Another GI Survival radio is called the Three Penny Radio. It is a simple radio to build that is easy to conceal. It is perfect for those times when you need a simple radio but do not want it publicized that you have it. I love this design because it is simple. The only drawback to this construction is that it requires to solder some parts, this can be accomplished though through a hot fire if you do not have a soldering iron. You will still need some lead solder though.
Supplies list: 3 shiny Pennies, a tuning coil (this can be built in two ways look at the end for notes), (1) MK 484 AM Integrated Circuit, a tuning capacitor, a 100,000 ohm resistor, a 1000 ohm resistor, a 0.01 microfarad capacitor, 2 0.1 microfarad capacitors, a 1.5 volt power source.
Step #1 – Take the three pennies, and solder the MK 484 to the three pennies.
Step #4 – Next connect the 100,000 ohm resistor to the middle of the variable capacitor to the left penny.
Step #5 – Solder the 0.1 Microfarad capacitor to the top two pennies.
Step #6 – Connect the ear piece one wire to the 1000 ohm resistor and the other wire to the 0.1 Microfarad capacitor.
Step #7 – Solder the resistor to the top left penny.
Step #8 – Solder the Red (Positive Wire) to the capacitor and the black (negative) wire to the top right penny.
Step #9 – Now solder the left wire from the coil to the left leg of the capacitor and the right wire from the coil to the middle leg of the variable capacitor.
Congratulations you now have a functional Three Penny Radio.
Notes: (1) There are multiple types of coils you can create to make this radio, the most common type of coil is the ferrite coil which allows for the changing of tuning. If you choose not to make a ferrite coil you will need to create a tuner.
(2) Using a battery for the power source is great, however if you do not have a battery then you can create your own battery. There are several methods. Look at my website category Tools of the Trade to learn different methods.