. 3. turning it on and off. Produced with one button SB1. relay RES1 (rf22-4.523.023) was used as K00.

The step-down transformer must provide a voltage on the secondary winding of 17 ... 20 V at a current of at least 3 A. The voltage based on the transistor VT1 is stabilized by the DA1 microcircuit, the stabilization voltage of which is set by the construction resistor P2. before connecting the PSU to the amplifier, it is necessary to achieve a constant voltage of 15 ... 16 V at the output of the PSU by adjusting this resistor. The PSU is not critical to details, it is only important that the voltage and power dissipation levels do not exceed the allowable values. Even with increased voltage in the network.

Publication: cxem.net

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