Simple Buzzer Circuit Diagram

Hi friends today I'm going to give you a simple buzzer circuit diagram.This circuit operates with IC NE 555 .And also this circuit can be operated with 5V to 15V. By changing the variable resistor you can change the frequency.

Note:
# To get good result use 8 Ohm speakers.
# Build this circuit on a P.C.B

LED running Lights according to the Music

Here I'm going to give you a circuit diagram which is sensitive to sound.According to the sound this will blink its LEDs..Here we have used Tip31 transistor to light up the leds.But that power is not enough so I have used Lm386 Ic to boost the power of music.This whole circuit can be operated with 12v power.

Note

         # Build this circuit on a pcb

         # Add heat sink for transistor and ic if it is getting too heat

         # This circuit is not tested and we have done this according to a concept of a member.

         # you also can send us your circuit diagrams to our Email  

Simple 12V power AMP Circuit Diagram

I suppose all the vehicle lowers will love this circuit Because at present when we do a modification for a vehicle Amplifier  also acts a major role.Today we are going to give you5.8W Power Amplifier Circuit Diagram.Here we have used Ic TA222AP.When you use a speaker please use a speaker according to the power of the amp.

 TA7222AP pin out

Pin	Name	Description
1	Vcc	Supply Voltage
2	RR	Ripple Reject
3	MC	Muting control
4	OP	AF Signal Input
5	FB	FB Filter
6	GA	Gain adjust
7	GND	Ground
8	GND	Ground
9	OP	AF Output
10	BS	BootStrap

Simple sound generator Circuit

You all know normally Free circuit diagrams 4U gives wide range of   circuit diagrams So today we are going to give you a sound generator circuit diagram this circuit can be operated with 12V.Here we have used IC NE555

Note: Build this circuit on a pcb

110V / 230Vsimple Music Bell

Today we are going to give you a very simple circuit diagram.It is a music bell circuit diagram Already FREE CIRCUIT DIAGRAMS 4U has given you many musical bell diagrams so this circuit is design for 110V .Here If you changed the relay you can use this circuit with 230v not only that you can use this circuit with your motor bike or car.supply 110V to 110V relay and supply 3V to the um66 unit.

Note :-
             Build this circuit on a P.C.B
             If you are a kid don't try this circuit diagram

Simple Music Generator

This is a simple and enjoyable circuit diagram.Already free circuit diagrams 4U has given you many music bells.to build up this circuit we have used only on IC it is LM386 and you can run this circuit with 5V

Note:
         Build this circuit on a pcb
         Use 8Ohm speaker for this

Basic Sound Generator Circuit Diagram

This is so important circuit for the persons who came to this field recently.Here I have used common IC NE555. According to the pules (Frequency) of the IC We can generate the sound.You can change the speed of the sound by adjusting R2. This circuit operates with 5V.

Three sirens in one Circuit

This is a siren circuit diagram Here I have used UM3561 circuit diagram.This circuit can be operated with 3V.It can generate 3 sirens.Here I have used IC 2SC9013 you can use the same IC or similar IC. Use 8ohm 0.2W speaker.




Note:-

* Don't use more than 3V
* Don't use this for unnecessary things
* Build this circuit on a PCB

Simple Melody Generator Circuit Diagram

This is so impotent circuit for you all.On the other hand this is so important circuit for beginners.Here I have used IC UM66 You can get various musics when you buy UM66 with different numbers.

Touch Musical Bell

According to the present situation People are used to use various types of electrical equipments.So I thought to give you a very useful circuit.This is a Touch musical bell circuit diagram.When you just touch TP(touch plate)The circuit will activate.Here I have used very common IC UM 3481.

Canary chirp generator

This is a simple electronic alarm circuit that imitates the chirping of a canary. The circuit is nothing but a Hartley oscillator with few more passive components added. As the capacitor C1 charges through the resistor R1 and the transistor Q1 is driven to cut off. This makes the oscillations to stop. As the capacitor discharges through the Resistor R1 and base emitter junction of the transistor the oscillation start again. Actually the R1 and C1 are the components that make the characteristic chirping sound.







Notes.

* Assemble the circuit on a general purpose PCB.
* The circuit can be powered from a 9V PP3 battery.
* The transformer T1 can be a audio output transformer like LT700.
* If LT700 is not available, try the audio output transformer used on you old transistor radio board.
* The speaker can be an 8 ohm tweeter.
* Switch S1 can be a push button switch.
* The chirping sound can be altered by changing the value of R1 and C1.

Whistle to beep circuit

This simple circuit produces a beeping sound that lasts for around 3 seconds whenever you make a whistle. The CMOS Hex inverter CD4049 is the heart of this circuit. Out of the six inverters in CD4049, U1a is wired as an audio amplifier which amplifies the signal picked up by the microphone M1.The U1b is wired as a band pass filter with center frequency around 2KHz.The filter is necessary in order to pass the frequency corresponding to whistling sound and suppress all other frequencies .If the filter is not there, the circuit could easily get false triggered.U1d is wired as a 3S delay monostable multivibrator.The output U1d drives the astable multivibrator formed by U1e and U1f.The astable multivibrator is operating around 4Hz.The combined effect is a intermittent beeping sound that lasts for around 3S.Transistor Q1 is used to drive the buzzer B1.




Notes.

* Assemble the circuit on a good quality PCB.
* The circuit can be powered from a 3V battery.
* IC U1 is a CMOS CD4049 Hex inverter.
* M1 can be an electret microphone.
* B1 can be a 3V piezo buzzer.
* Mount the IC on a holder.
* The duration of beeping can be adjusted by varying the components C4 and R9.

Police siren

The circuit given here produces an alarm similar to the police siren. When you press the push button switch S2 capacitor C1 will charge and this will make the transistor Q1 to ON slowly. When the switch S1 is released the C1 will discharge and the transistor Q1 will become OFF slowly. When the Q1 is switched ON, its collector voltage falls and makes the transistor Q2 ON. The capacitor C2 will be charged almost to full supply voltage. This results in an increase in the collector-emitter voltage of Q2.This change in voltage is coupled to the base of Q1 via the capacitor C2.As a result the transistor Q1 comes slightly out of saturation. As a result the collector voltage of Q1 drops and makes the Q2 more OFF. This action continues until both transistors become OFF. Then the capacitor C2 discharges, and transistor Q1 will be switched ON again to start a new cycle. When the capacitor C1 is charged the tone will rise and when the capacitor C1 is discharging the tone will fall.





Notes.

* The circuit can be assembled on a vero board.
* The circuit can be powered from 9V DC.
* Switch S1 can be used as a power ON/OFF switch.
* K1 can be an 8 Ohm loud speaker.

Two transistor siren

Here is the circuit diagram of a simple two transistor alarm circuit that can be operated from a 9V PP3 battery. Here the two transistors are wired to form an oscillator whose frequency increases when switch S2 is pressed and decreases when S2 is released. In order to attain this the base of Q1 is biased from an RC circuit comprising of R2 and C1.When S2 is pressed C1 is charged through the resistor R2.As the voltage across the C1 increases the time constant decreases and this results in an increases in the frequency. When S2 is released capacitor discharges and the frequency of the tone decreases. The sound heard from the speaker will be almost like that of a siren.




Notes.

* The circuit can be assembled on a Vero board.
* Use a 9V PP3 battery for powering the circuit.
* Switch S2 can be a miniature push button switch.
* The type no of transistors are not very significant here.

Ding-Dong sound generator

This is the circuit diagram of a ding dong sound generator based on two NE555 timer ICs.The circuit is designed to toggle between two adjustable frequencies to produce the ding dong sound. The first NE555 (IC1) is wires as an astable multivibrator operating at 1Hz. The frequency of the second NE555 (IC2) is modulated by the output from the first IC. This is attained by connecting the output of first IC to the control pin (pin5) of the second IC. The tone of the sound depends on the frequency of the second IC and the changeover time depends on the frequency of the first IC.






Notes.

* The circuit can be assembled on a Vero board.
* Use 9V PP3 battery for powering the circuit.
* POT R4 can be used to adjust the tone of the sound.
* POT R2 can be used to adjust the change over time.
* IC1 and IC2 must be mounted on holders.
* K1 can be a 8 ohms, 1/2 watt tweeter

Melody Generator using IC UM66

Here is the simplest melody generator circuit you can make using an IC.The UM66 series are CMOS IC’s designed for using in calling bell, phone and toys. It has a built in ROM programmed for playing music. The device has very low power consumption.Thanks for the CMOS technology.The melody will be available at pin3 of UM66 and here it is amplified by using Q1 to drive the speaker.Resistor R1 limits the base current of Q1 within the safe values.Capacitor C1 is meant for noise suppression.














Notes

* Power supply must be between 1.5V & 4.5V .Do not exceed 4.5 V.
* Speaker can be driven with external NPN transistor.
* Melody begins from the first note if power is reseted.
* Assemble the circuit on a good quality common board.
* If transistor HE8050S is not available use any NPN transistor like BC548 or 2N2222.

Digital Volume Control

This circuit could be used for replacing your manual volume control in a stereo amplifier. In this circuit, push-to-on switch SW1 controls the forward (volume increase) operation of both channels while a similar switch SW2 controls reverse (volume decrease) operation of both channels. A readily available IC from Dallas semiconductor, DS1669 is used here.








Parts:

J1 = RCA Audio Input Socket J2 = RCA Audio Input Socket C1 = 0.1uF-16V Ceramic Disc Capacitor C2 = 0.1uF-16V Ceramic Disc Capacitor C3 = 0.1uF-16V Ceramic Disc Capacitor IC1 = DS1669 (is available from Dallas SCo. SW1 = Momentary Push Button Switch SW1 = Momentary Push Button Switch

Notes:


* Replaces mechanical variable resistors. * Electronic interface provided for digital as well as manual control. * Wide differential input voltage range between 4.5 and 8 volts. * Wiper position is maintained in the absence of power. * Low-cost alternative to mechanical controls. * Applications include volume, tone, contrast, brightness, and dimmer control. * The circuit is extremely simple and compact requiring very few external components. * The power supply can vary from 4.5V to 8V. * The input signal should not fall below -0.2 volts.

Six-LED Bar Power Indicator

This device, connected to the loudspeaker output of an audio amplifier, will indicate the instantaneous output power delivered to the loudspeaker(s) by means of six LEDs illuminating one after another by voltage values increasing little by little, providing the visual impression of a luminous bar or column, increasing and decreasing in height following the increase and decrease of the signal's level.The input signal is first rectified by D1 and then sent to six different voltage dividers, one for each LED. In this way, the indication provided by the LEDs illumination of this "Power Display", will be related to the instantaneous power sunk by the whole loudspeaker cabinet.Six output power levels are displayed by the LEDs in a 2W - 80W range (no setup required). Each nominal power level indication into 8 Ohms load is reached when the respective LED illuminates at full brightness.










Parts:


R1_____________220R 1/2W Resistor
R2,R5,R6,R8____100R 1/4W Resistors
R10,R12,R14____100R 1/4W Resistors
R3_____________220R 1/4W Resistor
R4,R7__________330R 1/2W Resistors
R9_____________560R 1/2W Resistor
R11____________820R 1/2W Resistor
R13______________1K2 1/2W Resistor
D1___________1N4004 400V 1A Diode
D2,D4,D6__BZX79C2V7 2.7V 500mW Zener Diodes D3,D5,D7,D8,D9,D10 Red LEDs (Any dimension and shape) (See Notes)


Notes:


The output power indicated by each LED must be doubled when 4 Ohms loads are driven. * The circuit can be adapted to suit less powerful amplifiers by reducing the number of LEDs and related voltage dividers. * LEDs of any dimension can be used, but rectangular shaped devices will be more suitable to be compacted in bars or columns. * For a stereo amplifier, two identical circuits are required.

5 band graphic equalizer using a single IC

This circuit uses a single chip, IC BA3812L for realizing a 5 band graphic equalizer for use in hi-fi audio systems.The BA3812L is a five-point graphic equalizer that has all the required functions integrated onto one IC. The IC is comprised of the five tone control circuits and input and output buffer amplifiers. The BA3812L features low distortion, low noise, and wide dynamic range, and is an ideal choice for Hi-Fi stereo applica-tions. It also has a wide operating voltage range (3.5V to 16V), which means that it can be adapted for use with most types of stereo equipment.







The five center frequencies are independently set using external capacitors, and as the output stage buffer amplifier and tone control section are independent circuits, fine control over a part of the frequency bandwidth is possible, By using two BA3812Ls, it is possible to construct a 10-point graphic equalizer. The amount of boost and cut can be set by external components. The recommended power supply is 8V, but the circuit should work for a supply of 9V also. The maximum voltage limit is 16V. The circuit given in the diagram operates around the five frequency bands: * 100Hz * 300Hz * 1kHz * 3kHz * 10kHz

5 band graphic equalizer

This circuit uses a single chip, IC BA3812L for realizing a 5 band graphic equalizer for use in hi-fi audio systems.The BA3812L is a five-point graphic equalizer that has all the required functions integrated onto one IC. The IC is comprised of the five tone control circuits and input and output buffer amplifiers. The BA3812L features low distortion, low noise, and wide dynamic range, and is an ideal choice for Hi-Fi stereo applica-tions. It also has a wide operating voltage range (3.5V to 16V), which means that it can be adapted for use with most types of stereo equipment.

The five center frequencies are independently set using external capacitors, and as the output stage buffer amplifier and tone control section are independent circuits, fine control over a part of the frequency bandwidth is possible, By using two BA3812Ls, it is possible to construct a 10-point graphic equalizer. The amount of boost and cut can be set by external components.

The recommended power supply is 8V, but the circuit should work for a supply of 9V also. The maximum voltage limit is 16V.

The circuit given in the diagram operates around the five frequency bands:

100Hz
300Hz
1kHz
3kHz
10kHz