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 budget.
For example six sound effect 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, a sound signal from IC1 will be send out of pin 3 through either C2 or C7 to 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 watts. 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 ground to reduce the noise signal that do not need.
Because of determine sounds depends on the value of the C2-C7. By use 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 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 ,??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 as Figure 2. We must look out carefully for is the polarity of electrolytic capacitors and Diodes correctly. Pin of the IC is not an error.
Figure 2 the components layout of this projects.
The components list.
Resistors ¼W +5%
C3, C8, C9, C11_______0.1uF__63V___Polyester
IC1__________________MM5837 Digital Noise Source
IC2__________________LM386 _Low voltage amplifier
Speaker 4 ohm 1W
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