Simple Toy Orgen Circuit Schematic With Explanation

This is a toy orgen circuit diagram here I have used very common IC NE555.If you like to generate different sounds you can attach capacitors with different values.according to the value of the capacitor you can change the sound according to your wish.





Note


# Build this circuit on a PCB

# Don't use more than 9v

# Use only push to on switches

Basic Sound Generator Circuit Schematic With Explanation

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.






# Note

# Don't give over 5V
# Build this circuit on a PCB
# Don't give the much heat to the IC NE555

Digital Volume Control Circuit Schematic With Explnation

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.

Melody Generator using IC UM66 Circuit Schematic With Explnation

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.

Ding-Dong sound generator Circuit Schematic With Explnation

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

Two transistor siren Circuit Schematic With Explnation

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.

Whistle to beep Circuit Schematic With Explnation

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.

Simple radio Circuit Schematic With Explnation

some persons asked simple radio circuit diagrams.Here you can see very simple circuit diagram.When I tested this my first time I enjoyed very much.When the signals are coming you can here some sounds like ne ne nee nic nee nee nee nee.so test this and enjoy.






Note:

# Don't use more than 4.5V

# Build this on a pcb

#If the signals don't come move the main coil here and there then you can here some sounds.

# Firstly this circuit was designed by Elmer G. Osterhoudt in the early 30's

Touch Musical Bell Circuit Schematic With Explnation

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.




Note

# use 2W 8 ohm speaker
# This circuit can be operated with 3V power supply

Simple Melody Generator Circuit Schematic With Explnation

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.




Note:

# Don't supply more than 3V

# Build this circuit on a pcb

Police siren Circuit Schematic With Explnation

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.

Basic Sound Generator Circuit Schematic with explanation

Basic Sound Generator Circuit Schematic with explanation




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.






# Note

# Don't give over 5V
# Build this circuit on a PCB
# Don't give the much heat to the IC NE555

versatile voice modulator circuit using IC HT8950A

This is a very versatile voice modulator circuit using IC HT8950A from Holtek Semiconductors. The IC is capable of creating 7 upward or downward steps on the frequency of the input voice at a rate of 8Hz.

There is also two special variation effects namely Vibrato mode and Robot mode. This circuit finds a lot of application in systems like telephone, speech processors, toys, mixers etc. A microphone is used to pick up the input voice. Push button switches S2 and S3 can be used for the upward and downward frequency stepping.

Push button switch S1 can be used to activate Vibrato mode and push button switch S4 can be used to activate the Robot mode. IC HT82V733 (also from Holtek) is used to amplify the output of the voice modulator. LED D1 indicates the voice level.

Notes.

• The circuit can be assembled on a Vero board.
• Do not give more than 4.5v to the circuit.
• Switches S1 to S4 can be miniature push button switches.
• S5 can be a miniature ON/OFF switch.
• K1 can be an 8 ohm speaker.
• IC1 and IC2 must be mounted on holders.

melody generator(M66T series) used in telephones and toys

The M66T series is a CMOS LSI designed melody generator IC for use in telephones and toys application. It has an on-chip ROM programmed for musical performance. Produced by CMOS technology, the device results in very low power consumption. And with built-in RC oscillator, a compact melody module can be constructed with only a few additional components.

Components List:
C = 1uF
R = 4.7KW
Q = 2SC9013

• Pin 1 (O/P) Melody Output
• Pin 2 (Vdd) Positive Power Supply
• Pin 3 (Vss) Negative Power Supply

The following are the M66T series and the song generated by its series:

• M66T-01L : Jingle Bells + Santa Claus Is Coming To Town + We Wish You A Merry Christmas
• M66T-05L : Home Sweet Home
• M66T-09L : Wedding March (Mendelssohn)
• M66T-19L : For Alice
• M66T-68L : It Is A Small World

Source: kitsrus.com

simple and cost-effective ding dong electronic doorbell circuit based on IC 8021-2

Electronic doorbell circuit using IC 8021 is simple and cost-effective ding dong electronic doorbell circuit is based on IC 8021-2. The IC 8021 has an in-built circuitry to produce ding dong sound each time its pin 3 is pulled low. The sound is stored in the IC 8021 as bits, as in a ROM. The sound output from the IC 8021 can’t however drive a speaker directly, as this puts strain on the device.

Therefore a complementary-pair, two-transistor amplifier is used to amplify the sound to a fair level of audiblity. You may either use a piezo tweeter or an 8-ohm, 500mW speaker at the output. This simple electronic doorbell has not been tested.

During the standby period, the IC 8021 consumes nominal current of a few microamperes only. Therefore switch S1 may be kept closed. Each time switch S2 is pressed, ding dong sound is produced twice. If you try to press switch S2 a second time when the first ding dong sound is still being produed, it has no effect whatever and the two ding-dong bell sounds will be invariably produced.

S:electronicsuite.com

electronic circuit simulates a chime similar to the sound many cars

This circuit simulates a chime similar to the sound many cars make when the keys are left in the ignition. The bottom two gates form a squarewave audio oscillator that drives the base of the 2N4401, turning it on and off at an audio rate. The top two gates produce a short low-going pulse about once per second that discharges the 10 uF capacitor through the diode. The voltage then jumps up and slowly decays through the 15 k collector resistor when the 2N4401 is conducting. The result is a squarewave on the collector of the 2N4401 that jumps up quickly then decays slowly. The darlington emitter-follower buffers the squarewave and drives a small speaker.

The tone frequency is set by the 1000 pF capacitor and the cadence of the chime is set by the 0.1 uF capacitor. The 10 uF capacitor determines how quickly the chime dies out and the 3.3 k/3.3 uF soften the attack time of the leading edge of the chime. The volume is set by the 22 ohm resistor and 100 uF bypass capacitor. These values may be experimentally varied to produce the desired sound.

S:electronicsuite.com

stereo tape or cd player connecting to surround sound decoder

This is a simple surround sound decoder. Left & right outputs of a stereo tape or CD player can be connected to the circuit inputs and 4 outputs of the circuit can be connected to a surround power amplifier or 2 stereo power amplifier.

Advance Oatley Electronics K295 Stereo Tube Sound Line Buffer Amplifier Kit

Oatley Electronics K295 Stereo Tube Sound Line Buffer Amplifier Kit

The latest kit offering from Oatley Electronics is the K295 Stereo Tube Sound Line Buffer Amplifier Kit which retails for $36AU. The low cost, simple to construct, stereo tube buffer, lets you experience "tube sound". The kit is based around JAN 6418 sub-miniature vacuum tubes and designed for 100-120 or 200-240V 50/60Hz AC operation. These inexpensive tube kits can sound quite good, see Mark's review of the K272 Headphone Amplifier Kit and the recent review in audioXpress. Via - Mark [K295 stereo JAN6418 tube buffer / preamp kit].

Analysis of a Sound to Determine at Various Frequencies Using Mini Audio Spectrum Analyzer LM3915

The circuit has been designed to create a spectrum analyzer that will provide an analysis of a sound to determine at various frequencies, the volume of sounds that make up the overall sound spectrum.


Circuit Explanation
The device is sensitive enough to determine the sound wave components of frequency and amplitude with the changing of frequency and the width of an acoustic signal. The proportionality of signal width is indicated by the brightness of LED as it turns ON while the color indicates the proportionality of frequency. In order for the red LED to turn ON in strong signal, the sensitivity of the input circuit is adjusted by resistor R2. The middle signal is represented by a yellow LED while the low signal is indicated the green LED.
The 10 LEDs in 3 lines comprise the display unit which is ensured the IC2 as it functions as a counter decoder represented by the two gates ICa-b.the frequency of the counter is being regulated by R6. No LED will turn ON in the absence of any signal in the input. The LEDs will begin to flicker or blink depending on the intensity and tempo of the signal, once a signal has been applied in the input. The values of the resistors R4 & R5 can be varied that will be suitable for the desired requirements. Alternatively, this can be done by placing a 1K ohm trimmer in place of R4 & R5 during the initial regulation and adjustment of the values. It can be eventually removed and replaced with permanent resistors as soon as the desired values are achieved. Additional LEDs can be added in connection to IC2 although this circuit does not precisely measure the input signal.
Part List
R1= 1K8Kohm
R2= 100Kohm trimmer
R3= 1Kohm
R4= 100 ohm…..1Kohm
R5= 100 ohm…..1Kohm
R6= 100Kohm trimmer
C1= 100nF 100V
D1….10= RED LED
D11….20= YELLOW LED
D21….30= GREEN LED
IC1= LM3915
IC2= 4017
IC3= 4011
Application
This audio spectrum analyzer is a user interface component capable of making visible the sound pressure for a range of frequencies over time by taking a sample from an audio data stream and an animated visualization during the play is created in real time. It is ideal for any purpose which includes analysis and identification of human speech, ham radio audio reception tuning, analysis of vocal and instrumental music, evaluation and tuning of musical instruments, analysis of bat echolocation sounds, evaluation and calibration of home audio systems, and analysis and identification of biological sounds. Other uses of the audio spectrum analyzer are in distortion analysis, transfer functions, and digital filtering.

6 Channel Audio Graphic Equalizer Circuit with TL074

The audio circuit high quality complete low-noise 6-band graphic equalizer circuit is based on monolithic integrated circuit manufactured by linear TL074 .

6 Channel Graphic Equalizer Circuit with TL074

The EQ circuit is very easy to build and has a good quality. You can do it with component stereos portable tape recorders, radio cassette recorders, radios, etc. ..
Operational amplifiers on one chip. 6-band equalizer for a channel can easily by externally connecting capacitors and resistors, which are formed for (resonance frequency) UPDATE. Series connection of two makes TL074 (6 to 10 bands) and multi-band. It is very stable in the capacitive load. Maximum voltage 20V max VCC must not be exceeded. The operating voltage is about 5 to 15V. Use of force with pin-room shorted, the causes are the destruction or damage to the IC. Use when mounting the IC on the board of directors or, make sure that the pin does not contain spaces Lot, shorted, etc.

Electronic Part

IC1-2=TL074
C1=1uF 100V
C2=15nF 100V
C3=150nF 100V
C4=33nF 100V
C5=8.2nF 100V
C6=1nF 100V
C7=470pF 100V
C8=680nF 100V
C9=680nF 100V
C10=150nF 100V
C11=39nF 100V
C12=8.2nF 100V
C13=2.2nF 100V
C14=470nF 100V
R1=47Kohms
R2-5-18=150Kohms
R3-4=10Kohms
R6….17=10Kohms
R19=100Kohms
RV1…..6=100Kohms Lin .