Hello
I am new to this forum, so do tell me if there is any mistake...
I have no idea about electronics and my teacher gave me an assignment regarding musical instrument.

I have to design a circuit for a musical instrument that can play a short section of music, like the XP log on or log off sound using low cost components available on uk.farnell.com and uk.rs-online.com/web.there was something related to frequency generator also, to identify the frequencies of the sound to be played. i used the frequency generator and found the frequency of the notes of my music, but i don't know how to design an instrument that can play those notes when i press the button for that frequency. the frequency range should be as simple as possible, and should contain around 5 musical notes
I have no idea from where should i begin.
plz help me as soon as you can...
Thanks a lot in advance...

 

You might consider using a 555 timer.
http://uk.farnell.com/texas-instruments/sa555pg4/timer-precision-dip8-555/dp/9589953
Download the datasheet, and look at the astable multivibrator modes.

Formulas are given for determining resistor and capacitor values to use to generate the desired frequency output.

 

Hello,

It looks like a homework assignment so I will give some idea's and not a complete schematic.
You could make a sequencer with a 555 and a 4017.
On the outputs of the 4017 there can be pots to adjust the tones of the audio oascillator.

Greetings,
Bertus

 

A very simple oscillator like a 555 makes square-waves that sound like a buzzer.
A musical instrument does not make noises like a variable-frequency buzzer.

Instead you need a complicated circuit that makes the waveforms and attack/decays of a musical instrument.

 

Well I dont know if you could make one of these but it will play .wav files

http://www.talkbotbrain.com/

 

friends, thanks a lot for your help... but, i still have no idea, i don't know what a sequencer is, where should i put it in.

 

You could also take the BASIC stamp and program it to sound at different notes or frequencies. All you have to do is program it to produce a certain frequency. I actually made my BASIC stamp to play twinkle-twinkle little star (an immature song I know...but I'll have it playing a concerto in no time! ).

 

actually i want the immature songs only, as immature as possible... but how to programme it, and what is the basic circuit??

 

actually i want the immature songs only, as immature as possible... but how to programme it, and what is the basic circuit??

Well, isn't that ironic? Ok then take a look at this link:

http://www.parallax.com/tabid/295/Default.aspx

That's what your going to need; the "BASIC Stamp". It makes it much easier if you have the entire development board so I would recommend that you purchase the "Boe Bot" which includes the BASIC Stamp. It will also come with a complete student guide which will help you with all the programming. Here is the link to buy that:

http://www.parallax.com/tabid/411/Default.aspx

You might be able to find it cheaper somewhere else but nevertheless, better start saving up de' "Mullah".

Hopefully there is a more inexpensive solution, but I bet you would still like to play around with that robot anyway?

 

bro, it is becoming a bit complicated, I want the most simple one, a simple circuit , is this circuit (for instrument) as simple as it can be?? I have to design a simple circuit on the circuit board to show it to the teacher, will this work? How to use it?

 

bro, it is becoming a bit complicated, I want the most simple one, a simple circuit , is this circuit (for instrument) as simple as it can be?? I have to design a simple circuit on the circuit board to show it to the teacher, will this work? How to use it?

Well you won't actually assemble or solder any parts but you'll be programming. Does that count? You might have to ask your teacher. I suppose this wouldn't be considered the simplest way, but it works.

 

thanks man, i will ask him on monday and wil reply you then, thanks alot... thnx alot, thank you....

 

Ahh, there will be a significant cost for a Basic Stamp, and the necessary hardware to program one; somewhere in the range of $130 USD+; more expensive in the UK. I don't think this is what our OP's instructor had in mind.

 

If this is not, then is there any other option, what is the other way? How should i start? Do i have to make a circuit of BJT's?? Give me your opinion Sgt.

 

Did you look at the 555 timer IC? It would be an inexpensive way to experiment.

Don't worry about Audioguru's comment. You're not trying to make an instrument suitable for a concert; just something that will output a sequence of tones.

 

Hello,

Take a look at the PDF in the link:
http://www.epanorama.net/schematics...d_Effects_and_Synthesizers/Tone Sequencer.pdf

The link comes from this page:
http://www.epanorama.net/schematicsforfree/Audio/Circuits/Sound_Effects_and_Synthesizers/index.php

Greetings,
Bertus

 

I suppose that he could use the 555 with multiple switches; each going to different component values that determine the output tone. Is that what you had in mind?

 

I suppose that he could use the 555 with multiple switches; each going to different component values that determine the output tone. Is that what you had in mind?

Actually, using a 4017 Johnson counter as a sequencer.

They'll need a 2nd 555 timer to clock the 4017.

 

thanks alot man, i think this is exactly what i needed, i will surely confirm it tomorrow, but thanks a lot....
Regards
Vibz

 

thank u guys, thanks a lot for your help, i think i have got what i neede, still i wil let you guys know... thanks again
Regards
VibZ