Sunday, March 31, 2019

4G Signal booster / amplifier circuit using LM386

This is just an experiment to test if it is possible to amplify / boost 4G signal for the HuaWei-E5577 modem so that i can enjoy decent internet speed consistently. The circuit is very simple driven by LM386 amplifier IC and two antenna. One is the receiver antenna another the transmitter antenna powered by 5 Volt USB PC usb power supply.

The complete component is as follow

1 x project box for casing
1 x 4700 uF Electrolyte capacitor
1 x 1000 uF Electrolyte capacitor
2 x 4.7K Resistors
2 x Antennas with SMA male connectors
1 x USB female port
2 x SMA female connectors



The output of the result is very interesting - although there is no sign of signal indicator increase on the Huawei-E5577 modem but the internet connection looks faster than usual and it is very consistent. Despite of having 1 bar 4G signal the internet still capable of loading YouTube videos very smoothly and serve the internet normally. 

I understand that this amplifier is not capable of delivering 4G signal but the RF amplification via the LM386 seems to have effect on the HuaWei-E5577 modem. Noted that the amplification doesn't seem to work on normal smart phone device. Not sure what exactly the cause.

Anyway now i can enjoy consistent internet speed that have been poor for the past 9 years. It's different this time.

NOTE: Some people may not believe this works - but please take be reminded i do not post something that doesn't work. And at the very least it works for me.









4G Amplifier / booster circuit schematic diagram



68 comments:

  1. IMHO it is better of you provide the gain chart. Thanks

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    Replies
    1. Yeah its true but its unfortunate sometimes not all can afford the tools to measure the gain, signal etc. But all i can tell is that it work's

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  2. Which voltage i have to choose for capacitor?

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    Replies
    1. use around 16 v or 25 v is good enough...don't go less because the LM386 only use 5 volt to 9 volt...u can you high voltage cap but not efficient

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    2. i made it recently and found that it works only in 20cm radius...this is not for physical use so dont waste your time and money....thanks.

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    3. I don't believe this is a waste of money...the cost of the project probably less than $5 not only it gives you the idea to make larger thing you will learn something from it

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  3. can you provide me 100% working 3g network booster circuit diagram?

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  4. Kitna voltage ka capcitar ka use karna parega Kya yah 4g network par work karga

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    Replies
    1. I don't speak indian sorry...i live in the land of Borneo

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    2. He just asking about which voltage of capacitor he can use to get the 4G network.

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    3. Search for tank circuit a combination of capacitor and resistor in parallel.. The voltage of capacitor for high frequency doesn't need to be so high for electrolyte polarized can be 15 volt or the ceramic 50volt is fine

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  5. LM386 working well until 100khz and not 1 GHZ or more So i wondering that u posted

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    1. That actually early experiment if anything within lower frequency transmission can have effect to the 2.6 Ghz 4G signal. Now the circuit has been dismantled and replaced with another one...research still in progress

      The tools i am lacking is the absent of measuring tools like UHF frequency counter or oscilloscope. That really greatly affect the work there is nothing to measure the frequency output.

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    2. Sir,where is the voltage of this project please reply me clearly...it's not clear for me what pin of the IC did i put voltage supply.l am very interested in this circuit sir, because I leave in the rural area...thank you very much

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    3. Hi thank you for your interest it is powered by USB - so it's actually always 5 volt you can easily have that amount of power either by battery or by usb power supply from your pc or smartphone adapter

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  6. You can try a mar-6 rfic IC instead off lm386 that is for audio frecuency

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  7. dear in circuit diagram only one resistor show. where put 2nd resistor? 4.7k.
    2nd where you connect 2nd wire of antenna.?

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    Replies
    1. connect to pin no.3 and pin no.3 connect to antenna

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    2. dear in this picture 2 wire connect with both antenna. black and silver wire. i ask about black wire.

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    3. Oh the black is connect to ground (negative) and silver connect output

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    4. whire I give power supply in the ic pin?pls giive pin no + & -

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    5. Please tell about capacitors voltage rating and where we have to placed the 2resistor and send total circuit details

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    6. 10v capacitor with capacitance of 100uF is fine..but your question about 2 resistor i dont understand?

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  8. Can you make video for this booster if u can

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    Replies
    1. Yeah sure but wait i get a measuring equipment to measure the signsl gain

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  9. Any changes on the antennas to increase working radius? It is found to be useful under 50cm radius.

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  10. where second resistor connect??

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  11. Use in 35v \4700uf cap no problem?

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    Replies
    1. How to prove the circuit is working?

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    2. I dont have the equipment but you can go to a place where signal is really low and test with that signal booster if your phone is getting good signal than its working

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  12. You might be getting other band frequency. One bar from stronger band still gives you much more speed. BTW have you got this with phones ???. Even putting phone too close to the output antenna... Thanks

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    Replies
    1. You could try solder it to 3.5mm jack and plug it directly to your phone on the 3.5mm headphone port

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  13. Sir where to fix the 2 resistors 4.7k in YouTube it's shows only 1 resistors u fix and another where to fix?

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    Replies
    1. Apologize for the diagram you can actually connect the other 4.7k resistor between pin no.3 and the antenna. Hopefully that works for your cell phone booster project

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    2. Sir this supports 2100 mhz frequency for 4g .and can i use for 12 v power supply for high frequency? what are the component to change?

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    3. And sir where to connect the + and - battery?

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    4. It seems you are very new to electronic but it's a great learning experience for ya...

      vs or vcc is positive and label on pin 6 of the LM386 as shoown on the circuit diagram

      ground is negative and it is label on pin no.4 of the lm386

      Wish you the best of luck with your 2G / 3G / 4G signal booster project

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    5. Regarding your 12 volt power supply is not necessary in fact most high frequency devices only require 3.3 volts ...despite of using battery where it will drain easily i would suggest you to use 5 volt USB where you can use it any time as long as you have electricity in place.

      To boost 2100 Mhz frequency sometimes is not about getting the same frequency but to be able to push the signal (data) faster..if you are using an antenna only to boost your cell phone or mobile internet signal it will become very sensitive to position when the signal is really low. Meaning that when you move the antenna or something like wind shake the antenna it will disturb the signal because it is too low.

      So the function of the booster is to push it faster. Despite of low signal but when it goes through the booster it will push the data (in this example internet data) faster to load.

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    6. Wow thanku so much sir u says all very helpful to me thanks for explaining.
      Do more projects...

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  14. What if i am making anteena using copper coils, how many turns i should give to anteena for input and output for getting an amplified and boosted signal for 3g/2g/4g network. Can you help me out with this fast, please

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    Replies
    1. Coil won't be anygood but there is one antenna that is proven of the years that provide a good reception to 2G / 3G and 4G network it is called Yagi Antenna. To make it will take time but you could buy it from china cost only few dollars like $5 to $10...This will be the ultimate antenna to use in network.

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  15. hello sir , how long distance it will cover ??? I need a booster circuit which will cover 10m . please help me i need it. cz i live in a remote area . mobile is only way to communicate . thank you

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  16. yagi antenna may help you...please search how to make yagi antenna or you can buy from china cheap

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  17. can you make a movie to explained how it work.
    thank you

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  18. Dear sir LM386 we can used also audio amplifier ic ,but here we used as RF network booster .
    So can I use another hi power audio amp ic used like a network booster for larger area coverage... ?

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  19. Sir desine keya pr not working
    .
    I give power supply through 1.5 volt pencil cell.used 03 cell in series. Total volt is 4.5 v

    ReplyDelete
    Replies
    1. Which circuit are you trying now? is it the BFG591 or the LM386? if the LM386 4.5 volt is not enough -- you need 5 volt or at least 5.3 volt...use your usb power adapter

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  20. Lm386 is low frequency ic chip not work in SHF or UHF range
    I see these is mistake

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  21. The better version of the 4G signal amplifier circuit can be found on this video DIY homeMade 4G LTE, 3G, HSDPA, Edge, gprs, internet booster it works 95% constant signal and it is place inhouse (my room). Despite most of the service provider tower are far and my room is kind of behind blocked by walls and trees it still work like a charm. This is almost the final version of the 4G signal booster to amplified Huawei e5377 signal.

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  22. Can I use ( 2k registor or 470uf capacitor) ?

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    Replies
    1. Yes you can but a recommended if you could use lower capacitance for the capacitor like 100uF or less

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  23. Can it possible to use?
    1. 2k registor
    2. 470uf/10v capacitor
    3. 100uf/25v capacitor

    my important part is registor.
    is it possible to use 2k and 9k registor ?

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  24. Can I use (3.27K Registor Between PIN NO (2-3) ) ?

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    Replies
    1. Yup you could experiment that if u have variable resistor would be good to adjust the resistance according to your preference

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  25. Power 12 mhz crystal oscillator using transistor BC547

    The application of crystal oscillator usually in electronic devices that require frequency - for example the use of crystal oscillator in microcontroller simply to generate frequency for the processor. Other application of crystal oscillator can be found in devices like Television, radio, satellite, walkie talkie, radar jammer, radar, mobile phone, network switches, network modem etc.

    The advantage of crystal oscillator is its ability to generate precised fix frequency.

    Crystal oscillator comes with many frequency variation and there are fixed from hertz to megahertz range. In radio application usually up to kilohertz range like 32 kilohertz while modem and switches use up to megahertz like 12 Mhz, 16 Mhz, 24mhz, 48 mhz, 56 mhz, 124 mhz, 300 mhz.

    Gigahertz range use by high tech sophisticated equipment such as satellite and military.

    The design of crystal oscillator actually quite simple - as it consist of quartz crystal which vibrate back and forth (oscillate) and some IC or transistor to drive the oscillation. In high frequency oscillation usually use high speed RF transistors or integrated circuit. The two legged crystal cannot be powered alone and must be help by the driver circuit usually transistor or IC. While the 4 legged crystal oscillator can function without a circuit because as in comes with crystal and built-in ic driver inside the casing.

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  26. Your project is awesome sir please do interesting experiment I am very glad to see your effort it is very helpful for me for my knowledge.
    mobile signal booster in delhi

    ReplyDelete
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    ReplyDelete
  28. Please can I see that the back view of this circuit?

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  29. PlesPl sir I need video for this project thanks

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    Replies
    1. Yea sure will do that for you when i have the time today or tomorrow

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  30. Can u plz explain its working...!?
    Also plz upload a video on making it..

    ReplyDelete