This be Two tone alarm use op-amp IC number LM3900 (Quad Amplifiers) perform produce the frequency square wave 2 level , be high frequency and low then mix the sound in the end danger beep that is appropriate it has can to link up a loudspeaker with ,using power mosfet then have better use transistor [...]
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Two tone alarm with LM3900
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Analog signal selector switches
Do not waste time, choose the input method with interchangeable input cables. But press the input selector switch, as you like. Easy and cost effective alternative is Input selection switch. With features the optional four-channel signal input. and volume to Increase or decrease the signal. In the event that your power amplifier no volume. How [...]
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555 Siren sound Generator
A Sound Generator siren project, suitable for beginners. Build a simple, but widely applied. The siren sound is a sound listening to indeed impactful. Commonly used as a sounds alarms in many forms. such as a burglar alarm in the house or install in car as alert sound ask to give way on ambulance, police [...]
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The telephone pickup small amplifiers using LM358
This circuit is the telephone pickup small amplifiers for To expand the voice conversation louder. or intercepted phone call. It use pickup telephone and LM358 op-amp IC as preamplifier and LM386 out to speaker and use 9V battery Low power consumption. The working principle The complete circuit of the The telephone pickup amplifier is shown [...]
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Easily create stereo sound 3D.
This is a create special stereo sound circuits. Which sound is a dimension to the listening. Using the some low frequency to appear out the left and right continuously. Interspersed with master frequency. By signal frequency is mono system passed through this circuit. The low signal frequency and Frequency prototype will take turns, out of [...]
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Six sound effect generators using MM5837
This is a simple sound effect generators 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. 2. Rainstorm 3. The wind in the [...]
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Trembling sound buzzer circuit
A trembling sound buzzer circuit is create a kind of ring circuit that provide a strange sweetness of general bell. It use all transistor so easy to builds and cheap, suitable for bedroom or a private room good or may be adapted into a bell. Listening to children play leisure. In addition melodic sound then. […]
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European police siren circuit
The European police siren circuit is type of a siren. Which it is different from normal, is characteristics sound is high – low curtailed without like tone of voice common Siren. Which is strange, another, of the circuit type siren. Thought it would desirable. Amateur those electronic all. The working principle As circuit in this […]
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Chicken sound generator circuit
This is chicken voice sound generator circuit. Which I buy it from the electronic shop for my son as his first projects. It use a various sound from chips IC is a type of sound generator circuit. Which use principle digital memory is digital signal and program into ICs. Which all this movement. Be made […]
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How to make simple electronic buzzer
A electronic buzzer is simple. But useful well worth and the price is lower than 1$. By use just a 9-volts battery only. So without worrying about electrical leakage or electric shock from 220V to buzzer. Unless also has LED will glow. Show that the circuit the normal operation as well. The working of circuit. […]
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Simple intercom using tree transistors
This is simple intercom using transistors so easy to build and cheaper than ICs. They perfect for a small home, and to use basic or demonstration projects, from easy to find materials. It helped we can contact together simple in the house without have to walk a various room or shouting loudly, until may have […]
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The sound effect generator using CD4040 CMOS
This is a sound effect generator using small electronic components to generate since birds up to siren. With two IC-CMOS are main. This circuit can many loud sound in one. It is valuable for very educational, since the counter circuit, to convert digital signals to analog signals. Features of controlling frequency of Oscillator circuit using […]
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Two tone door buzzer using transistors
This is a two tone door buzzer, which is an electronic buzzer types,but them has melodic sound than the general electric bell. Which many people have seen the two tone bell sounds from other electronic journals. But they are circuit that made no who apply them, since Problems three reasons: 1.First, while do not press […]
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555 Siren sound Generator
A Sound Generator siren project, suitable for beginners. Build a simple, but widely applied. The siren sound is a sound listening to indeed impactful. Commonly used as a sounds alarms in many forms. such as a burglar alarm in the house or install in car as alert sound ask to give way on ambulance, police […]
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Simple Tone Generator using inverter logic form.
We use a simple oscillator circuit in very many projects. I like to use a inverter logic gate since it is easy and cheap. But we do not use it directly. Mostly I use IC4011 nand gates since includes for separate four positive logic nand gate on a single silicon chip. Enough for general use […]
The post Simple Tone Generator using inverter logic form. appeared first on Electronic projects circuits.
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Simple Electronic clock sound using IC4011
The sound of insects such as crickets, cicadas, resulting from flutter briefly. We can use a multivibrator to connects as sound generator circuit to imitate these insects sound. Some electronic clock alarm tone also sounds similar to these insects. As Figure 1 is simple clock alarm sound generator that can assemble on a breadboard right […]
The post Simple Electronic clock sound using IC4011 appeared first on Electronic projects circuits.
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The 4 sound effect using UM3561
Figure 1 The circuit diagram of The 4 sound effect using UM3561
Then a choosing sound at appear at output will can select with the connecting of both pin SEL1 (pin 6) and pin SEL2 (pin 1) either pin to to positive or negative or all release.
1. If release pin 1 and pin 6 quietly the IC will emit the Police car sirens.
2. If we connect pin 1 (SEL2) to positive voltage (4th position) will get the Space Machine Gun Sound effect.
3. If pin 6 (SEL1) is connected to the positive (position 2) we will hear the fire truck siren.
4. But pin 6 is connected to negative voltage (position 3) will will hear the Ambulance sirens.
In selecting will connect either pin SEL1 or SEL2 only. When we selected pin SEL1 or ???? SEL2 then the controller circuit inside IC will send signal to control and command counter circuit to identify the location of data in memory. While sending data to the audio generator circuit. To make Tone of according to the data being recorded.
The tone will be sent to pin 3 of IC1 , then it will be increased by both transistors Q1 and Q2 through R2. Which serves to limit current bias both transistor, the signal strength to be able to output sound to the speakers. Or If this sounds like a lot, It can be connected signal from pin 3 of IC1 goes into a high-gain amplifier circuit as needed.
How to build.
This project we can assemble them on the perforated board as Figure 2 because there are a few parts.
Figure 2 the component layout and wiring of 4 sound effect.
Figure 3 The project successfully been installed on the PCB.
I use a selector switch for select the sound output by I connecting wire as Figure 4
Figure 4 wiring the selector switch make we easy to choose tone output.
Applications
We can apply two AA 1.5 volts battery to supply of this circuit. If everything is OK Would have heard the Police car sirens out for sure. Then Then try the wires of lead SEL1 or SEL2,neither leg touches the positive, can signal one another.
Or can be modified in a theft or a kids toy. It does not rule any
As video below or Figure 5 is testing the projects
The part list.
Resistors 1/4W 5%
R1_________220K
R2_________10K
Semiconductors
Q1_________2N3904___NPN – transistor 0.5A 40V
Q2_________2N2222___NPN - transistor 0.8A 40V
IC1_________UM3561
Others
S1___Slide switch 3 lead.
S2___Selector switch 4 step.
Speaker 8 ohm 0.5W.
9 volts battery and snap connecter.
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Cricket voice with buzzer using LM324
Figure 1 is the circuit diagram of the Cricket voice with buzzer
IC1 / 2 generate frequency of about 50Hz. This frequency depends on R8 and C2. Which it serves to control IC1 / 1. To give a voice tone similar to the sound of crickets.
IC1 / 3 generate frequency of about 2.2Hz. This frequency depends on R13 and C3.This frequency to control the IC1 / 1. To sound frequencies for a cricket singing then stop.
Therefore, the sound of crickets is a tone generator circuit 3 sets. Which sends out pin 1 of IC1 / 1 R5 to pass on TR1 amplifier to the speaker on.
How to builds
This projects you can assemble all parts on the perforated board or universal PCB board. As Figure 2 is the components layout and wiring of this projects. And as Figure 3 is a project that I assembled on PCB and success to the next test.
Figure 2 the components layout and wiring
Figure 3 is the complete projects on PCB.
Testing
To apply a 9 volts battery to point “9V” LED lights are bright start - off at rhythmic. The range of LED lights and can be noisy as well. To adjust to the sounds of crickets, high or low, it can be adjusted to VR100K.
As video below is testing this project.
The part list
R1, R2, R7, R8, R10, R11, R15____10K
R3, R9, R12___________________5K
R4__________________________3K
R5, R6, R14___________________1K
R13_________________________47K
TRIMMER POTENTIOMETER
VR1_____________100K (104 code)
CERAMIC CAPACITOR
C1_______________0.0033uF (on 332 code)
ELECTROLYTIC CAPACITORS
C2______________1uF 50V
C3______________4.7uF 50V
TRANSISTORs
TR1_____________2SC458 or 2SC828, 2SC1815, 2SC945
DIODES
D1, D2___________1N4148___75V 150mA Diodes
IC
IC1______________LM324 Quad/ 1MHz/ Operational Amplifiers for Commercial/ Industrial/ and Military Applications
Note: If your friends are interested in this project. You can buy at:
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Rat and cockroach repeller circuit
This circuit is a rat and cockroach repeller which use principle of sound waves or ultrasonic cause they annoyed so it escaped away. This is small and cheap because use transistor (no ICs) and super loud since use large piezoelectric but use low current source. Technical information - Use power supply of 9 Vdc. - […]
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Refrigerator Door Detector Alarm
This is a Refrigerator Door detector alarm, it will detect light of lamp in the fridge and alert with buzzer. This projects is small size, easy to make and cheapest. It will alarm when Small child secretly eating candy or medicine stored in the refrigerator or sometimes forget to close the door is not closed. […]
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