Circuit for electronic musical instrument

Discussion in 'The Projects Forum' started by vibz90, Oct 24, 2009.

  1. vibz90

    vibz90 Thread Starter New Member

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    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...
  2. SgtWookie

    SgtWookie Expert

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  3. bertus

    bertus Administrator Staff Member

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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
  4. Audioguru

    Audioguru New Member

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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.
  5. Mike2545

    Mike2545 Active Member

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  6. vibz90

    vibz90 Thread Starter New Member

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    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.
  7. ELECTRONERD

    ELECTRONERD Senior Member

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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! :D).
  8. vibz90

    vibz90 Thread Starter New Member

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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??
  9. ELECTRONERD

    ELECTRONERD Senior Member

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    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?
  10. vibz90

    vibz90 Thread Starter New Member

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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?
  11. ELECTRONERD

    ELECTRONERD Senior Member

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    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.
  12. vibz90

    vibz90 Thread Starter New Member

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

    SgtWookie Expert

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    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.
  14. vibz90

    vibz90 Thread Starter New Member

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    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.
  15. SgtWookie

    SgtWookie Expert

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    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.
  16. bertus

    bertus Administrator Staff Member

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  17. ELECTRONERD

    ELECTRONERD Senior Member

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    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?
  18. SgtWookie

    SgtWookie Expert

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    Actually, using a 4017 Johnson counter as a sequencer.

    They'll need a 2nd 555 timer to clock the 4017.
  19. vibz90

    vibz90 Thread Starter New Member

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    thanks alot man, i think this is exactly what i needed, i will surely confirm it tomorrow, but thanks a lot....
    Regards
    Vibz
  20. vibz90

    vibz90 Thread Starter New Member

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    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
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