Landline phone amplifier on one transistor it will be quite possible boost home phone signal to a sufficient level. Landline phone is now obsolete and a thing of the past, but in some places it is still used. Only the quality of communication via a landline phone leaves much to be desired. This is due to the weak and quiet sound from the telephone handset, which can be amplified by an amplifier. The fleet of landline telephones today is mostly old, sometimes even Soviet telephones with poor audibility. In most cases, these are primitive, purely analog devices, without signal amplification functions. The sound of such telephones is very quiet and sometimes it is difficult to understand the words of the interlocutor. But there is a way out - you can solder a homemade sound amplifier for your phone.
What determines the sound volume on a smartphone?
Often, users do not see the difference in the operating principle of the OS of a Hi-Fi player and a smartphone. It is for this reason that buyers do not understand why a smartphone with a sophisticated DAC sounds much worse than a simple player with the simplest components. Here, the chain that the sound signal passes through before the human ear is able to perceive sound waves plays an important role. Individual blocks have the most noticeable impact that can spoil the final result.
So, the whole path looks like this: file – player – OS mixer – volume control – DAC – amplifier – headphones. This is the most primitive and common route, but in order to understand the problem in more detail, you should consider each stage separately. This path may change for different operating systems; let’s consider a separate case based on Android.
For laptop
The sound wave amplifier must take into account the power of external speakers up to 2 watts and winding resistance up to 4 ohms.
Assembly components:
- 9 volt power supply
- printed circuit board
- chip TDA 7231
- frame
- non-polar capacitor 0.1 µF - 2 pcs.
- polar capacitor 100 µF
- polar capacitor 220 µF
- polar capacitor 470 µF
- constant resistor 10 Kom m 4.7 Ohm
- two-position switch
- input socket
Original file quality
Of course, the quality of the source material affects the subsequent sound, but in comparison with other factors, the distortion is small and can be easily compensated for using simple applications. However, it is better to choose files from higher quality sources. This will help avoid some inconveniences.
Player selection
It is the player that facilitates the transmission of the sound stream further, i.e. distributes it throughout the system. If we do not take into account the various effects used to process sound signals, we can conclude: the main effect is exerted by the set of decoders, which each player has its own. We can say that sometimes the sound can be transmitted unchanged, and sometimes it is significantly distorted.
Mixer OS
This block is what distinguishes a Hi-Fi player and a smartphone running Android OS. The task of this stage is to accept one stereo stream. But the problem is that not one application can play sound, but several at once. A striking example is notifications from applications that come while listening to music while playing a game. Here you can observe three different audio streams at once, having different sampling rates and bit depths. The task of the mixer in this situation is to combine all sounds into one single stream, which means bringing them to the same frequency. This principle is typical not only for Android, but also for other operating systems.
The need for a mixer disappears only when there is only one sound source. But this happens extremely rarely. The function may turn off spontaneously in order to save energy. Now this possibility is not practiced. The necessary data is automatically entered into the system. It is the constant conversion algorithm that negatively affects the quality of the final sound.
If we talk about PCs, then the system mixer is useless, so Windows practices two universal options: WASAPI and ASIO. These applications help sound get into the device driver, and then into the DAC, without the participation of the system mixer.
This organization of the signal route ensures that only one application is responsible for sound reproduction. The rest are inactive. If we consider this possibility in practice, it does not always turn out to be useful, because, for example, if a track is playing, the notification from Skype will go unnoticed. To solve this problem, they now often use a driver that can accept two streams at once: one from WASAPI and one from ASIO. They are then mixed and played back in good quality.
If you understand the algorithm for outputting sound signals, you can conclude that for Windows OS everything is more or less clear and has clear names, but with Android things are much more complicated. Android smartphones use analogues of the above two PC programs. Such measures help to bypass the system mixer and transmit the stream further.
FiiO Hi-Fi players on Android have a separate mode in which all background and unnecessary programs are turned off, and only the software player remains functional.
Telephone amplifier assembly.
The telephone amplifier was originally designed in such a way that its board was located in the handset of the telephone . It is assembled by surface mounting, on a piece of PCB from an old board . Using a mini drill, holes were drilled in the board for the parts in place and mounted on the amplifier board. On the reverse side of the board, the pins of the parts were soldered according to the given amplifier circuit. The handset , just like the telephone board (see diagram), has the same contacts 8, 9, 10. The telephone amplifier located in the handset . The telephone capsule must be disconnected from handset contacts 9, 10 and soldered directly to the amplifier (see diagram).
What to do if the sound is unsatisfactory
The vast majority of smartphone speakers cannot boast of good sound quality. Added to this is the poor quality of sound output through headphones or speakers. And sometimes there is no connector for audio output from other devices. At such moments, users do not know what to do to increase the volume of their favorite tracks and truly enjoy them. Then special programs come to their aid, helping to quickly and efficiently increase the volume. They are especially useful when the problem lies directly in the downloaded file: it is of poor quality, which is why the sound level is too low, or is simply damaged, so it plays quietly.
And the first thing that comes to mind is searching for the desired application through the Google Play Store. The result is an endless list of different options, each of which has an enviable rating according to user ratings. Any description leads one to believe that the sound quality will indeed improve, both in standard use of the speakers and when listening with auxiliary devices. However, in practice it turns out that the bulk of the proposed programs do not work at all as stated, and sometimes a logical question arises: does it work at all? After all, users do not observe any positive changes. In addition, almost all applications are now “plastered” with a huge amount of advertising, which “pops up” very often, annoying at the same time, which further spoils the impression of using the application. Therefore, the user must be more selective when choosing, so as not to waste time on useless wanderings on the Internet, which ultimately will not bring the desired result.
How to boost your home phone signal.
To amplify the signal of a home telephone, it is enough to assemble a simple amplifier using one transistor and power it from the circuits of the same telephone. A regular landline home telephone is supplied with low-current power via a wired communication line, with varying voltage, depending on the operating mode of the telephone (standby, call, conversation). This voltage can be used to power a telephone amplifier. That is, the amplifier does not have to be powered from a separate voltage source. At the same time, this simple home telephone amplifier will in no way disrupt the operating mode of the telephone , since the current consumed is a few milliamps.
Android Applications
Volume Booster - Headphone Audio Amplifier
The application from Magic Mobile Studio maximizes the sound of your smartphone. Its rating in the Play Market is one of the highest. You can adjust the bass and create a surround sound effect. Sound amplification occurs in relation to all applications. The interface is simple and convenient, so there are no problems with use. Moreover, the sound of both the external speaker and the headphone player is enhanced.
Advantages:
- High rating;
- Ease of use;
- Enhances sound from both external speakers and headphones.
Flaws:
- Not detected.
Precise Volume
The application is an equalizer and amplifier at the same time. Thus, the sound quality from both external speakers and headphones is noticeably improved. Moreover, you can also use the function to enhance the bass or create a surround sound effect. This is achieved by using the built-in 5-band equalizer.
Saved settings affect the system as a whole. Any application adapts to the saved sound level. Maximum sound amplification can be dangerous not only for the speaker, but also for your hearing. You can create individual settings, which is very convenient, because... the user can select the values that suit him.
Advantages:
- Equalizer and amplifier at the same time;
- Possibility of creating a surround sound effect;
- Creation of individual settings.
Flaws:
- The entire system adapts to the stored values.
Volume Booster GOODEV
The only task of the program is to increase the volume in combination with a simple interface. The slider helps increase the volume by 60%. However, this value is saved by default, i.e. It is allowed to increase the volume to a higher value. However, the app is set to automatically limit the sound volume. The default program launch can be set so that when you turn on the phone, all settings are applied to the entire system.
Advantages:
- Significant improvement in volume;
- Simple interface.
Flaws:
- Limitations set by the program itself.
Super Loud Volume Booster 2022: Amplifier
The program can safely be called super-powerful. At the same time, it has a simple interface, and the volume slider is located in the middle of the window. The remaining sliders help you fine-tune the strength of different types of sound. High frequencies and bass are achieved by using a 5-band equalizer in the system. It allows you to safely experiment and get good results. Thus, the maximum volume can be increased by 4 times, which is quite a serious indicator. However, it should be remembered that not every speaker is able to adapt to such changes, so you can unknowingly harm it. The application provides special buttons that allow you to quickly mute, enhance or normalize the sound. The entire system adapts to the selected settings. But there are some drawbacks: constantly pop-up advertising covers the entire screen. Here you can also add windows that force you to evaluate the results of your work in the Play Store.
Advantages:
- Simple interface;
- Excellent quality of work;
- A large number of adjustable parameters;
- Significant sound improvement.
Flaws:
- Constant advertising windows.
BlackPlayer
The player acts as another good music player that can improve sound quality. This is facilitated by a five-channel equalizer and a whole set of sound effects, which significantly expand the user's ability to improve the sound. The required option can be found in me under the name “Amplifier”, which helps to get results up to 4 dB. All major audio formats are subject to processing. The program can be synchronized with an external equalizer. There is an editor for tags, and a function that manages album covers is supported. BlackPlayer enhances low frequencies, allows you to use a virtualizer and control the sound balance. The interface is pleasing to the eye. It can be customized to suit individual tastes, which is very convenient, and during operation it can be changed according to any preferences.
Advantages:
- Ability to customize appearance;
- Wide functionality;
- It is both a player and an amplifier at once.
Flaws:
- Not detected.
Pro Volume Booster
The program's interface is quite simple, and a large volume control element is located in the middle. The adjustment can be general, or multimedia, calls and alarms can be adjusted separately.
The configured settings apply to the entire system. Those. The sound will be amplified relative to any sound played from the phone. The main disadvantage is the constant full-screen advertisements. They literally encourage the user to evaluate the application in the Play Store. This significantly lowers the overall user experience and is annoying. However, the functionality is good news. It fully complies with the characteristics declared by the developers.
Advantages:
- Simple interface;
- Possibility of individual adjustment.
Flaws:
- Annoying advertising;
- The settings apply to the entire system.
Precise Volume
Download: for Android
This application combines the functions of a sound amplifier and an equalizer. It can be used to enhance music for both speakers and headphones. You can not only adjust the playback volume, but also work with bass and surround sound effects. The equalizer allows you to create your own presets.
The parameters that the user sets in the application will work across the entire operating system. That is, if you listen to music from a third-party player, you can still amplify the sound by up to 12 dB. We do not recommend setting the volume to maximum, as this is dangerous for your health.
Advantages and disadvantages
Adjusting sound to user preferences
Adjustment for different headphones
Responsive to headphones connection
5 band equalizer + bass booster
Reviews
IOS Applications
Equalizer - offline music
The program is considered one of the best among users. The presence of a ten-voice equalizer with 16 ready-made presets makes the sound amazing. It is possible to create your own settings. The user can adjust the bass and treble independently of the equalizer. 9 types of audio formats are supported. A premium subscription allows you to customize 3D sound and add many effects. An important advantage is the ability to use the premium version for 2 months free of charge. Songs with DRM encryption are not supported.
Advantages:
- Wide possibilities;
- The presence of a ten-voice equalizer;
- Supports a large number of audio formats.
Flaws:
- Access to all features is available only through a subscription;
- There is no support for DRM-encrypted audio.
Boom
The instrument acts as a player with a large number of settings that allow you to improve sound quality or increase volume. Other services offer a huge collection for playback. The built-in TOP 100 rating allows you to get acquainted with the most popular tracks. However, it is currently not possible to download through the Play Store, because... the main options are still under development and experimentation. Here you should immediately be prepared to face some problems caused by partial defects. Boom itself limits the maximum volume increase, and other programs do not adjust to the selected settings.
Advantages:
- Player and amplifier in one application;
- Wide range of possibilities.
Flaws:
- Possibility of some bugs;
- Cannot be found on the Play Store.
Volume Booster and Booster
The application allows you to select an already configured preset or create a new one to suit your taste. The equalizer is available in two versions: 8-voice and 3-voice. Moreover, both work at a professional level. The presence of filters and compressors allows you to create effects and enhance the bass, making it truly powerful. It is possible to play music both from the device and from cloud storage.
Premium access provides all the features of the application for individual use. The duration of the subscription varies; the user can choose the length of time. There is a trial period that expires after 3 days, after which you will be charged automatically. An active subscription cannot be cancelled.
Advantages:
- Huge range of possibilities;
- Creation of effects;
- Dual professional equalizer.
Flaws:
- Access to all features is only possible through a paid subscription.
Setting up a telephone amplifier.
Setting up a telephone amplifier comes down to selecting the bias resistor R1. It sets the collector-emitter voltage VT1 equal to half the supply voltage. It is also necessary to select resistance R2 for optimal sound volume and the absence of distortion due to over-amplification.
When installing parts on the telephone amplifier board, you need to correctly wire the power source - the diode bridge. So that the plus power is supplied to the transistor collector through the telephone capsule (see diagram).
Me and Diode. © yaidiod.ru.
What difficulties does the consumer face when choosing
You should start your search for the most suitable option with the Play Store or AppStore. Although the result, more typical for the Play Store, will produce a huge selection of applications with the same name, equally good rating and an amazing number of downloads, there is a more significant problem in the way than their similarity to each other - the main number of them do not show any result . Simply put, they are “dummies” that are not intended for their stated use. Sometimes such applications work only on selected devices, or sometimes they work defectively, but this is already considered a defect in their work, so their use is undesirable.
Nowadays, a lot of spam applications are attracted to a category called “volume boosters.” Their main task is to burden the user with intrusive advertising that pops up every few minutes, and the program itself turns out to be useless. In addition, there are some “viral” applications, advertising from which even pops up on top of other windows or even slows down the operation of the smartphone. Especially annoying are videos with sound that appear at the most inconvenient moments. In a word, such options do not represent a solution to the problem, but only aggravate it, so you should avoid them and be more selective, referring, for example, to the advice of experienced users or expert opinions. This approach will help you find a truly effective tool in a short period of time.
Tools and Supplies
If you assemble it yourself, all expenses will not exceed 2000 rubles, and this includes the purchase of a soldering iron. If you already have the device, then the price will not exceed 500 rubles.
What can you use to assemble a simple sound amplifier:
- TDA series microcircuit (price from 240 rubles, it is better to buy in radio electronics stores than to order from China - it will be even cheaper);
- radiator grille for cooling the device.
It is important to note that specific models of circuits, transistors and capacitors depend on the purpose of the amplifier. This is discussed in more detail below.
You can purchase a remote switch. The features of clapper switches make them especially popular for amplification devices, because you can turn off the sound in just a second from anywhere in the room.
Additional tools will be needed. To simplify the creation process, it is better to use a printed circuit board.
A soldering station will also simplify the work, but if you wish, you can get by with just a soldering iron. The creation algorithm is easy, but good soldering skills are required.
DIY home and car amplifiers consume about 3 Volts, which allows them to be used in almost any environment.
How to improve sound differently
If the result after using the above programs turned out to be unsatisfactory, then there are several other ways to cope with the task.
First, you should check the speakers for cleanliness. If any specks or crumbs were found there, they must be removed from there, because they can have a detrimental effect on the sound of the speakers. This procedure should be carried out regularly, because... the corresponding holes quickly become clogged with dust and various debris.
Homemade speaker systems can amaze anyone. All you need to do is place your smartphone in a large glass. The difference in sound will be immediately noticeable. If you don’t have the required item at hand, you can try placing the phone near a hard surface, tilting it in the most convenient way.
You should also take into account the location of the speakers in your phone. If they are located along the bottom edge, then the gadget should be installed so that the sound is directed towards the owner for greater audibility and perception of sound waves.
As for Apple smartphones, you can increase the volume programmatically (picture below):
We have looked at only some of the effective applications available to users, by installing which you can significantly increase the volume on your smartphone.
