Build Your Own Crystal Radio

Kit Contents

 1 1N34A germanium diode
 1 120 picofarad ceramic disc capacitor
 1 82kΩ, 5% ¼-watt carbon resistor
 1 Ceramic earphone
 1 150 feet 22 AWG enamel-coated magnet wire
 1 Cardboard tube, 2 ⅛ inches diameter, 4 inches long
 4 #6 nickel-plated Fahnestock clips
 7 #6 x ½ inch screws
 1 #6 washer
 1 #8 x ¾ inch screw
 2 #8 washers
 1 ⅛ inch inner diameter black plastic knob
 1 Brass rod, ⅛ inch diameter, 7 inch long
 1 Mono audio cable
 1 Mini audio amplifier
 1 Wooden mounting board
 1 2" square sandpaper, fine grit

Printed instructions are not included with the science kit. Project directions are available online.

You will also need from home:
- Philips head screwdriver
- Metal grounding rod; this can be an exposed metal water pipe, metal fence, or a 3 foot length of copper pipe from the hardware store
- Plastic zip ties
- Wire cutters or a strong pair of scissors
- Double sided tape
- 9V battery
- Masking tape
- Permanent marker
- Access to a yard, park, or other open space

Build Your Own Crystal Radio

Price: $69.95
Our staff scientists worked long and hard to develop a crystal radio kit that will make your project successful and avoid the many problems of the “toy store” crystal radios. You will learn the basic circuit elements required for receiving radio signals, and you will be able to listen to AM radio broadcasts with something you made yourself!

What makes this crystal radio different from all of the others?

  • Easy-to-understand instructions on our website, designed for beginners, with lots and lots of pictures.
  • A pre-assembled amplifier/speaker unit and connecting cable, which enables you to hear stations much, much more easily than with a little ceramic earbud. (Unfortunately, a crystal radio cannot work with a modern smartphone’s earphones.) The speaker is especially helpful when testing the radio. For example, you can hear whether moving the antenna improves reception while you are actually making the changes.
  • Predrilled holes, which make it easy to assemble.
  • A pre-punched coil form made from heavy cardboard tubing, not a toilet paper tube. This material will stand up to practically anything imaginable, and the pre-punched holes make it extremely easy to wind the coil.
  • Professional-quality, nickel-plated brass clips for all connections, making them secure without the need for soldering.
  • Wire for the outdoor antenna, which many others charge extra for.

Follow the detailed instructions in the Science Buddies project Build a Crystal Radio, then experiment to see how many AM stations you can receive, how far they are from your location, and the radio frequency they are broadcasting on. Learn by building a high-quality kit that gives fun results!

Note: This product is sold out for the current season and not expected to be back in stock until late summer 2015.

This product is currently out of stock   
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