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Musical instrument tuner using elastic string

Step 2Step 1 How it operates

step 1 How it operates
The pictured view shows the general view of a plastic box and 3 elastic strings tied at one end to the bottom and at the other end to a tuning mechanism .A similar sized box is attached to the bottom and used as a resonator amplifier if more sound volume is needed.
The plastic box should be semi-rigid. A plastic pencil box is just right to work with .Use a square of stiff, white card-board for the notes printing surface.You will need to mark the notes as you press down to sound the note,I used my Casio to sound the notes. The first string is tuned to C below middle C. Second string tuned to middle C. Third string is tuned to C above Middle C. Use the thumb nail of left hand and press string to card-board,Hit the note ona casio or harmonica,etc.D mark, E mark, etc.Pluck string with your right hand. Repete with all strings. Tuner is now complete.
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Author:mistic
A retired electronics engineer -motorola. delveing into new craft ideas and contest entries.