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  #1  
Old 10-24-2009, 05:07 PM
vibz90 vibz90 is offline
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Default Circuit for electronic musical instrument

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...
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Old 10-24-2009, 05:20 PM
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SgtWookie SgtWookie is offline
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You might consider using a 555 timer.
http://uk.farnell.com/texas-instrume...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.
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Old 10-24-2009, 05:21 PM
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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
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Old 10-24-2009, 10:11 PM
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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.
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Old 10-24-2009, 10:24 PM
Mike2545 Mike2545 is offline
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Well I dont know if you could make one of these but it will play .wav files

http://www.talkbotbrain.com/
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Old 10-25-2009, 12:27 AM
vibz90 vibz90 is offline
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Default Thanks a lot

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.
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Old 10-25-2009, 12:34 AM
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ELECTRONERD ELECTRONERD is offline
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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! ).
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Old 10-25-2009, 12:37 AM
vibz90 vibz90 is offline
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actually i want the immature songs only, as immature as possible... but how to programme it, and what is the basic circuit??
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Old 10-25-2009, 12:46 AM
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Quote:
Originally Posted by vibz90 View Post
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?
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Old 10-25-2009, 12:53 AM
vibz90 vibz90 is offline
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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?
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