DIY Short Circuit (Overcurrent) Protection

In this project I will show you how to create a simple circuit that can interrupt the current flow to a load when the adjusted current limit is reached. That means the circuit can act as an overcurrent or short circuit protection. Let's get started!

The video gives you all the information you need to recreate the protection circuit. In the next steps though I will give you some additional information.

Here you can find a parts list with example seller (affiliate links):

Aliexpress:

1x Relay (12V one with 2 changeover contacts): https://s.click.aliexpress.com/e/_dXytThh

2x PCB Terminal: https://s.click.aliexpress.com/e/_dYbstfZ

1x LM358 OpAmp: https://s.click.aliexpress.com/e/_d6VP6J1

2x BC547 NPN Transistor: https://s.click.aliexpress.com/e/_dU81lmT

1x 5mm green LED: https://s.click.aliexpress.com/e/_dV63r7D

1x 1N4007 Diode: https://s.click.aliexpress.com/e/_dYR45Bh

1x Tactile Switch (NC): https://s.click.aliexpress.com/e/_dXIIMcP

6x 1kΩ, 2x 20kΩ Resistor: https://s.click.aliexpress.com/e/_dTPpXjt

1x 10kΩ Trimmer: https://s.click.aliexpress.com/e/_dTFyPv5

1x 0.1Ω Resistor: https://s.click.aliexpress.com/e/_dZKdSGL

Ebay:

1x Relay (12V one with 2 changeover contacts):http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x PCB Terminal: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x LM358 OpAmp: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x BC547 NPN Transistor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 5mm green LED:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 1N4007 Diode:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x Tactile Switch (NC):http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

6x 1kΩ, 2x 20kΩ Resistor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 10kΩ Trimmer: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x 0.1Ω Resistor: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

Amazon.de:

1x Relay (12V one with 2 changeover contacts): http://amzn.to/2uK2t8g

2x PCB Terminal: http://amzn.to/2viTnkl

1x LM358 OpAmp: http://amzn.to/2uNMsN6

2x BC547 NPN Transistor: http://amzn.to/2vj6qCy

1x 5mm green LED: http://amzn.to/2vbPfSn

1x 1N4007 Diode:http://amzn.to/2uO2kiL

1x Tactile Switch (NC): -

6x 1kΩ, 2x 20kΩ Resistor: http://amzn.to/2uNJ4BH

1x 10kΩ Trimmer: http://amzn.to/2uKc9j5

1x 0.1Ω Resistor: http://amzn.to/2eY98qa

Here you can find the schematic of the circuit along with pictures of my finished perfboard layout. Feel free to use them as a reference for your own circuit.

You did it! You just created your own short circuit (overcurrent) protection circuit!

Feel free to check out my YouTube channel for more awesome projects:

http://www.youtube.com/user/greatscottlab

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