Hello to all DIYers! A friend recently gave away a burned-out car radio, bought in a hypermarket with working USB and FM. Connected to power - earned. I took it apart further, a piece of plastic was knocked out on the output microcircuit - everything is clear, the outputs were closed. I decided to restore it, since I had three free days, and I recently collected it.
I bit out the output chip, soldered the power, inserted a USB flash drive and began to check the signal with a probe. Found the left and right channels of sound. I connected it to TA8205 and almost went deaf from distortion and 50 Hz background. 3 hours of tambourines with dancing and a solution was found. At the input, the resistor is 30 kilo ohms. But I didn’t figure out the power supply, I had to install a small 12-volt transformer and a stabilizer on Krenka for the radio.
The sound turned out to be more or less decent and powerful, it’s the most for the garage. I decided to get confused with the case, right there in the garage I found a plastic speaker according to the size of the front panel of the radio, I cut more than half of the case with a “grinder”. I cut out a window for the panel, a radiator, a switch, speaker terminals, and cleaned it with a file. I put the transformer for the amplifier native from the center, it turns on through the relay from the signal of the radio itself. I screwed everything where with bolts, and where with hot glue.
Well, in addition, I decided to adapt output power indicators on the LM3915 into the case, since there were 2 pieces in the gas holder and recently I bought 500 pieces of 3 mm from the Chinese. LEDs for 250 rubles. I drew 2 scarves for microcircuits and LEDs, with a marker, the printer ran out of toner. Soldered the whole thing, plugged it in - it works. It turned out to be a good a la music center. The photos show the entire assembly process.
Surely every car enthusiast had the idea to use the car radio, in addition to the car interior, whether in the garage, in the country or in general in the space of his room.
Well, why not? After all, even the most standard car radio, the price of which is incomparable with the price of a music center, having normal output data and not the most famous manufacturer, is able to “rock” home speakers without loss in sound reproduction quality.
And if, in addition, the car radio has a multi-channel output, then by connecting all the provided acoustics to it, as a result, we get an almost full-fledged home theater, assembled by ourselves.
Since by default we will use a device lying around to create a home-made one, then any car radio will suit us.
But this “any” should still have a minimum set of functions:
In addition, you should pay attention to the sound card of the device itself. Some radio tape recorders can even surpass most modern music centers in terms of purity and sound quality.
And although due to the fact that the car radio does not have large and capacitive capacitors in its “arsenal”, due to which it loses in reproducing low frequencies to powerful stationary acoustic systems, it is definitely at its best in reproducing the high-frequency range. Also, a certain advantage of the car radio is the presence in it of a multi-stage equalizer separated by frequencies, while most of the stationary music centers are equipped with only standard presets.
So, the essence of the issue is clear to us. The car radio with speakers (see) has long been lying nearby on the table and "asks to fight." Now, only we alone do not understand how we can “make friends” of 12-volt equipment with a 220-volt variable network?
I must tell you that this task has several solutions, which are contained in the instructions below on how to connect the car radio from the 220 network.
This method is the most complex and time consuming. Although the level of modern electronic technology allows us to completely abandon it, we, due to the fact that we are considering all the ways on how to connect car radios to 220 V, will still pay due attention to it.
So, before connecting the car radio to the 220 network, we will have to create a step-down transformer up to 12 volts with our own hands.
Why do we need:
In order to facilitate the task as much as possible and not to disassemble the transformer winding itself, we use the free space of the magnetic circuit area. We wrap the free area of the magnetic circuit with insulating material and wind a piece of wire of our choice of arbitrary length on it.
Let's say we got seven turns.
In order to calculate the number of turns needed to lower the voltage and the length of the wire, we need to do the following procedures:
For aesthetics and convenience, we attach an additional block to the bracket and attach conclusions to it.
Do not flatter yourself, in addition to the work done, we need to connect a diode bridge to the resulting device, to rectify the current and remove its ripple (diodes can be taken the most common - D226). Then connect with a load, in series a choke with a large inductance (it can be from a tube receiver or from a 402 watt LDS) and in parallel two capacitors K50-18 50 volts of 10000 microfarads each.
As a result, the whole scheme should look something like this:
Advice! All of the listed components can be found in a tube TV thrown into a landfill.
The diode bridge can be made from individual diodes ...
... so in the form of a monolithic structure (assembly) ...
… which is preferable due to its low cost and compactness. The only negative can be considered its complete non-repairability, since when one diode stops standing, you will have to change the entire monolith.
Next, we assemble the entire circuit, place the resulting structure in a case prepared in advance, connect the car radio with speakers and enjoy music with friends. At the same time, as if by chance, uttering the phrase “home-made music center” in a conversation with them)))
As we found out earlier, all car radios are "powered" by direct current and require 12 volts for their needs, no more - no less. Just these output parameters have stationary uninterruptible power supplies and various network adapters.
When choosing this device, you need to pay attention to the output current, it must be at least five amperes. It should be borne in mind that at maximum loads, the car radio can consume up to 10-15 amperes, but I repeat - only at maximum loads!
Of course, there are also more powerful power supplies on sale, created specifically for these purposes, but their price is such that all the feasibility of creating a home-made speaker system is nullified.
We cut off the standard connector of the car radio, which is designed to connect to the car, and strip the ends of the power wires to connect them to the network adapter or uninterruptible power supply. The speaker wiring can be left in the old connectors and the acoustic circuit can be assembled through standard “connections”.
In general, the connection diagram of the car radio is as follows:
Naturally, instead of a battery, we mean an uninterruptible power supply or a network adapter that produces the necessary stable 12 volts at the output. As you can see from the photo, the connection is nothing complicated: we connect the radio in the usual way and enjoy pleasant music.
Since the topic of the article has already been fully disclosed and the meaning of the third method is already clear, let's get straight to the point.
The advantage of this method is that it is not difficult to find an old and working computer power supply, and the demand for a used device is so low that it can be purchased at any radio market or computer workshop for next to nothing.
Although, in most cases, used power supplies from personal computers are in working condition, before connecting to the car radio, it must be checked, and if necessary, prepared for work:
Attention! Before each opening of the power supply, it must be disconnected from the mains!
Attention! High-voltage electrolytic capacitors have enough residual electric current to give them a mild, rather unpleasant electrical shock.
Advice! Before you start repairing the power supply with your own hands, it is necessary to discharge the high-voltage electrolytic capacitors of the output current rectifier by connecting a 100 or 200 kΩ resistor to the capacitor contacts in parallel for a few seconds.
Well, at the end of the preparation of the computer power supply, for greater solidity, it can be painted from an aerosol can with spray paint (available in any car store) to match the color of the interior of the room or the entire speaker system.
Each computer power supply has several power harnesses with output connectors, where the black wire is negative or common, and the yellow wire is supplied with the 12 volts we need.
Since the computer unit of the AT format does not have a standby power supply “+5” or otherwise as “Standby” and an output voltage of 3.3 volts, then when it is turned on, its outputs are “+12V”, “+5V”, “-12V ”, “-5V” voltage appears immediately. Therefore, in the presence of an "a-tesh" power supply unit (AT), the necessary wires are "bitten off", and the entire above acoustic circuit is connected to the power wires of the car radio.
In the case of an ATX power supply, some refinement is required. The fact is that this type of PSU (power supplies) is equipped with a standby current source with a voltage of +5 volts (Standby).
This standby current source works constantly when the PSU is connected to a 220 volt network and puts the entire system into "sleep" mode. Therefore, if you want the provided voltages “+12V”, “-12V”, “+5V”, “-5V” to appear on the output channels immediately after turning on the PSU. "+3.3V", you need to close its connector contacts by installing a jumper on the black and green wires.
You probably already know that the car radio also has sleep and operating modes, and as soon as the driver closes the electrical circuit by turning the ignition key, the car radio automatically switches from “sleep” mode to “active” mode.
It follows from this that if we connect the main wires of the car radio black - minus (Ground) and yellow - plus (Battery), to which the voltage of the car's on-board network is connected, to the corresponding terminals of the power supply, the car radio will not turn on, it will be in "sleep" mode. In order to eliminate this misunderstanding, we will have to find the red wire marked "ACC", which is connected to the ignition switch in the standard circuit, and connect it to the yellow wire of the car radio, after which the car radio will start immediately when voltage is applied to it.
This concludes the instruction on how to connect a car radio from the 220 network with your own hands. In conclusion, I would like to draw your attention to the fact that car radios with a remote control are very convenient for the “home” version.
Agree, in the car, the remote control is still mostly idle, and at home every time getting up and going to the radio to switch the track or to adjust the volume is somehow not very convenient. With the remote control, the process of listening to music will be much easier and more comfortable.
With the right tools, you can transform your car stereo into a home music listening device. You need suitable hardware such as a power supply. And in a few steps, you can turn your car radio into an indoor listening device.
You need a power supply to create a music center. But it doesn't have to be new. If you have an old computer, unplug it and use it for your project.
While using a power source to power your car stereo at home is one way, you can do it even if you don't have a box.
Although most radio tape recorders have a different number of outputs and inputs, it is not difficult to find a method to connect them to a 220-volt network when making a home audio system. The standard wiring diagram for connecting cables looks like this:
To power the system, a regular old PC power supply is used. Before connecting it to the system, you need to check that the device has enough power to get 5 amps.
Required connectors for connection:
ATX type power supplies must be connected via control connectors. They are on the 24 pin comb.
The image shows which wires need to be connected to the car radio.
The back of the device looks like this:
For different types of radio, the location of the power supply, the number of sound outputs and other parameters may differ. Only the color codes of the cables do not change.
To check the music center, you must first download the audio file to a portable storage medium with a USB output. After that, turn on the music center in the voltage network. An indicator should light up to confirm that it is on.
Then insert the flash drive into the correct USB port. If all actions were performed correctly, then the speakers should play sound. If there is no sound, then turn up the volume or check the connection of all contacts.
In the garage, many motorists often have old radio tape recorders lying around idle: they remain after buying new equipment or the car is sold without music. You can find its application at home or in the country. Even an inexpensive car radio is able to overtake many home audio devices in terms of sound quality and purity. Let's get acquainted with how to make a music center with your own hands.
The main things you can't do without in this case:
After the assembly is completed, turn on the power supply and check the capabilities of your music center. Do not forget to turn off the power supply when turning it off.
