Here is the very rough English instructions:
Theory of operation
The NE555 timer is set up to run as an astable oscilator, with a frequency determined by R48, R49 and C27.
f = 1.44/((R48+2*R49)*C27)
f = 1.44/((1000+2*2000000)*0.0000001)
f = approx 4 Hz
The output of the NE555 drives LED D1, with R50 controlling the current through the LED.
It also drives the clock input of the CD4017 decade counter. Only ne of the outputs of the counter (Y0-Y9) is on at any time, and then each time the clock signal rises it moves on to the next output - taking 10 cycles to return to the original state. Each of the 10 outputs drive an LED, through a current limiting resistor.
The CD4017 also has a "carry output" Is the input divided by 10, and goes from low to high when the selected output wraps from Y9 back to Y0. This output is used to drive four transistors, which in turn drive the four LEDs in the corners of the board. The four diodes are not functionally significant, but R61-R64 limit the current into the transistor, and R65-R68 limits the current through the diodes.
Parts list
Qty Value Pkg Part
1 Circuit board 48x60mm PCB
1 NE555 SO-8 U1
1 CD4017 SO-16 U2
2 0.1uF Capacitor 0805 C27, C28
11 Red LED 0805 D1-D11
4 Blue LED 0805 D11-D15
4 1N4148 L34 D13-D15
4 S8050 SOT-23 Q1-Q4
1 2M Resistor 0805 R49
15 470Ohm Resistor 0805 R50-R68
Additional parts (for the back of board, not actively used):
Qty Part Pkg
8 1206 Resistor 1206
20 0603 Resistor 0603
20 0402 Resistor 0402
6 Resistor array 0603*4
Assembly
Step 1
- Identify R49 (2M Ohm Resistor - marked 205) and solder in place
- Identify R48 (10k Ohm Resistor - marked 103) and solder in place
- Identify C27 & C28 (0.1uF Capacitors - unmarked) and solder in place.
- Solder the NE555, taking care to orient it correctly.
- Identify R50 (470 Ohm, marked 471) and solder in place
- Identify the LED D1, and solder in place. Take care to orient the green stripe to the striped end
- Attach some power wires to the + and - pads, to allow it to be attach to your power source
Test - the LED should blink a frequency of about four times per second. The most common problem the LED is the wrong way round,
Step 2
- Solder on U2, taking care to orient it correctly
- Solder on LED D2, taking careful note of orientation
- Solder on the R51 (marked 471) resistor for the LED
- Test - it should come on briefly once every 2.5 seconds
Step 3
- Solder on the rest of the LEDs and resistors in the circle.
- Test - all the the LEDs should light in sequence
Step 4
- Solder on the four diodes D12 - D15
- Solder on the four transistors, Q1-Q4
- Solder on the four remaining 470 ohm resistors, R65-R68
- Solder on the four remaining LEDs, D16-D19
- Test
Project Complete!