Internal block diagram 
Pin function description:
The 1st and 2nd pins are usually grounded through a capacitor to form an output filter network and a loop single-stage low-pass filter network. The capacitance of the 2 pin determines the capture bandwidth of the phase-locked loop: the larger the capacitance, the narrower the loop bandwidth. The capacity of the capacitor connected to the 1 pin should be at least 2 times the capacitance of the 2 pin.
Pin 3 is the input and requires an input signal ≥25mV.
The external resistors and capacitors of pins 5 and 6 determine the center frequency f2 of the internal voltage controlled oscillator, f2≈1/1.1RC.
Pin 8 is the logic output and internally has an open collector transistor that allows a maximum sink current of 100mA.
LM567 electrical parameters:
The LM567 operates from 4.75 to 9V, operates from DC to 500kHz, and has a quiescent operating current of approximately 8mA. As shown in the figure below
Typical application circuit
Note: The touch-tone button sound refers to the dual tone multi-frequency (DTMF) that uses two tones to represent each key on the keyboard. When the button is pressed, the vertical and horizontal lines are generated, and then the double tone. For example, pressing the "5" key will produce 770 Hz and 1336 Hz.
Musical Greeting cards (recordable greeting cards):
Ningbo AST Industry Co.,Ltd has 17 Years Experiences to produce the greeting cards,Christmas Card,Birthday cards,Religious Cards,musical greeting cards,recordable greeting cards, greeting cards with Led lights,Pop-up Greeting cards etc.We can assure you of competive price,high quality,prompt delivery and technology supporting.
1. Musical Greeting cards Application :
The Greeting cards are usually used for celebration,promotion,birthday,Holiday and so on.
2. recordable greeting cards Classification:
There are the General Greeting Cards,Recordable Greeting cards,Music Greeting cards,Led Greeting cards and Pop-up Greeting cards.
A,General Greeting Cards,which is only paper cards,printed according to the Customers' Artwork
B.Recordable Greeting cards----The Clients can record their own messages and playback them.
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C.Musical Greeting cards---The clients provide their audios,then we programmed them into the Sound module,then it will play the customized audios.
D.Led Greeting Cards--The Greeting cards have led lights,which can flash different color.
E.Pop-up Greeting Cards
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3.Sound Quality:Clearly and Loudly ( 16Khz Sampling Rate)
4.Activated way:
Slide tongue---open the cards,it will play the message automatically.
Push buttons--press the button to play the message/audio/music
5.Long Lifespan
6.Speaker:21mm,27mm,29mm,36mm,40mm,57mm etc. Plastic or Metal
7.Battery:AA, AAA, AG13, AG10, AG3 and so on environmental
8.Size and Artwork: Customized
9.PCB:Customized Size (OEM or ODM) or our existed standard size
10.Certification:CE ,Rohs
11.Export to: USA, UK,Canada,Germany,
Turkey,Russia,Poland,Switzerland,Netherland ,Frence Hungary
,Australia,New Zealand, Brazil, Columbia,Argentina,Thainland,Singapore ,
Malaysia and so on
Musical Greeting Cards, Recordable Greeting Cards, Musical Birthday Cards
AST Industry Co.,LTD , https://www.astsoundchip.com