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8 |
| Author | Views | Views Today | Rank | Comments |
| 22,887 | 4 | |
8 |
| This neat little circuit can play 8 note tunes at any speed you want. You select the notes with 8 trim pots. The speed in selected through a ninth pot. The circuit draws very little power and can be powered by a 9 volt battery, with the addition of a 7805 regulator to power the TTL logic used. |
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| do the 8 tones/pitches/notes play in sequential order dictated by the number pots? For example. R3 for 1/4 note ,R4 for a 1/4 note, R5 for a 1/4 note, and so on? Although I'm not new to music or music theory...I am new to circuit building. thanks! | ||
| pls can anyone telme wat is the alternative for 3909 IC for building 8 note player.. plz | ||
| here i request u to plz explain me the circuit's working and does it work surely??...becoz i hav very less time 4 submiting it and i need a working project./..so plzzz guide me...hoping 4 a quick response | ||
| R1 controls the speed at which the notes are played. R3-R10 control the pitch of those notes.!!:D | ||
| Dear sir: I am building the 8 note tune player, have found that the 3909 led oscillator is obsolete, I was told to use a 555 timer for amplification could you tell me how the wiring should be? having some problems figuring out, your response would be appreciated asap. | ||
| Hi sir some confutin of 9v bettry and other used to 12v adopter use or not so plz kindly answer me ko sir and purpose of 8note tune player and compleate operation and made the circuit connection . iam weatting for your answer samad | ||
| Here is what I think: R1 is used to set the bpm of the song. In 4/4 time, 60bpm = 1bps, 1 quarter note = 1 second in length = 1hz. Change R1 to speed up 555 and bpm goes up shortening the length of a quarter note. R3-R10 in conjunction with the 3909 control the frequency that is sent to the speaker, ex: if you wanted to send middle C through the speaker set one of them to send 261.626Hz down the line there. There is a decent amount of info on the internet about it to figure which R values to use. All the U5/U7 do is act as the switch (to automate the sequence) instead of a person hitting a button. | ||
| Can anyone describe what this circuit is supposed to do better than the description provided on this page? Mainly, does the first trim pot switch the notes (aka switches which trim pot is affected the sound) or does it just change the frequency of the tone? | ||
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