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4 bit digital electronic clock chip DIY
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Description
Features
Special red digital clock for display;
AT89C2051 master chip;
1.2mm thick PCB made from FR-4 board;
time error range -1 to +1 seconds every 24 hours.
AT89C2051 master chip;
1.2mm thick PCB made from FR-4 board;
time error range -1 to +1 seconds every 24 hours.
Supply with 5V
Functions
Second corrections
Iterface: hours/minutes or minutes/seconds
ON/OFF alarm sound
Two alarm settings (you can turn off the alarm function)
Iterface: hours/minutes or minutes/seconds
ON/OFF alarm sound
Two alarm settings (you can turn off the alarm function)
Components
|
Name |
Specification |
Quantity |
Identifier |
|
0.25w resistance |
4.7K |
5 |
R1.R3-R6 |
|
Exclusion |
470*9 |
1 |
R2 |
|
electrolytic capacitor |
10uf |
1 |
C1 |
|
|
100UF |
1 |
C4 |
|
ceramic capacitor |
30p |
2 |
C2, C3 |
|
|
104 |
1 |
C5 |
|
diode |
IN4007 |
2 |
D1, D2 |
|
Nixie tube |
0.4" |
1 |
DS1 |
|
crystal oscillator |
12HMz |
1 |
T1 |
|
key switch |
6*6 |
2 |
S1, S2 |
|
audion |
8550 |
1 |
Q1 |
|
singlechip |
AT89C2051 |
1 |
V1 |
|
socket |
DIP20 |
1 |
|
|
buzzer |
5V |
1 |
V2 |
|
terminal |
KF126-2P |
1 |
J1 |
|
circuit board |
|
1 |
|
Schematic diagram
You can find in "Download" section the instructions manual. Regarding to assembly, you have footprints of components on PCB.
Product Details
JOMYFT_clock_kit
39 Items
Specific References
- EAN13
- 6427854014085
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