Many Electronic circuit projects in simple ways of learning

555 Sound effect generator circuit

If we want to be a producer,This circuit would be a good starting point to composed music for 1000 tracks.

As Figure 1 is a common circuit. Which will see them always when use LED running. We will use an IC-555 timer and IC-4017 Decade Counter Divider with 10 Decoded as sound effect generator with adjusting tone music with a tempo slow – fast as you want it to VR11. And VR1-VR10 to adjust the tone according to need more than 1000 tone.

Simple sound effect generator circuit using IC-555 and IC-4017

Figure 1 is the simple sound effect generator circuit using IC-555 and IC-4017

This circuit can be used as an various alarms. We will see that use a lot of a variable resistors or potentiometers. But it’s better than using a fixed value resistor then got bored listening to only 2-3 times. The value of VR1-VR10 will use no more than 100K. Because if it more than this will cause IC3 generate the frequency is lower than 100Hz which we will listen don’t as music.

Donkey sound effect project

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. Although at present we use Micro controller IC because small. But some times it is hard to find, so this circuit is suitable for everyone.

How it works

In Figure 1 the schematic diagram of this projects.

555 Donkey sound generator circuit

When press switch S1 to apply power to this project. The operation of IC1 will be 2 ranges.
– First the high voltage is shown at pin 3 until full time (about 2 second), Then switch to the low voltage automatically. This times is controlled by R1,R2 and C1, C2

This high and low voltage from pin 3 of IC1. We will take it to controlled IC2 and IC3 again, by through diode D1 and VR1 to pin 5 of both IC. Which D1 act as protect external voltage backward to IC1

While IC2 and IC3 are connected to others parts that controlled it generate the high and low frequency as voltage from pin 5.


If high voltage IC will generate high frequency and if low voltage the frequency is low.

Both IC2 and IC3 same work. Because we want realistic sound, Create a two frequency range with a frequency similar to simultaneously make it sound like a chorus.

The IC4 acts amplifier IC2 and IC3 frequency of the speaker, the VR3 as a control signal voltage level before expanding.

Parts you will need

Resistors 0.25W 5%
R1: 100K
R2: 6.8M
R3, R4, R6: 10K
R5: 270 ohms
R7: 27K
R8: 27 ohms
Electrolytic Capacitors
C4,C7: 10uF 16V
C8: 220uF 16V

Mylar capacitors
C1,C2: 0.22uF 50V
C3: 0.056uF 50V
C5: 0.047uF 50V
C6: 0.047uF 50V

Variable Resistors
VR1,VR2: 4.7K
VR3: 100K

Semiconductors
IC1, IC2, IC3: NE555 Timer
IC4: LM386 Amplifiers

SP1- 8 ohms speaker
PCB and more

How to builds

First you need to make a PCB as Figure 2 then assemble all parts on it as Figure 3 , next connect more wire and speaker. Next check for error. Then apply power to the circuit.

PCB layout
Figure 2 the PCB layout

the components layout
Figure 3 the components layout

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This Post Has One Comment

  1. i need sound card ta accept separate signals “waves” and display them separate on computer monitor. I am using Mixpad software

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