Toy Organ
Once we are used to work with VCOs we are going to design a small organ. The idea is to provide to the VCO an interface of buttons in order to connect capacitors dynamicly. When you push a button you add a new capacitor to the circuit and you modify the final frequency of the sound.
Schematic:
You can see a NE555 timer in aestable mode and the capacitors interface made with buttons.
In this case you can also use a potentiometer or a trimmer to change the frequency dynamicly. The idea is such that you choose the range of frequencies with the buttons and you play small changes and interferencies with thew trimmer or potentiometer.
As always, you have two more pin headers for input and output:
- The one on the top is for output. Pin 1 is connected to +5 volts, pin 2 is the output signal, pins 3 and 4 are connected to ground.
- The one that is below is for input. Pin 1 is connected to +5 volts, 2 is isolated, 3 and 4 are connected to ground.
Photos:
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