Wednesday, May 31, 2017

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



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

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

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

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

    ReplyDelete
    Replies
    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.

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

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    Replies
    1. I made that circuit but it'snot working with normal antenna

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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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  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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  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

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

      Delete

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