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MAKE A MINI-HARP FROM A PLASTIC THROWING DISC

Step 6HELPFUL NOTES

1-Pitch drift stability- All types of instrument strings whether steel or nylon,etc.,drift with time when under tension.Some are very tension sensitive. Polymeric elastomeric strings also change their vibration rate [pitch] with time. The initial drift will start right after they are in tension being noted as a negative shift of the tuned note. Thus one has to expect a drift of one note to a lower pitch which stabilizes in about 2 hours. After the initial tuning after a two hour wait the strings are again re-tuned to their nominal value. The drift will be less with each subsequent re-tune. The drifting effect is only a release of molecular tension and heat and humidity has very little effect.
When multi-strand elastomeric string is used the long term drift is very small. Drift of 1/2 note maximum is noted over a 2 month period. Problem is -suppliers are hard to find thus this is why I use solid mono-layer type string instead and need to re-tune more often.

2-Tuning screws- The only ones as described above I use is brass plated or nickel plated steel.The reason is the collar. it must be integral with the hook .It is needed to contain the string from pinching
as the screw is rotated clockwise[i.e. tuned}. Cost of 100 screws is under $4.00 in most hardware stores.
3-Tune-up - I have used my $20.00 Casio[R] . Also I can use my Chromatic harmonica . Pianos are nice too if you can lug it to your work bench.Or, you can make one of my Instructable mini- tuners,tune it at the piano and use it. Obviously my electronic tuner [$19.00] can be used but I find it cumbersome but accurate.
4-Amplification- I use a wireless mike I bought at a drugstore{Hanna Montana no less}.Works fine.
You may cut a 1in,Dia. side hole in the resonator to insert the mike tube.Tune your FM set to the noted frequency on the instruction sheet.Play as loud as you want.
5-Tuning range- I use about 2 octaves starting at Middle C of the Piano. Lower frequencies [Notes} can be constructed to Cm-1. but more room is needed or use a 12 inch disc.
6-Sharps[flats] notes are generated by applying slight finger pressure just down from the tuner screw about 1/4 inch and pluck the string.Some note bending will be noted but a 1/2 note increase is easily obtained. C note can be increase to C sharp [C#]. Extra strings for sharp notes is too involved and unlike a harp there is very little room for more strings. Bflat is actually A# .
7-Marking- notes location can be actual letters, pen markings, or as shown drawing a treble and base clef drawing. I also red ink mark my Cm string. Any color is well taken using a permanent felt tip marker. Green ink can be a G-string, etc.

I am going to submit this Istructable for the Music contest. So let me know if you can make this item.
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3 comments
Mar 11, 2011. 7:33 AMspark master says:
nifty item, there was once on the web a gent who listened to singing telephone poles. He rigged up a resonator (think string and cup) sort like your resonators and used it to listen to and record the vibrations we do not hear coming off phone poles . I lost the url and the saved copies of his pages , so any clue how to do that one and or have you ever seen the pages, or anyone else out there.please post back .

thanks (he called them singing telephone poles, I tried google many ways plus other search engines but no go)

thanks
sparkie
Mar 11, 2011. 12:26 PMspark master says:
the gent made "speakers" using cups or tin cans (don't remember). I thought this was very cool but had no time to do it. I lost his url's and the way back machine can't locate it. IT IS OUT THERE (oouuuhh how Xfiles), but I know not where. I think I know how to do it but am not sure . It has interesting applications for other things shown here on instructables. If you google "singing telephone poles" you get everything but his page/site.

sparkie

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