Auto 400. Car amplifier based on the STK4048XI chip. Scheme, description

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Auto 400. Car amplifier based on the STK4048XI chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automotive power amplifiers

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So, it all started with the fact that I bought a car, and since I really like to listen to music and it is practically everywhere with me (music), I wanted it to be of high quality in the car and, of course, loud. Somewhere in the course of a month, having changed about ten car radios and not getting what I wanted so much, I climbed headlong into the Internet. I talked on some forums and got some information (personal thanks to Rotor, and maximus), I decided that I wouldn’t “knock out” the sound from the car radio so easily. Poryskav a little more and poraskinuv brains, it was decided to make a powerful converter and amplifier. Having found a couple of normal converter circuits, I "blinded" one, in my opinion, excellent. But since I wanted to do the "thing" once and for a long time, then the power chosen can also be said to be large (which I now regret). I called the amplifier, "AUTO 400".

Well, first things first.

First I settled on the TDA7294V chip, well, I really wanted to get louder, and the reviews on the forums about it are not very good, then the board is properly diluted, then it self-excites, well, in short, I didn’t like it. Reviewing the magazines "Radiohobby" Art. 10 4/99 I saw a good diagram. The amplifier was made on the STK4048XI chip, author Anton Kosmela (in Fig. 1).

Rice. 1 (click to enlarge)

A little about the circuit: L1 is wound on a 10 mm frame and contains 18 turns of PEL-1,2 wire. Both microcircuits are mounted on a radiator made of aluminum U-shaped profile 210X11X25 mm. The amplifier does not require any adjustments.

Looking at her characteristics, she approached me with a "head". With a two-polar supply of 55 V, and a load of 8 ohms, it gave out 150 W of power, and at 4 ohms 200 W (not bad at all). And this is only one channel, two channels 400 W at 4 ohms with a harmonic coefficient of no more than 0,007% and a frequency band of 20 Hz - 50 kHz. This is all good, but how to "feed" such a "beast", you need a converter of at least 400-450 watts. Since I did not want to listen to the “hum” in the speakers from the converter at such powers of 50 Hz, it was decided to make a high-frequency one, at the same time a smaller size. Said done, on the TL494 chip with output voltage stabilization, see fig. 2

Rice. 2 (click to enlarge)

A little about the converter circuit: the converter transformer is wound on a ferrite ring of size K45X28X16 (a little small, but there was no other at hand). The primary winding is wound with an "oblique" of 8 wires with a diameter of 1,2 mm (6,5 turns), the secondary (to stabilize the output voltage of 10 turns), the secondary for powering the amplifier is wound with an "oblique" of 4 wires with a diameter of 1 mm, (the number of turns before this needs to be selected, in my case 55 turns). After winding, each "braid" is divided into two parts and the beginning of one half of the winding is connected to the end of the other (be careful, the windings must be wound in the same direction when connected, and not no matter how the turn, otherwise it will not work). The chokes are wound on a ferrite rod with a diameter of ~16 mm and contain ~10 turns of wire with a diameter of 2 mm. Replacements: BC558-KT626, IRF540-IRFZ44.

Auto 400. Car amplifier based on the STK4048XI chip. Figure of the printed circuit board of the converter
Fig. 3

The amplifier was additionally equipped with protection, well, there isn’t much there, but it’s a pity for the speakers (but that didn’t help).

The story continues.

After installation on the car and the so-called "test", my hearing returned to me for two days, and I was very pleased (with the sound). I’ve had it (amp) on my car for two months, I’m used to the volume, but it’s a pity I’ve already ruined four speakers (the seller spoke at 250 W, but they burned out), now I’m looking for normal ones, or can I put a couple of pieces in series?

For those who are interested, I drew the diagrams using the sPlan ver 5.0ru program.

Publication: cxem.net

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