Short circuit indicator Using NPN Transistor BC547 Full Making Project-27 #ataltinkeringlab #project
Channel: Erole Technologies Homemade Engineer
Date: 02/11/2023

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Introduction:
Short circuit is a condition, in which the input terminals of a power supply, get in electrical contact with each other, causing huge current flow. 
This leads to very large heat generation, which can damage the system, and also pose a threat to people nearby it. 
Thus short circuit condition is necessary to be detected, and be attended immediately. 
Short Circuit Indicator Project, does the task of detecting the short circuit in a circuit automatically. 
We have demonstrated the short circuit in our circuit board, using a wire piece, which has very low, close to zero value of resistance, thus creating a short circuit at the load side.


Now we will connect a 9 volt battery, and test our project.
It gives a warning indication, if there is a short circuit in the assembled board. 
If the circuit board is OK, Green LED lights indicating that power supply is normal. 
If there is a short in the PCB tracks, or pins of components, Green LED turns off, and Red LED indicating the short circuit.


these are the components, which are needed in this project.
1 NPN, transistor, BC 5 4 7.
1 PNP, transistor, BC 5 5 7.
1 2.2 kilo ohm resistor.
1 10 kilo ohm resistor.
3 1 kilo ohm resistor.
1 diode, 1 N 4 0 0 7.
1 red LED.
1 green LED.
9 volt battery.
PP3 battery connector.
on off, rocker switch.
1 zero PCB.
4 screw with nuts.
and 4 plastic spacers.