Over the Air Tv Antenna Amp.

Introduction: Over the Air Tv Antenna Amp.

About: computoman.blogspot.com Bytesize articles instead of a trilogy in one post.

Wanted to give our over the air TV antennas a little boost. Came across this circuit to see if it would work. Ihave already done several instructables about antennas, though it would be nice to something a little different.

Antenna instructables: https://www.instructables.com/id/Antennas-TV-Wifi-and-etc/

Notice: This amp is for use with indoor antennas only where there is safety from lightning or other power sources. Also can not guarantee you will have the same results with your amp.

Step 1: What's Needed.

2 - NTE107 rf transistors.
5 - 100 to 120 pf capacitors
1 - 1k resistor
2 - 47k resistors
1 - 3.3k resistor
1 - 10 - 12 volt power source such as a walwart. This project shoul not use much power.
Assorted wires for connections.
1 -  Breadboard to prototype the project.

Step 2: The Circuit.

I have drawn the circuit two ways in case you wanted to use a bread board. Tried to make things simple as possible. This is a two stage map for for indoor antenna use only. There is no protection against lighting. You will need extra parts if you do. See an expert for help in that case.

Step 3: How Good Is It?

Here is where we test it out. Looks good to me! Now to make a more permanent set up.

Step 4: Alternative Circuit.

Another antenna circuit you can try on your own risk, Not promising it will work for you, but it is another antenna amp.

Going to do an experimental circuit with the second diagram and see how it works out.

Step 5: Cable Signal Amp?

Try at your own risk as I have not tested it yet. the transistors should be 123ap.

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    12 Discussions

    0
    johnb270
    johnb270

    8 months ago

    Built it,it works well.Nice basic circuit.
    I'm running the coax core through the circuit only,with the outer mesh bypassing through a jumper without being attached the amp.

    0
    jriofrio
    jriofrio

    Reply 2 months ago

    Hello there...
    Will be possible for you to draw the circuit, please.
    I'm not very knowledgeable with reading circuits and having a little trouble fowling the connections. The pictures (showing the real components in this instructable are very blurry) i can't follow the connections.
    I will really appreciated if you could please.
    thank you

    0
    JohnB620
    JohnB620

    Reply 8 weeks ago

    The drawing above the blurry,very blurry,photo shows it well,although you might want to magnify the image with ctrl +.
    The b lead of the first transistor is connected to a line of sockets that are connected together under the prototype board,so the component leads put through the holes will be connected together.There are four such lines,(with the E lead of each transistor connected to the negative power feed).So it's transistor,resistor,capacitor for left side transitor, and again for the right side.A capacitor on the left to feed the antenna input,a capactor to bridge the first pair to the second pair of circuit traces,and a third capacitor on the rightmost line to output the amplified signal.On the rightmost line of each pair is a resistor,3.3K for left pair,1K for right pair that connect to the positive power feed.The input capacitor connencts to the first resistor on left,the output capacitor is at the capacitor of the second pair on rightmost line or between the capacitor and the topmost resistor of the second pair of circuit connection lines.
    I found out this is a line amplifier,to boost signals for long cable runs,but it works well as an antenna amp.I tried different transistors and found that ge222's worked well.

    0
    LoganJ8
    LoganJ8

    4 years ago

    Is there a way to make this with adjustable gain?

    0
    mweaser
    mweaser

    4 years ago

    Do you know what the gain of this amplifier is?

    0
    ToniRose
    ToniRose

    4 years ago

    Can this circuit be used with a twin lead antenna? I just need to boost FM signal for my stereo.

    0
    Computothought
    Computothought

    Reply 4 years ago

    Not tested it yet for that.

    0
    ToniRose
    ToniRose

    4 years ago

    Can this circuit be used with a twin lead antenna? I just need to boost FM signal for my stereo.

    0
    x0oo
    x0oo

    5 years ago

    I have a TV card for computer and dish cable connected with it. but seemingly signal strength is low. pictures are not steady and sometime colorless. can i use these circuits to boost the strength of signal from dish cable?

    0
    sctirvn687
    sctirvn687

    7 years ago on Introduction

    Great project! Does this amp work for digital TV signals? Thanks.

    0
    Computothought
    Computothought

    Reply 7 years ago on Introduction

    The digital tv antenna is the same old antenna with a fancier name, Same is true of the amps. Signals are in the same way but are decoded differently in the tuner.