Earthquake/knock Alarm

Introduction: Earthquake/knock Alarm

About: Hi! I make cool stuff in my free time. Follow me for more awesome projects, right from the roots of technology to most advanced gadgets!!!

this inexpensive project can be used as knock/vibration activated alarm.If you are outside India,look at the parts list given below.
RESISTORS                                                             CAPACITORS                          OTHER PARTS
R1=680Ω                                                            C1=22µF/25V                                 D1,D2=IN4148
R2=120Ω                                                            C2,C5=[104]100KPF                     LD1=LED[5mm]
R3=220KΩ                                                          C3,C4=100µF/25V                        Q1=BC557B
R4=22KΩ                                                            C6=[102]1KPF                                Q2,Q3,Q4,Q5=BC547B
R5,R8=1KΩ                                                                                                                   Q6=BC549
R6=2.7KΩ[2700Ω]                                                                                                        B1=Continuous 3-24Vdc buzzer
R7=100KΩ                                                                                                                     PIEZO=35mm 2 C/O piezoelectric sensor
R9,R12=4.7KΩ[4700Ω]                                                                                               a 9V snapper
you have to design your own pcb for this project.
the kit costs only Rs 77.
I bought the kit from my electronics teacher.
see the piezoelectric sensor.its a metallic disk

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Determining Color Code of Resistors

first and second band                         third band[multiplient]
0-black -------------------------------------------- 1                     
1-brown ------------------------------------------ 10=10^1
2-red ----------------------------------------------100=10^2
3-orange ----------------------------------------1000=10^3
4-yellow ----------------------------------------10,000=10^4
5-green---------------------------------------- 100,000=10^5
8-grey                                                       gold=0.1
9-white                                                     silver=0.01

Step 2: Put It Together-resistors

can you see the resistors?the resistors doesn't have any it can be mounted in any direction.

Step 3: Put It Together-capacitors

capacitors C1,C3 and C4 have polarity.the white strip on the capacitor represents its -ve.others are disk capacitors so they can be soldered in any direction.

Step 4: Put It Together-diodes

the two geranium diodes have a black strip on one is the cathode.

Step 5: Put It Together-LED

the led is also a it also have polarities.but how to find the polarities?there are no strips or colors.but there is a marking on an led.there is a flat portion on the can see it when you are viewing the upside part.

Step 6: Put It Together-transistors

do it in order.look at the diagram of the transistor.

Step 7: Put It Together-piezo,snapper and Buzzer

piezo sensor has no connect it as in the schematic.
connect the buzzer as shown in the schematic.
do the same for the snapper.

Be the First to Share


    • LED Strip Speed Challenge

      LED Strip Speed Challenge
    • Sculpting Challenge

      Sculpting Challenge
    • Clocks Contest

      Clocks Contest