daokj
Newbie level 6
Hello,
I am trying to reuse a SMPS coming from an old DVD player with internal hard drive. It has among other lines a 12V line (when not feeding anything, multimeter says it actually outputs 11.3V) and a 5.4V (multimeter says 5.2V).
In the original device, those two lines are used to feed a 3.5" HDD - 5V for the HDD PCB and 12V for its motors.
However I did not keep the original PCB to connect a HDD and in my use case I am willing to use the 12V line to feed such **broken link removed**) which is meant to be plugged to 3,5" HDD (for test purposes I use the one of the original device) and a Raspberry Pi.
Now, when I use the power supply which came with the converter (multimeter says it outputs 12,2V), the HDD can be recognised by the RPi.
But when I use the above mentionned SMPS (basically through a modified jack connector), the drive is not properly recognised (and its motors do no seem to work even though the LED of the SATA to USB converter is lighting up).
The converter should get a 12V input, from which it manages to feed the drive in 5V and 12V via the SATA connector.
So I guess the actual voltage of the current supplied by the SMPS' 12V line is too low. From here I wonder (novice questions):
I am trying to reuse a SMPS coming from an old DVD player with internal hard drive. It has among other lines a 12V line (when not feeding anything, multimeter says it actually outputs 11.3V) and a 5.4V (multimeter says 5.2V).
In the original device, those two lines are used to feed a 3.5" HDD - 5V for the HDD PCB and 12V for its motors.
However I did not keep the original PCB to connect a HDD and in my use case I am willing to use the 12V line to feed such **broken link removed**) which is meant to be plugged to 3,5" HDD (for test purposes I use the one of the original device) and a Raspberry Pi.
Now, when I use the power supply which came with the converter (multimeter says it outputs 12,2V), the HDD can be recognised by the RPi.
But when I use the above mentionned SMPS (basically through a modified jack connector), the drive is not properly recognised (and its motors do no seem to work even though the LED of the SATA to USB converter is lighting up).
The converter should get a 12V input, from which it manages to feed the drive in 5V and 12V via the SATA connector.
So I guess the actual voltage of the current supplied by the SMPS' 12V line is too low. From here I wonder (novice questions):
- How comes that it managed to successfully feed the same hard drive in the original device (even though the 5V was supplied by a separate line, and not converted from the 12V as it is now with my SATA to USB converter) ?
- When not feeding anything, the 12V line outputs 11,3V. Once the SATA to USB converter is plugged (with nothing on the other end), i measure 10,9V. Once the hard drive is plugged to the converter, I measure 10,3V. Is the tension supposed to drop like this ?!
- You will find here attached the schematics of the SMPS in 2 parts. I'd rather use that SMPS than the power supply shipped with the converter (which works fine) since I need other lines from the SMPS (-30V, VF+, VF-) to feed other modules from the original device. What would be the best way to get a tension closer to actual 12V ? Creating an additional rectifying circuit to actually feed 12V to 12,2V ? From the 12V line (named PC_12V where the 12V is made from 15V using 278R12, but currently outputting less than 12V)? From the 33V line?
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