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555 simple toy electronic organ circuit

2015-01-31 06:51  
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555 simple toy electronic organ circuit
This multivibrator circuit is composed as the core of 555 time base circuit, the tone and musical note is changed by changing the on/off of the two groups of piano keyboard switch. The circuit is shown in the figure 11-37. The actable multivibrator is made of 555 and R1~R8, R9, C1, the different pronouncing frequency can be changed by changing the resistance of charge resistance, then it will emit different musical note. After R1~R8 are connected in series, the max resistance is 100kΩ, the basic frequency of graphical parameters are between 390~6420Hz, they are decided by A group's K1~K7 piano keyboard switch. When it is debugging, AN1, AN2 are off, a 100kΩ exponential type potentiometer is used to take down the resistance when the tone is 1, 2, 3...7, then relevent resistor is selected to connect into the circuit.