In certain times of need, phones may prove unreliable and television may be down for an indefinite period of time, but your old TV can still prove its reliability. You will still be able to find out what is currently happening around the city, or in the country if you convert it into a radio and find the right frequency, which other people or the authorities use, as well.
Creating your own radio is useful if considering another point of view: you do not need authorisation from the FCC and you will not spend money, since all the necessary parts are already provided by your old TV set. So, start dismantling it.
What we will talk about is how to build a radio transmitter, which can go a really long way as to convey information across vast lands or oceans. What a radio transmitter will do is produce a wave of discontinuous current that you can convert into sound, by controlling the height of that particular wave.
Apart from sending information away, you will also need to receive it, in which case you will have to “insulate” the signal you receive, the sound, the information that comes back to you.
The first step consists in recreating the antenna of your improvised radio. The bigger it is, the more it will capture the radio signal. Use the TV wires to do so. I’ve included detailed instructions on this matter in this article, here.
After doing that, you will need to detect and recreate the same frequency of the radio carrier wave. Start making a regulated circuit for that end. Your TV should have, just like any other TV, a garment concealing the wire magnet. Remove that wire and twist it whilst using a nonconductive platform (such as plastic bottles). Sandpaper the points generating the power; then, assemble a detachable adapter. In order to match the frequency you need, you will have to adjust the level of stretch of the springs, which you can accomplish by altering the connection points.
Couple the curl wire with an adaptable electrostatically condenser (or capacitor). You can do that yourself by using aluminum foil and paper; the latter fortifies the reception of the condenser. Your old TV set will also provide you with a diode, which the circuit you have just created definitely benefits from having, as it helps convert the carrier surge into current. Do not forget about grounding your circuit.
You have dealt with the reception and the transmission of the sounds. You are now done with the back-end technicalities, but you’re still unable to hear. Using an alarm clock timer will solve the problem, but the trick is that you would need to listen to your radio in a quiet environment, otherwise you will not hear a thing. You can also replace the beeper with anything that you consider to be more suitable.
Do you have an old TV set just lying around? Let me know how your project went in the comments section below.