how to protect overvoltage or current in computer hard disk

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how to protect overvoltage or current in computer hard disk supply lines? 12V and 5V, assuming i have a crappy PSU.

thank you guys!
 

Re: how to protect overvoltage or current in computer hard d

thank you for your reply, any other simple way?
 

Re: how to protect overvoltage or current in computer hard d

a simpler way , i havent tried this but
you can put 5V and 12V zener diodes on the supply lines on the hdd,if the voltage overshoots the zener will short and the powersupply will not turn on
 

i will suggest a better power-supply or UPS because overvoltage or current will damage or device like CDROM, VGA, MB.
 

Re: how to protect overvoltage or current in computer hard d

how can we use lm339 comparator for supply protection?
 

Re: how to protect overvoltage or current in computer hard d

The LM339 circuit can be used only for monitoring circuit, for a complete schematics you need to add some external elements.
 

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