how to install protection from short circuit ?

Using Arduino General Electronics
1

hello guys,
i would like to know please where exactly should i put the diode for short circuit protection on atmega328P, should i out it just between the +5 and the VCC pin ? or what is the protection circuit that should be added ? i need something for thruhole not for smd

2

A polyfuse is the way to go

3

KenF:
A polyfuse is the way to go

a diode won't work ? i need something for thruhole not for smd

4

The use of a sacrificial diode to supply your board could work but it's a fine line between being useful protection OR just an irritating point of failure.

5

What current are you looking to protect against?

6

What you need to do is to explain what you mean by "short circuit protection".

Against precisely what circumstance do you wish to protect?

7

CrossRoads:
What current are you looking to protect against?
http://www.digikey.com/product-search/en?pv16=14762&FV=fff4000a%2Cfff80390&k=ptc&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25

i am supplying the circuit with 9V to a 5V voltage regulator which goes to the chips (atmega328P, shift registers etc ... ) and 9V going to the RF transmitter

8

Paul__B:
What you need to do is to explain what you mean by "short circuit protection".

Against precisely what circumstance do you wish to protect?

against a reverse battery for example

9

firashelou:
against a reverse battery for example

I don't think that's referred to as a "short circuit", but no matter: I Googled thus "using a diode to protect reverse polarity" and got the best part of 500k hits. Seems the easiest way is just to put a diode in series with the battery and load....

10

JimboZA:
I don't think that's referred to as a "short circuit", but no matter: I Googled thus "using a diode to protect reverse polarity" and got the best part of 500k hits. Seems the easiest way is just to put a diode in series with the battery and load....

ok so it must simply goes between the +V from the battery and the input of the voltage regulator ? or between the output of regulator and the atmega328P Voltage pin ?

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