Cable TV amplifier

Posted on Feb 6, 2014

This is a very simple cable TV amplifier using two transistors. This amplifier circuit is most suitable for cable TV systems using 75 Ohm coaxial cables and works fine up to 150MHz. Transistor T1 performs the job of amplification. Up to 20dB gain can be expected from the circuit. T2 is wired as an emitter follower to increase current gain. Hi Chary

Cable TV amplifier
Click here to download the full size of the above Circuit.

try using 2SC2570 for both the transistors. You can find the difference in the noisey channels both in audio and video or atleast in audio (the frying noise with audio will get reduced). Finally you may try a 6 turns close wound air core coil of 6mm dia with 18 SWG super enameled copper wire, between C2, R5 junction and ground. I cant getting any changes in quality of picture, and I am using Transformer with rectifier and capacitor for providing 12v supply. please solve my problem, I wanted to ask whelther this circuit would be ideal to amplify wifi signals around 2. 4 to 2. 5 Ghz. I was working on a project in which i have to spread my wifi signals in 10km radius, i can use this circuit in series to amplify signal many many times, ill use atleast 15 of these circuits in series Actually, I have a Television and Computer TV Card in my home. When My dad watch TV, then my TV Card display poor quality Picture. Otherwise it is good. May be it is happennig for less line gain when running two sets (Television+TV Card).

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