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DIY PROJECT TO MAKE A PLAYABLE MINI-BANJO 2 STRING 2 OCTAVES FOR KIDS.
This two day project is very similar to but not identical to the Instructable "Mini-Uk 1-14-2010.
You can use the Ukkulele information for stringing and  tuning ,etc.

Step 1: MATERIALS

MATERIALS  -
Same  type materials and tools as shown in the Ukulele Instructable; You can substitute other wood for the neck . I used Oak found in the Decorative timber of Home Depot. It is already to use.
The frets were split wood coffee stirrers  .05 inches thick. Some  people  use no frets at all.
Resonator chamber happened to be a dog food container but any round case could be used.The material is aluminum and esy to use. See figure Construction for details.
   Amplifier- Dollar store earphones 1 in. diameter 32 ohms are very sensitive and save  a bundle of money.. Feed into Radio Shack  pre-amplifier/speaker [about  $12.00] This can feed into your major amplifier or a i-pod stereo amplifer now sold for  under $5.00 in some  stores.

Step 2: CONSTRUCTION

Consstruction-
Attaching the neck wood to the case; Mark off the location where the neck meets the case at the top. Punch 6 holes with an awl in the case . This will give  double the strength when the glue [Goop ] is added here . Let the two parts  cure for at least 4 hours
. String feed - Use an awl to punch two small holes in the top where the Polymeric elastic strings will feed through. The strings  will be notes B and D just below and above Piano middle C. Pull strings through the holes and twange them  untill they sound close to but lower than the final desired note.
Final tuning is done with the screw eyes at the  neck top. Then add a bead crimp and use long nose plier to squeeze bead closed to the metal case inside of the case.

Step 3: TESTING

After completion of  the instrument-
Frets may be used . If so - you can use fret location the mathematical way or my way which I find easier. Use a tuning  devise or in my case a cheap Casio type 3 octave keyboard..

Tune  B note  then next hit Cmiddle note and place a finger on the string and find the C note sounding like the casio. Mark with a pencil for fret one. Continue like this with all naturals and sharps.[Kids may not like to use sharps so you could leave out sharp frets.
 Repeat for the next string D note. D# , etc. till you cover at least two octaves for the  banjo.
    Sit the unit aside for 2 Hours- The note B and D will drift  down to a lower note- Retune each string to B and D.  This drift effect will occur for at least 3 tune-ups  in 6 hours.Drift is under a half -note so your  player will note practically no noticable drift.  After a couple of retunes   you can then disregard the minor drift.

Step 4: AMPLIFICATION

Amplification can be used as stated above. I used  some old earphones  of the dynamic type  8 to 32 ohms  and with stereo cord attached.Dollar stores have these for a buck and work as good as the high-priced  microphones  now on the market. Ear bud phones work too. Feed into a 1mvolt sensitivity pre-amplifier  and then into your stereo system or any old amplifier. I use an old PC speaker /amplifier system  with a powerful two- watts output.   See figure.

Glue the ear phones  to the inside of the case or outside and inside  if you wish to use both ear pieces. Use silicone rubber tub seal adhesive in case you need to remove later.
The pre-amp is Mono-input so use a stereo to mono adaptor here[Dollar store $1.00].Same for output.
thanks, try the Lyre- its fun to play too.
Rock on! I love musical instructables.
&nbsp;This can be a nice gift. Do you sell your gadgets?<br /> <br /> -Not for me, I live in Argentina-<br />
hello r2000- i do not sell the final gadget only the plans- however&nbsp;&nbsp; these plans are free in Instructables&nbsp; for the world to try. I did sell my wooden robots years ago when I was a wood carver . People who make&nbsp; these items&nbsp; sometime ask me to help out via the comment&nbsp; section here.<br />

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Bio: A retired electronics engineer -motorola. delveing into new craft ideas and contest entries.
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