Have you ever tried to design a circuit
that produces sound? Here is the circuit that produces five tones. This
is a simple toy piano circuit with 555 timer. We can also use this
circuit as a Machine gun.
Toy Organ Circuit Principle:
Main heart
of this circuit is 555timer IC. The 555 timer is operated in astable
multivibrator mode. In astable multivibrator mode, the circuit produces
accurate free running waveforms, which can be adjusted.
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The
circuit consists of six 1 kohm resistors connected in series. There are
six buttons connected in the circuit. When one button is pressed it
produces a tone. Similarly, six buttons produce six different tones.
That means, it just works as a toy piano. When the first button from
right is pressed it produces high pitch tone. When the last button is
pressed it delivers a low tone. This is because of the resistance
connected to the buttons. The low thresh hold voltage obtained at the
sixth pin slows the charging and discharging of 10 micro farad capacitor
at the speaker. As the resistance value increases voltage at the
threshold pin decreases and low frequency passes through speaker.
Toy Piano Circuit Diagram:
Circuit Components:
- 555 Timer IC
- 6 Resistors – R1 to R6.
- Potentiometer – RV1
- Capacitors – C1 and C2
- Speaker of capacity 8ohms.
Toy Piano Circuit Design:
The 555 IC is a timer IC that produces frequency. 555 timer IC is operated in astable multivibrator mode.
The supply voltage VCC is 6V. Six 1k resistors are connected in series.
Second and sixth pins are shorted to allow retriggering of 555 timer IC
after every timing cycle. These two pins are grounded through a
capacitor. Fourth pin is reset pin it is shorted with eighth pin i.e.
VCC to avoid sudden resets. Seventh pin is discharge pin. It is
connected to series resistors through a variable resistor. Output is
taken from third pin. The obtained frequency is applied to the 8 ohms
speaker through a 10 microfarad capacitor.
Do you know about Stun Gun Circuit and its Applications?
Electronic Toy Organ Circuit Simulation Video:
How to Operate Toy Piano?
Initially
Power the circuit. Now press the first button from right. It produces a
tone with high pitch. Now press the second button it’s pitch is slightly
lower than the first button. Now press the next button. Likewise, press
all the buttons in order to listen the tones produced by them. This is
similar to tones produced by a piano. At a time only one button can be
pressed.
Applications of Toy Organ Circuit:
- It is used to produce different types of tones and sounds by changing the resistor values.
- We can use it as a best birthday gift for the kids.
- We can also use this circuit as a Machine gun by changing the resistor and capacitor
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some simple projects for Electrical&Electronics students