Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

do my idea work? building power for my harddisk

Status
Not open for further replies.

cpteoh26

Junior Member level 2
Joined
Feb 16, 2009
Messages
20
Helped
2
Reputation
4
Reaction score
0
Trophy points
1,281
Activity points
1,509
hi all. i have a USB-SATA converter. but unfortunately the power supply died yesterday.
anyway, i am thinking, is it possible i create my own power supply for my harddisk.

i take the 230Vac, step down to 20Vac and rectifier and filter with capacitor.
from there, i should have 20Vdc.
i then connect them to 7812 and 7805 voltage regulator chip, to get 12Vdc and 5Vdc supply respectively.
finally i just connect them to molex to SATA supply cable.
well, i can do all these for below USD$5. shop selling the power supply adaptor for USD$15. therefore, i actually save USD$10, and it is my insterest do DIY electronic work.

anyway, is my idea above work, and safe to use? well, definitely, i don't want to burn my harddisk down.
or, is it safer and more secure to just buy a new power adaptor at USD$15?
hope sifu and pro here could advise me please.

thanks.
 

pranam77

Advanced Member level 5
Joined
Apr 22, 2008
Messages
2,777
Helped
553
Reputation
1,104
Reaction score
368
Trophy points
1,363
Location
INDIA
Activity points
16,403
I would suggest you to buy a new power supply. Coz the 7805 and the 7812's will deliver a max of 800Ma current in practical, that too with good heat sinks mounted. You may boost the current with a high current regulator circuit as mentioned in the device datasheets. Naturally the drive may sink more than an amphere of current during some phases of its operation which may prove fatal to the 78's or the drives. Cheers
 

    cpteoh26

    Points: 2
    Helpful Answer Positive Rating

cpteoh26

Junior Member level 2
Joined
Feb 16, 2009
Messages
20
Helped
2
Reputation
4
Reaction score
0
Trophy points
1,281
Activity points
1,509
hi
well, i have another idea on build power supply..
i have one laptop charger, which supply 18Vdc 4.8A..
well, could i use diod to step down the voltage to somewhere near to 5Vdc and 12Vdc and use it??

please guide me.
thanks.

 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top