(1) The discharge circuit is composed of the operational amplifier A1-A4 and the IC1 regulator and the transistor BG1. The A1 constitutes a voltage-voltage converter, which can convert the 2.5V voltage generated by IC1 to 3.0V through A1, and the voltage from A2. The follower output serves as a reference voltage of the discharger. The core circuit of the discharger is composed of an A3 complementary connection to form an RS flip-flop to control the conduction and the cut-off of the discharge tube BG1;
(2) The charging circuit consists of IC2 DC/DC step-down switching regulator, which outputs 4.2V regulated voltage as a constant voltage charger power supply. Charges the battery EC. Working process: Turn on the input Vi power supply and load Battery EC, press S1, RS trigger flips, A4 outputs high level, BG1 turns on through R11, battery starts to discharge, discharge indicates LED2 is lit. At the same time, A3 output clamps timing capacitor C2 through D2. IC2 constitutes switch The power supply, therefore, the internal stop and no output, until the EC discharges to 3.0VR-S flip-flop and the A4 output goes low, causing BG1 to turn off. LED2 is off, the discharge is over. Another A3 leads to D2 cutoff, IC2 The switching power supply starts to output 4.2V stable voltage, and the battery is fixed and charged, and LED1 is lit for charging indication.
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.
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
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
Recordable Gift Cards, Mother's Day Music Card, Musical Greeting Card
AST Industry Co.,LTD , https://www.astsoundchip.com