This is the Melody and Music tone generator circuit which I think is useful for adding color in the electronic work is good, Can be applied to sound an alarm, or assembly electronic projects very well. Examples circuit that I suggest, is a switch for adjusting the sound more, it is not boring, these circuits are suitable for the toys in time for the children, or parents who want to add electronics skills to children.
Western Music Circuit using HT82207
Sounds that you heard in the movie, which is fighting the cowboy, the gun sounds, sound horse this cycle is to be born.Because the IC has already been programmed to be easy to use.
Principle of the circuit is.When the circuit to the power supply. Then try pressing the switch S1 will allow the production of IC1 frequency out of pin 17.
In addition to Q1 amplifier IC1 is often the birth up to the control stick – off of LED1, LED2. The R1, R2 are connected to eliminate the current flowing through LED 2 and the C1 and C2 are responsible for filtering unwanted noise away. In addition, VR1 can also determine the speed of sound heard.
Western Music Melody Circuit using HT82207
Melody Generator using UM3491
Operation of the circuit IC1 No. UM3491 structures within the memory ROM are then became the sound And the chorus. Memory controller is a 10 bit scale code is set to a music major and 5 bit control scale code which sets the second chorus.
The R1 is connected to the pin 11 and pin 12 to determine the origin frequency oscillator frequency of 64 Hz rhythm and melody sound. Signals that are sent to the Circuit Envelop by the legs 12, 14 are C1, C2 is connected with the signal from the circuit Envelop will come out of stand 13.
With C3 is coupling signal before entering the leg 15 to modulate circuit as a signal audio output to pin 17 which is connected to Q1 which acts amplifier if the press switch S1 will make IC1 to play a song and then stop if the press switch S1 also a time IC1 will play the next song and then stop the S2-S4. determines the nature of the music to be played.
Animal Sound Generator Circuit using HT82231
This is an animal origin, a simple circuit. Interesting, because an IC package and a simple good.
Operation of the circuit. This circuit, an IC, a number HT82231 IC package that has other audio source animals. The origin of the sound depends on the switch S1-S8 of switch.
Each is a different animal sounds and choose to press each LED1, LED2 lights alternately as it sounds they hear. The R1, R2 LED forward current limiting for each signal will come out on pin 19, to expand the force with Q1. There is also a sound that VR1 can be adjusted as soon as we hear. Or slow as you like C1, C2 prevents low-frequency noise. And high frequencies.
Six Sound generator circuit using MM5837
This is a simple Six sound effect generator using MM5837 that imitate the sound of water and wind in nature. At least 6 sounds by changing capacitance only.
We use IC-MM5837 as an important device. So powerful. And the budget.
For example, six sound effects are:
1. Rain on the metal roof.
3. The wind in the forest.
4. sounds turbulent flow river
6. Sea waves crashing to shore.
How it works
The above circuit include importance components is IC1-MM5837 as a digital noise source IC.
But is modified by insert the proper capacitor unless a sound output like the sound water and Wind in nature.
The connecting circuit is easy. The sound signal from IC1 will be sent out of pin 3 through either C2 or C7 to the ground. To set the various sound.
Figure 1 the Six sound effect generators using MM5837
While the signal through R1 to coupling signal to amplify at IC 2 that power up to 1 watt.
The VR1 is volume to adjust the sound low – high as we like.
Then, the signal is amplified will out of pin 5 of IC2 and after that, coupling through capacitor-C10 out of the speaker.
The R3 and C11 will filter high frequency to the ground to reduce the noise signal that do not need.
Because of determine sounds depends on the value of the C2-C7. By using six switches (should use the normally open push button switch or DIP switch as figure 2) to select the each capacitors.
Which we can control the sound out Continuous like the actual condition of the sound. And when push switch simultaneously to more than one.
Like adding capacitance It makes a different sound.
The capacitance of C2-C7 is set from less to much Can be changed to other values. It can be unlimited. Can be changed to a higher value to 1000uF or more.
How to builds
This project is easy to build. we can put all components on to the universal PCB We must look out carefully for is the polarity of electrolytic capacitors and Diodes correctly. Pin of the IC is not an error.
Sound effect using LM324
The components list
Resistors ¼W +5%
R3: 10 ohm
C1, C7: 100uF__25V, Electrolytic
C2: 0.01uF__63V, Polyester
C3, C8, C9, C11: 0.1uF 63V, Polyester
C4: 1uF 25V, Electrolytic
C5: 4.7uF__25V, Electrolytic
C6: 10uF__25V, Electrolytic
C10: 220uF_25V, Electrolytic
IC1: MM5837 Digital Noise Source
IC2: LM386 _Low voltage amplifier
Speaker 4 ohm 1W
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