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1、EC1204 Pv1.2 Electronic welding assembly Tutorials Welding sequence: low to high Note: Step 5 and Step 7 can not turn, or not assembled welding. Step 1: Complete SMD components welding; following two charts PNP Transistor：Q1、Q6、Q7、Q8、Q9、Q10、Q11、Q12、Q13) 10K Resistor：R6、R12、R14、R16、R18、R20、R26、R29、R3
2、1、R32、R33、R34、R35 47 ohm Resistor：R5、R11、R13、R15、R17、R19、R25、R27、R30 20pF apacitance：C3、C4 104 capacitance：C2、C5 PNP Transistor：Q2、Q3、Q4、Q5 10K Resistor：R1、R2、R3、R4、R21 47 ohm Resistor：R7、R8、R9、R10 20pF capacitance：C6、C7 Step 2: Welding and 32.768KHz 12MHz crystal oscillator, cut excess pin flat 32.
3、768KHz crystal shown above is recommended for welding, so you can hold the crystal. Step 3: torch lights installed, note the location of the + and red light installation,D5*、D10*、D15*、D20*、D25*、D30*、D35*、D40*、D45*、D50*、D55*、D60* are the red lights. after assembling books and other things to suppress
4、 the formation of all the lights, and then rewind over and solder one pin of a pin, finished weld 60 LED lights will cut all of its pins Step 4: Welding sensor DS18B20, cut flat extra pins. Step5: Welding three buttons RST, MODE, PLUS; 8-pinIC socket U2;40-pin IC socket U1;battery holder BT1. Step 6
5、: 8-pin IC cut flat seat and battery holder on extra pins Note: This step must be, otherwise the back of the LED will not be assembled. Step 7: Welding at DS1 digital tube, cut flat extra pins, note the direction of digital tube placement, upside down LED will not be displayed. Note: The four dots d
6、igital control word to be heading EC1204B V1.2 side, as indicated by an arrow Step 8: Welding 6-pin pin, note: four 6-pin pin pin pad next to the reserved, no welding. Step 9:buzzer(SPEAKER),100uFcapacitor-C1,miniUSB-USB; Cut flat extra pins. Note: mini USB USB interface is directional and must be a
7、ssembled as shown in the following diagram, otherwise it will reverse the positive and negative power supply system, causing burn chips Note the direction of welding miniUSB Step 10: Install AT89S52 microcontroller, DS1302 clock chip, battery, pay attention to the direction of the chip gap. Following chart shows the arrow: front elevation back elevation
