BL Workshop

Catch some (radio) waves




Radios might seem super high-tech. But with about $10 and one afternoon, you can make one at home.

Click here for a PDF version of these instructions.

WHAT YOU’LL NEED

  • Magnet wire: Electronics supply stores sell a set, for about $4, that comes with 40 feet of 22-gauge, 75 feet of 26-gauge and 200 feet of 30-gauge magnet wire.
  • 1 set of alligator leads with clips at each end.
  • 1 diode: Look for IN34A diodes, also called “germanium diodes,” at an electronics supply store.
  • 1 glue stick or anything similar in size — about 1 inch by 1 inch by 6 inches. It can be a piece of wood. It doesn’t have to be perfectly round, but using something round is easier for winding.
  • Electrical tape
  • Wire stripping pliers
  • Telephone handset with cord. If you don’t have an old phone that you don’t use anymore, you’ll need to buy a telephone cord, then borrow the headset long enough to make the radio work.
  • One board for mounting your radio — 2 feet by 2 feet will work. You can make the radio without this, but having a workspace and a place to mount the radio makes it easier to carry around while you’re looking for a place to hook the ground wire.

WHAT YOU’LL DO

Step 1 and 2Step 1: Wind 26-gauge wire (the green magnet wire) around the glue stick until it covers nearly the entire cylinder. Keep the wire tight. Leave about six inches of wire on each end. Once you’re finished winding it, tape around both ends of the cylinder to make sure the wire holds. Then, mount the coil to the board with electrical tape.

Step 2: Strip the ends of the wire you’ve left from each end of the coil. Use wire stripping pliers or sandpaper. The wire is very thin. Removing the enamel and exposing about one inch of the wire should be easy.

Steps 3, 4 and 5Step 3: Attach the wire from the right side of the coil to one end of your diode. Tape the connection.

Step 4: Cut the end of the phone cord and strip about two inches of it. It should expose two wires. Strip those wires. Take your time; this wire is thin. (Try this tip: Before hooking up the tiny telephone cord wires, get some thicker insulated magnet wire and tape about two inches to each wire. This will make the rest of the job easier.) Attach one end of the wire to the exposed end of the diode. Tape that connection.

If your phone cord has four wires instead of two, you have to figure out which two will work. Take a 9-volt battery and place one cord against the positive (+) pole of the battery and another cord on the negative (-). When you find a combination that makes a clicking sound in the headset, you have found the two wires to use.

Step 5: Connect the second telephone wire to the green wire coming from the left side of the coil. Before taping this connection, clip one of the alligator leads to it. Tape those three wires together — the alligator lead (that’s your ground wire), the telephone wire and the wire coming from the left side of the coil.

Steps 6 and 7Step 6: Make your antenna by clipping one of the remaining alligator lead wires to one end of the 22-gauge magnet wire. Leave this wire on its roll.

Step 7: Scrape a thin strip of enamel from the wire wrapped around the glue stick. You can do this with any sharp object or a piece of sandpaper.

SEE IF IT WORKS

Attach your telephone cord to its handset.

Find a good ground for the alligator wire that’s connected to the left side of your coil. A pipe going into the ground is perfect.

Unroll the antenna wire and hang it over a tree branch with help from an adult.

Touch the alligator clip that leads to your antenna wire to the top of the coil. You should be able to hear an AM radio signal.

TROUBLESHOOTING

If you can’t get any signal, it’s probably your ground wire. With permission from an adult, unscrew one bolt that holds the faceplate to a light switch or outlet. Unscrew it just enough to hook your alligator clip. Don’t remove the plate.

If you get a weak signal, it’s your antenna. If your parents have an old television antenna, hook your radio antenna wire to one of the connections on the TV antenna wire instead of running wire up a tree.

Comments about “Catch some (radio) waves”

  1. fm lover says:

    how do you get fm stations

  2. Rman7 says:

    I can’t get mine to work. I have looked over the instructions a million times and can figure out what I did wrong. I have the exact same materials as the instructions, and my wires are all connected to the right spot. I live on a farm, but I don’t think I am too far away to receive radio waves. I hear a noise in the headset, but no radio stations. Please Help Me!!!!!!!!!

  3. taz says:

    it realy works thats awsesome!!!

  4. Meggie says:

    THAT LOOKS COOL

  5. freeback says:

    THAT IS AWSOME! I’m going to try it!

  6. legomaster says:

    I wonder if you can shirnk it and put it in a kart? Also, if you can get a sattlite dish(sorry, bad grammer) theat would be cool!!

  7. justinator says:

    cool, It sounds cool I’ll try it

  8. Samson the Lake Trout says:

    This radio receiver that is built using a glue stick and some 26 guage wire and 22 gauge wire is a great school science fair project and also good for a merit badge. Does this radio receiver only receive one frequency of radio broadcasts or will it receive multiple frequencies when adding a metal paper clip radio tuner that comes into contact with the 26 guage wire? It’s great to listen to radio broadcasts with this type of receiver who announce their Federal Communications Commission Letter Identifications who broadcast over a specified geographical area in accordance to any particular FCC radio broadcast license grade (such as grade A,B, C, and so forth). Sometimes the radio broadcasts received on this radio will announce that the radio station is either W,_,_,_, or K,_,_,_. Thanks for a great school science fair project idea.

    • OldScout says:

      added note…when the call letters of a radio station start with the letter W that means the station is East of the Mississippi River. If it starts with K then the station is west of the Mississippi River.

  9. archer flame yoshi says:

    cool and not very expensive, realy works too!!!, but i havent had time to do it…YET.

  10. Samonerd says:

    That is AWESOMMMEE!!!!! That is like one of the coolest things that i would be able to make!

  11. lobstapenguinman says:

    my dads a lobsterman and has a radio on his boat possibly i could call him

  12. kj says:

    i think this game is great

  13. fred fred burger says:

    I love to make stuff that is usefull and fun

  14. I says:

    This is cool, it reminds me of the war.

  15. Im a ninja says:

    i made this for my science fair project and it worked!

  16. Timmy says:

    Wow! What frequencies can you get?

  17. 148100148 says:

    sounds asome

  18. studeahlic says:

    I made one nearly like this while in the cub scouts (crystal set) some time in 1948. I still remember the 1st time I heard it play (Gene Autry show) some fifty nine years ago. thanks for the memory, DON

  19. Taco94 says:

    I’m really interested in Ham radio and plan to get my liscense so I think that this will help me.

  20. the matster says:

    sounds really cool and fun definatly want to try it some time

  21. starfreak says:

    Can u get FM?

  22. SuperToad says:

    put one in the bushes, call your sister over, then turn it on. she’ll be scared out of hir wits! lol!

  23. corky says:

    sounds like fun :

  24. Derrick, Age 10, Florida says:

    There was a project like this on display at my school science fair last year (4th grade) and I thought it looked really cool. I think I might try making this projcet myself and it would be neat to show my friends what it was like. The only problem with this project is that it sounds kind of tricky. Then again, my dad will probably agree to help me. :)

  25. sean says:

    ben if your reading this they have foxhole radios during WWII simply a razor blade and a pencail with a10ft long pecice of wire and a headphones you rub the pencail over the razor blade and here a buzzing sound

  26. speed297 says:

    sounds hard,but I’m going to try it

  27. mr ed says:

    i think radios are nice

  28. turtle says:

    i like radios

  29. ben says:

    its impossel to find a simpler radio

  30. Nutin says:

    I think it will be cheap easy and fun

  31. bacon says:

    i think ill try but i dont think it will be easy

  32. cook me says:

    challenging but cooooooooooooooooool !

  33. billygoat5-40 says:

    I try this how does it work

  34. 50cent says:

    I don’t like am radio isn’t there away to make fm radio????? =P

  35. 50cent says:

    very cool, i like istening to the radio so it will be fun i will teach my friends

  36. radioman says:

    this is soooooooooo cool

  37. raidoman says:

    i like this project. i am going to try it later.

  38. a says:

    interesting…..yet complicated

  39. jonathan3 says:

    can you do it on the computer

  40. cobalt says:

    confusing

  41. moldy cheez says:

    i already know how to make a shortwave radio

  42. kongfu master says:

    how weird but i will try to make it.

  43. Cajundweeb says:

    Never thought about using an old telephone handset as an earpiece. Good to know!

  44. Eli says:

    I might already have the stuff to make it. The only problem is I have to find it…..

  45. jlcusmc says:

    do i really have to do this

  46. SKUPSKUP says:

    COOL!!!!!!!

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