How to Repair Mosquito Swatter Bat
First open the mosquito bat by using screwdriver, Inside bat we will find simple power electronic circuit, consisting of battery, Transistor, resistors, capacitors , diodes and small transformer.The basic function of this circuit is to generate very high voltage across output and electric fence so mosquito will die immediately when it came in contact with fence.
We need a digital Multimeter OR Analog Multimeter to check the various electronic components.
Caution: Never keep Multimeter probes directly on the electric fence, it may result in damage to Multimeter and even we may face some shock.
Image showing circuit of mosquito bat
First Remove the battery and test the battery carefully, check voltage of battery, if it is a 3 V(DC) battery, when you check with Multimeter it should show same rated voltage( in fully charged condition), if it indicates 0 or low value then battery is damaged.
After removing battery, now test the electronic components, for testing electronic components keep the Multimter in continuity mode, You will hear a buzzer sound when you one probe is touched with other. In continuity mode of Multimeter we can find short Circuits ,suppose if you test a diode and if you hear buzzer sound then diode is short circuited indicates it is damaged.
Now with the help of Multimeter test all the components, in mosquito bat there is less chance of failing of transformer.so first test all other components
In mosquito bat there is more chance of failing of transistor, so check the transistor and if it is damaged replace it.
How to check the Transistor:
It is better to check the transistor after removing it, So Desolder the transistor from circuit board with help of soldering rod.(Please be careful while using soldering rod,if you have no practice of using it better avoid it using) or use Desoldering tool to remove it carefully.
For NPN transistor Keep one probe(Red) on Base and other(Black) on emitter, Multimeter should indicate some resistance value, when we reverse the probe(Red probe on emitter and Black on Base) it should indicate "1" Next keep probe(Red)on base and other(Black) on collector, Multimeter should indicate value and when you reverse the probe Multimeter should indicate "1" .Now keep one probe in Emitter and other in Base , Multimeter should indicate value "1" and if you reverse the probe Multimeter should indicate the same-: "1".
For PNP type transistor when probe(Red) on emitter and black on base it should indicate resistance value and when black probe on emitter and Red probe on base it should indicate "1".Next keep probe(Red)on base and other(Black) on collector, Multimeter should indicate "1" and when you reverse the probe of multimeter , Multimeter should indicate resistance value. Now keep one probe in Emitter and other in Base , Multimeter should indicate value "1" and if you reverse the probe Multimeter should indicate the same-: "1".
If the transistor passes above test it is perfectly good.while testing if you hear a buzzer sound then transistor is damaged, you have to replace new transistor. While replacing please note the number written in transistor(Eg BC 547) and replace it with same number.
From the number of transistor we can find it whether it's NPN or PNP type transistor by checking it's data sheet.
Image showing testing of transistor (But it is not in continuity mode)
After testing of transistor, test the capacitor, keep one end of capacitor with one probe and other end of capacitor with other probe, in continuity mode if it indicates short circuit ( buzzer sound), capacitor is damaged and we have to replace the capacitor.same way test the diode also.Replace capacitance of same capacitance(in farad) and voltage rating.In similar way test the diodes also.
So replace the electronic component which has failed and connect the battery again and close the bat. Now the mosquito bat should be working.
First open the mosquito bat by using screwdriver, Inside bat we will find simple power electronic circuit, consisting of battery, Transistor, resistors, capacitors , diodes and small transformer.The basic function of this circuit is to generate very high voltage across output and electric fence so mosquito will die immediately when it came in contact with fence.
We need a digital Multimeter OR Analog Multimeter to check the various electronic components.
Caution: Never keep Multimeter probes directly on the electric fence, it may result in damage to Multimeter and even we may face some shock.
Image showing circuit of mosquito bat
First Remove the battery and test the battery carefully, check voltage of battery, if it is a 3 V(DC) battery, when you check with Multimeter it should show same rated voltage( in fully charged condition), if it indicates 0 or low value then battery is damaged.
After removing battery, now test the electronic components, for testing electronic components keep the Multimter in continuity mode, You will hear a buzzer sound when you one probe is touched with other. In continuity mode of Multimeter we can find short Circuits ,suppose if you test a diode and if you hear buzzer sound then diode is short circuited indicates it is damaged.
Now with the help of Multimeter test all the components, in mosquito bat there is less chance of failing of transformer.so first test all other components
In mosquito bat there is more chance of failing of transistor, so check the transistor and if it is damaged replace it.
How to check the Transistor:
It is better to check the transistor after removing it, So Desolder the transistor from circuit board with help of soldering rod.(Please be careful while using soldering rod,if you have no practice of using it better avoid it using) or use Desoldering tool to remove it carefully.
For NPN transistor Keep one probe(Red) on Base and other(Black) on emitter, Multimeter should indicate some resistance value, when we reverse the probe(Red probe on emitter and Black on Base) it should indicate "1" Next keep probe(Red)on base and other(Black) on collector, Multimeter should indicate value and when you reverse the probe Multimeter should indicate "1" .Now keep one probe in Emitter and other in Base , Multimeter should indicate value "1" and if you reverse the probe Multimeter should indicate the same-: "1".
For PNP type transistor when probe(Red) on emitter and black on base it should indicate resistance value and when black probe on emitter and Red probe on base it should indicate "1".Next keep probe(Red)on base and other(Black) on collector, Multimeter should indicate "1" and when you reverse the probe of multimeter , Multimeter should indicate resistance value. Now keep one probe in Emitter and other in Base , Multimeter should indicate value "1" and if you reverse the probe Multimeter should indicate the same-: "1".
If the transistor passes above test it is perfectly good.while testing if you hear a buzzer sound then transistor is damaged, you have to replace new transistor. While replacing please note the number written in transistor(Eg BC 547) and replace it with same number.
From the number of transistor we can find it whether it's NPN or PNP type transistor by checking it's data sheet.
Image showing testing of transistor (But it is not in continuity mode)
After testing of transistor, test the capacitor, keep one end of capacitor with one probe and other end of capacitor with other probe, in continuity mode if it indicates short circuit ( buzzer sound), capacitor is damaged and we have to replace the capacitor.same way test the diode also.Replace capacitance of same capacitance(in farad) and voltage rating.In similar way test the diodes also.
So replace the electronic component which has failed and connect the battery again and close the bat. Now the mosquito bat should be working.
0 comments:
Post a Comment