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Crystal Radios. A blast from the past!

Many of us have looked at, or even built a crystal radio set at some point in our lives. Maybe it was in our Scouting days, youth group, science class, science fair… or just to DO IT!  The circuit itself is relatively simple to wire-up.  A long piece of wire acts like an antenna.  Some configuration of earphones or speaker will let you listen to signals.  And believe it or not, the signals are all around you!  The local AM radio station should be easy to hear.  You can even build a simple pre-amp (pre-amplifier) circuit to boost the incoming signal to add extra volume and signal strength to the fun.

Let’s understand WHY a crystal radio set is sooooooo cool!  SIMPLE CIRCUIT DESIGN.  EVEN KIDS CAN DO IT!  EASY TO GET PARTS.  NO EXTERNAL POWER REQUIRED.  INTERCEPTING INVISIBLE RADIO WAVES THAT ARE ALL AROUND US.  Plus, it’s just a pile of fun!

Here is a YouTube video from WonderstruckHow who teaches us to build a very rudimentary crystal radio set with parts that are easy enough to scrounge up.

After you watch the video check out the picture gallery of all sorts of crystal radio sets that can be built in just a short time.  They are great for kids working on a science fair project (and sure beats out a terrarium!)  Some of us “Seasoned Citizens” might actually remember the paper towel tubes or Quaker Oat cardboard cans we wound the magnet wire around and even some of the commercial kits sitting under our Christmas tree!

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