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The Home Made or Homebrewed Coil

This is the easiest part of the radio to build from scratch (homemade, homebrewed). The parts are easy to obtain at a variety of places.

We will use a coil close to the same coil as on the "Beginners #2" crystal radio with a few changes. The same coil on the "Beginners #2" set can be used also. This is just a little different way to roll the coil.

Materials Needed

1   Quaker Oats box (4" Diameter size)

1   100 foot spool of #24 or #22 solid plastic insulated wire  Sometimes called "bell wire"
Suppliers: Just about any hardware store. Radio Shack. Wire should be solid, not stranded. It should be copper wire and not "tinned" wire if possible. Tinned wire is OK to use, but copper wire is better. Tinned wire is copper wire that has ben "tinned" which make the wire look like it is silver on the outside of the wire (under the insulation). Stranded wire should be avoided if at all possible.

      crystal radio wire
Radio Shack #278-1215


Construction

Take the Quaker Oats container (empty of coarse) and on the open side, come up from the bottom about a 1/2" and poke two holes (careful). Poke the wire through the right hole and back through the second hole like shown below at the top. Pull about a foot of wire out. On the inside of the oats box, place a piece of tape on the wire and the two holes. This will keep the wire from slipping out.

Wrap 25 turns of wire around the oats box going up the box. At this point (25 turnes) make a "tap"in the wire. See illistration below. Roll ten more turns (total 35 turns) and make another tap. Roll 10 more turns (total 45 turns and make the last tap. Roll 10 more turns (total 55) and poke two holes next to the last turn of wire. Cut the wire off the spool of extra wire about a foot long. Poke the wire into the first hole and back out the second hole. Place a piece of tape on the inside like on the top. This will keep the wire tight on the oats box.

Go up 1/4" from the end of the first coil amd
poke two more holes and start another coil. Wrap 10 turns of wire around the oats box. Poke two holes next to the last turn of wire. Cut the wire off the spool of extra wire about a foot long. Poke the wire into the first hole and back out the second hole. Place a piece of tape on the inside like on the top. This will keep the wire tight on the oats box.

You now have your coil wound like in the illustration below .

oatsbox crystal radio




oatsbox crystalradio coil


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