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.


# Note

# Dont give over 5V
# Build this circuit on a PCB
# Dont give the much heat to the IC NE555

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Melody Generator using IC UM66

Here is the most straightforward melody generator circuit that you might make the utilization of an IC.The UM66 series are CMOS IC’s designed for the usage of in calling bell, cellphone and toys. It has a inbuilt ROM programmed for taking section in tune. The instrument has very low power consumption.Thanks for the CMOS technology.The melody might be available at pin3 of UM66 and here it's amplified by using the utilization of Q1 to drive the speaker.Resistor R1 restricts the base current of Q1 within the protected prices.Capacitor C1 is supposed for noise suppression.Notes

* Power provide have to be between 1.5V & 4.5V .Do no longer exceed four.5 V.
* Speaker can also be pushed with external NPN transistor.
* Melody begins from the first no longere if energy is reseted.
* Assemble the circuit on a just right quality well-liked board.
* If transistor HE8050S is simply not to be had use any NPN transistor like BC548 or 2N2222.

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Baud Rate Generator

In this article, an RC oscillator is used as a baud rate generator. If you can calibrate the frequency of such a circuit sufficiently accurately (within a few percent) using a frequency meter, it will work very well. However, it may well drift a bit after some time, and then…. Consequently, here we present a small crystal-controlled oscillator. If you start with a crystal frequency of 2.45765 MHz and divide it by multiples of 2, you can very nicely obtain the well-known baud rates of 9600, 4800, 2400, 600, 300, 150 and 75. If you look closely at this series, you will see that 1200 baud is missing, since divider in the 4060 has no Q10 output!

If you do not need 1200 baud, this is not a problem. However, seeing that 1200 baud is used in practice more often than 600 baud, we have put a divide-by-two stage in the circuit after the 4060, in the form of a 74HC74 flip-flop. This yields a similar series of baud rates, in which 600 baud is missing. The trimmer is for the calibration purists; a 33 pF capacitor will usually provide sufficient accuracy. The current consumption of this circuit is very low (around 1mA), thanks to the use of CMOS components.

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