About the problem of 2 in 1 sound, solve, thank you!

Problem 1: This is a bit difficult, pt2353 is an electronic volume control class, if it does not have a memory function, it can only be changed to the traditional potentiometer method. PT2353 can not change the circuit randomly.

Question 2: What is the purpose of the 16-pin string resistor? I didn't even say this, so I wanted to ask how much resistance I needed?!

Question 3: I don't know if the TDA2030A you use is **, I made the TDA2030A power amplifier myself, the filter capacitor positive power supply is 4700U, and the negative power supply is 4700U. The impact of the switch is very small.

The TDA2030A is equipped with on/off protection (i.e., on/off shock protection). The delay circuit or the horn protection circuit can remove the impact sound of the power on and off. You can buy a finished board or do it yourself, and pay attention to the delay time by yourself It is best to set it to 2 seconds to 3 seconds (adjust the charging capacitor resistance by yourself).

It takes a few seconds to turn on the horn when it is turned on, and it is immediately disconnected when it is turned off. To achieve the purpose of removing the impact sound.

Delay circuit application: disconnect the line of the power amplifier output to the horn (the ground wire does not need to be disconnected), and then string into the delay circuit board. The power supply of the delay board is taken from the secondary alternating current of the transformer, and if the power supply with rectifier filtering is taken there is no shutdown protection function, because the capacitor discharge will make the shutdown unable to disconnect the horn immediately.

I have made a horn protection circuit myself (the horn protection circuit includes a delay circuit) and adjusted the over-delay time. You can delay as long as you want.

The string resistor can be strung with a fine-tuning resistor, and you can adjust the level as much as you want. Medium power for triodes and 1N4007 for diodes. Trimmer resistor 470k.

The relay can be selected as either 12V or 24V depending on the power supply. Filter capacitor 47 100u. Charging capacitor 100 470u.

There are many such circuits on the Internet. The relay is engaged, and the set of strings that are turned on is between the amplifier output and the horn.

It's better not to do it yourself.

The initial volume can be set a little lower.

Delay:.. It is also not recommended, because if you do not do it well, it may cause damage to the host.

The sound cannon is very difficult to play at a small volume,Because bass is very energy-consuming,So if your subwoofer is not an active speaker,The effect will be very general,You say that the overall sound is too big after amplification,There is an emergency method,There is an equalizer in the sound card settings,You appropriately increase the bass volume。

The problem of current shock when the speaker is turned on can add a power sequencer, or don't add anything, you turn off the power amplifier and then power it on, and then turn on the power amplifier from the front stage equipment at a time, and finally turn on the power amplifier. As for the adjustment of the bass, I don't know what the internal program is like, it is difficult to answer your question, if you use computer software to play the sound, you can use the equalizer to adjust the low frequency.

First, first confirm that the hardware is fine. If there is nothing wrong with the speaker, there is no problem with the sound card, and if you have tested it on other machines and it is indeed good, then the verdict can continue to look down.

2. Make sure all the cables are exactly right. Then power on the speaker and turn on the volume switch.

3. Install the driver of the sound card correctly, if it is an onboard sound card, it is best to install the driver provided on the driver disk of the Juhuai motherboard.

In fact, the computer does not make a sound, and many times it is because the sound card is not driven correctly. In general, after the sound card driver is installed, there will be a small speaker icon in the taskbar in the lower right corner. ）

Fourth, if you are sure that the driver is installed correctly, then take a look at the volume settings in the computer.

The specific method is to double-click the speaker icon in the taskbar, and check whether the volume is turned off to the minimum in the "Volume Control" and "Waveform" dialog box in the pop-up "Volume Control" and "Waveform".

If these two options are not available in the dialog box, click on the "Options" menu - select "Properties" - select "Volume Control" and "Waveform" in the "Show Volume Controls" and then set them correctly.

Note: Step 4 can only be set up after the driver for the sound card has been installed correctly.

The connection between the main unit and the speaker is divided into two, that is, the left and right channels (L, R), please confirm whether it is correct.

You can reverse the left and right channels, see if the sound of the channel is reversed, if it is reversed, that is, there is a problem with the connection cable from the main unit to the speaker or a problem with the computer settings.

If you reverse the left and right channel inputs or the original channel sounds, check whether your speaker has a balanced channel twist, if so, turn it to the middle, if not, it means that one of the speakers is broken.

It may also be a problem with the audio, it is recommended that you change the speaker to try it to see what the problem is**.

Philips, Edifier is still good, Philips** is more expensive, there are more fakes, consumers are more passive when choosing, it is not easy to distinguish, Edifier's words,**Although it is cheaper, but there are still shortcomings, that is, it is mainly to do low-cost audio, so there is still a certain lack of sound quality, can not be too demanding, and these two are similar to BT-Audio's ab hifi is relatively good, The AB bookshelf box is a HIFI box with excellent overall performance, reproducing the classic pure British sound. Using super instantaneous reaction unit, the treble is not scattered, the bass is not sticky, the strong sound is not dry, the weak sound is not false, the warm and mellow sound shows the infinite charm of the **, you can feel the legendary and charming melody of the British sound, and enjoy the bloodline, sound quality, and workmanship are all excellent HIFI speakers.

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It is suspected that the diode or LED of the power indicator is broken down or poorly contacted, or it may be that other parts are poorly contacted or short-circuited, and it is a little difficult to repair it yourself, so return to the factory or send it for repair.

Stereos have electric current sounds, depending on what kind of current sound it is. Sparrow's feast.

1. Low-frequency "humming" current sound.

The judgment of this current sound is to turn off the volume potentiometer to the minimum, at this time, the sound still has a humming sound, and its fault is caused by the small capacity of the filter capacitor of the power supply system, and the solution is to increase the capacity of the filter capacitor.

2. As the volume increases, the hum also changes.

This kind of current sound belongs to the pre-voltage amplification, so the high acacia barrier. For example, the ground end of the audio input line is open, the contact is poor, and the sound source itself has a humming sound. It is also the uncoupling in the circuit, and the electronic components in the circuit are open or failing.

3. The current sound is a fault of "squeak" sound.

Most of this current sound is affected by the interference signal, because the current electrical equipment is a high-frequency electrical appliance, such as energy-saving lamps, chargers, inverters, etc., all use high-frequency circuits, if the sound anti-interference function is not good, it is easy to appear this phenomenon. Can the power supply? The plug is inserted in reverse and sometimes works.