Electronic Bagpipes - 8 tones
The Bagpipes Kit is capable of producing eight different tones from about 5kHz (5000 cycles per second) down to about 300Hz.
The MadLab electronics range is divided into beginners kits which are suitable for people with only a little practice at soldering, medium kits which require a higher level of soldering skill for people who are more experienced, and advanced kits for expert constructors and crazy experimental musician circuit benders.
Every MadLab kit includes a professionally-manufactured printed circuit board, quality electronic components and full assembly instructions. (Think Ikea - Airfix!)
To use the Bagpipes the stylus wire is moved up and down the network of resistors R1 to R8 which make up the keyboard. These resistors form a voltage divider.
The voltage at the end of the stylus therefore changes as each keyboard resistor is touched in turn. At the top of the keyboard the stylus voltage is 9 volts whereas at the bottom it is about 1 volt. A higher voltage speeds up the charging of the capacitors and produces a higher note. A lower voltage slows down the charging of the capacitors which results in a lower note.
Notice that R10 connects R9 and VR1 to ground to disable the oscillator when the stylus is not being used.
VR1 is a variable resistor to enable some tuning of the Bagpipes.