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.