I have modified the WebPal to accept a 3.5" hard drive internally, but it will not power up.
I'm assuming it needs 12 volts in addition to 5 volts.
I read the instructions from bigbrd's website on how to connect the power adapter, (He was using a 2.5" HD) but apparently the 2.5" HD only requires 5 volts.
Is there a 12 volt connector on the motherboard or does it need to be powered externally?
There is no 12V supply internally and it is very marginal to create one from the AC input for the HD because the current
consumption of the HD 12V is not negligible. (typical required current amount is usually specified on the HD)
It may be possible to use a flyback regulator (an IC like LM2585-12 and some R/L/Cs) to generate
12V internally but that will be pretty techy and not sure if the 5V supply would provide enough power to support 12V generation
although the switching mode DC-DC converters have pretty good efficiency.
Most 3.5" HDs do require 12V supply. Height-wise, new half inch drives will fit into webpal case without modification.
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