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    This cable tv amplifier circuit is a rf amplifier designed to be quickly installed between two coaxial cables. Both input and output impedances are compatible with 75 Ω cables. The main amplifier si T1 transistor, T2 is working as an emitter follower. The feedback bias is determined by R3 and R4.
    The total gain of this tv cable amplifier is 22dB.

    Because of the high frequency limit of transistors (<= 2GHz) the tv amplifier works well up to 150 MHz. It must be housed in a metal case and the coaxial cables must de 75 Ω type. The total current consumption of this tv cable amplifier circuit is around 20mA.

    Cable tv amplifier circuit schematic

    cable tv amplifier circuit schematic

    Tv amplifier active components

    • T1, T2 = 2SC4308 or 2SC1324

    2sc4308-2sc1324

    Tv cable amplifier pcb

    cable-tv-amplifier-pcb


    ask a question
    

    25 Responses to "Simple Cable TV Amplifier Circuit"

    1. it is an interesting circuit for project. i m a student in a vocatinal institute in Fiji Is. and interested in doing this circuit. please can you send the details of the purpose of each components of the circuits to my email address.

    2. i used BFW16A insted of 2SC1324.
      But it is not working properly.
      But BFW16 is real subtitute of 2SC1324.

    3. This amplifier never works. T1 is not propely biased.

      • Dr. Atti, this tv cable amplifier circuit is correct, on 100 ohms resistor will be enough voltage to apply on T1 base-emitter. Please do remember that a 0.7 V applied on base emitter will open the transistor.

    4. sir
      The transistor 2SC4308 or 2SC1324 is not available in the market in Kolkata, West Bengal, India. How can I get the transistor in kolkata, or give me the alternative transistor which I can use in the place of those transistor.
      thanking
      you
      Dhiman

    5. how can I send the 12v through the coaxil cable?

    6. how does it work? how many channels we might seen?

    7. if you dont have any experience about electronics dont try,it wont work i know!!!

    8. Eng.Faheem Ahmed says: on April 25, 2011 at 6:56 pm

      i want to tell u that i have best cable tv amplifier than this
      you will try it simply email me what you have problem i give you solution about that
      thanks

      • pls explain de circuit for me

      • shivaprasad says: on December 19, 2011 at 6:28 am

        am using cable TV in computer monitor i had connected via TV tuner box(external), but the video quality is not good. please suggest me a good amplifier circuit, for high quality audio and video

      • mughees says: on July 17, 2012 at 7:32 pm

        i want PCB layout design with the help of components …..

      • Filipino-Major says: on September 2, 2014 at 2:58 pm

        sir please mail me your cable tv amplifier

      • jagadeesan says: on October 10, 2015 at 12:03 pm

        hi this is jagadeesh from cbe. wats my prob is just i want to boost the television signal and it might want to reduce the noise in television signal for a VHF television signals and LF ..so ple give me a circuit which is possible to this

    9. it doesnt work the transistors are not available7

    10. I want to catch leakage cable tv signal with the help of tv anteena and amplify them to view clear audio and video on my tv, can this circuit work properly. If any other circuit you have please puplish on your site or send me on my email address….THANKS.

    11. Info & circuit of how to get tv piture clear

    12. its amazing they have been giving problems but it will be no more. thank you so much. keep it up.

    13. madarchod Randi ka bacha log ma chudao lund kuch ni mil raha bhosdiwala chutya bana raha hai sala dogla ka aaulad

    14. Engr. Maverick Phils says: on September 2, 2014 at 3:49 pm

      this circuit is NOT WORKING !!!!

    15. Engr. Maverick Bell*** says: on September 2, 2014 at 3:52 pm

      this circuit is only for 600GHz not for PAL/NTSC required area here in earth. hahaha

    16. What I change to use this for upto 1000mhz

    17. What I change to use this for upto 600mhz

    18. can i use 100ohm resistors instead of 75ohm resistors

    19. The best sub for the 2sc1324 is the NTE 278. Works fine…Available from mcm, newark, etc… possibly local repair parts outlet. NOT RADIO SHACK, they don’t support hobbyists anymore and haven’t for a while.

      Ps:Real Tech

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