8 Note Tune Player

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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.


This is the schematic of the 8 Note Tune Player


Total Qty.
R1110K Trim Pot
R211K 1/4 W Resistor
R3, R4, R5, R6, R7, R8, R9, R108500 Ohm Trim Pot
C1, C3210uF 12V Electrolytic Capacitor
C211uF 12V Electrolytic Capacitor
U11555 Timer
U217490 Binary Counter74LS90, 74HC90
U317445 BCD To Decimal Decoder74LS45, 74HC45
U4, U627404 Hex Inverter74LS04, 74HC04
U5, U724016 Quad Bilateral Switch
U813909 LED Flasher/Oscillator
SPKR118 Ohm 500mW Speaker
MISC1Board, Wire, IC Sockets


  1. R1 controls the speed at which the notes are played. R3-R10 control the pitch of those notes.
  2. The circuit will operate fine on a 9V battery, with the addition of a 7805 regulator to power the TTL logic used.
  3. The missing pin on U2 is pin 14.

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8 Note Tune Player
Monday, August 15, 2011 12:33:11 PM
Unfortunately the LM3909 is no longer manufactured. It's easy to redesign the circuit with a NE556 in place of U1 and U8. There are better ways to do this. You could replace all those ICs with a single microcontroller, such as the PIC12F508 or a melody generator IC such as the UM66 or M66T.
8 Note Tune Player
Friday, August 05, 2011 8:47:04 PM
i imagine this produce funny or wierd song? cause its only use binary count up. But still good for Learning Digital Technique via this Digital ICs. if use EPPROM IC that can save binary data, it can be more fun. 8 bit = do,re,mi,fa,so,la,ti,do...
8 Note Tune Player
Saturday, April 18, 2009 11:23:38 AM
I don't see what's so hard to understand here: the first stage, the 555 timer, determines the tempo, bpm, or speed of the song. Trimpot R1 is used to adjust this speed. The clock from the 555 timer is put into a timer, which simply counts (so your song is in order). You don't touch anything there. Lastly, resistors R3-R10 control the frequency for each note in the song. The circuit first looks at R3, and plays a note based on its resistance (how far it's spun). It moves on to R4, until it reaches R10 and comes back at the beginning. Hope that helps. PS: You could replace 4016 with transistors, correct?
8 Note Tune Player
Saturday, March 07, 2009 12:45:34 AM
can you describe the 8note and how can we serch it?
8 Note Tune Player
Monday, April 14, 2008 11:17:05 AM
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!
8 Note Tune Player
Friday, April 04, 2008 4:45:39 AM
pls can anyone telme wat is the alternative for 3909 IC for building 8 note player.. plz
8 Note Tune Player--description
Saturday, January 05, 2008 3:35:06 AM
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
8 Note Tune Player
Monday, November 26, 2007 6:34:34 PM
R1 controls the speed at which the notes are played. R3-R10 control the pitch of those notes.!!:D
Pat tpnymous
8 Note Tune Player
Tuesday, August 21, 2007 3:54:54 PM
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.
8 Note Tune Player
Thursday, May 03, 2007 7:13:51 AM
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
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