![]() ![]() Which D1 act as protect external voltage backward to IC1 We will take it to controlled IC2 and IC3 again, by diode D1 and VR1 to pin 5 of both IC. This high and low voltage from pin 3 of IC1. This times is controlled by R1, R2 and C1, C2 – First, the high voltage is shown at pin 3 until the full time (about 2 seconds), Then switch to the low voltage automatically. When press switch S1 to apply power to this project. In Figure 1 the schematic diagram of this project. But some times it is hard to find, so this circuit is suitable for everyone. Although at present we use Microcontroller IC because small. This is a donkey sound effect project that easy to builds because use simple components include three IC-555 and LM386 and more little parts. Have fun electronics! Donkey sound effect project Then, we can buy it in all the common stores, right? This circuit required an 8 ohms small-sized loudspeaker. They can give tone sweet sound.Īlso, we adjust VR1 to control sound as want. ![]() The Frequencies are high and low origin alternates. ![]() In the circuit above, we use 2 IC sections. ![]() It is a highly popular number: NE555 or LM555. For sound origin Metronome, strange music is good.įirst, we use the integrated circuit timer. ![]()
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