Hello Jan !
I am planning to unbrick a seagate hard drive and my search through relevant formus led me to a guide offering a solution using the Pololu 23201a Serial adapter and thus your site.
I did read your work on destructive LC voltage spike. Quite enligthing I must say and congratulations on your will to offer this informartion to the public.
I would like to ask for your kind advise/guidance on the following issues: (I am a Mechanical Engineer, I have no practical experience on electronics but as I had taken a few general courses on electrical engineering I hope I will be able to try to follow any reply)
1) with reference to your article page 17 of 18, some experiment is required to determine the size of the external capacitor to be used. I understand that some voltmeters can measure capacitance also. Considering that I am a total begginer, if I buy such a voltmeter, is there a practical way to determine/estimate the PSU (with wires) LC figures in order to select the size of the external capacitor? I can also open the cover of the PSU to try to read its components particulars, if this helps, at least for capacitors, for inductance I do not sure at the moment how to read them.
2) I have the option to power the 23201a adapter either with 3.3V or 5V from the PSU . Apart from the volume of the capacitor for which I have no problem, Can I use as much larger capacitor I can find? any negative implication?
3)In case I use a battery (3.3V or 4.8V) and select a much larger capacitor (2 or 3 times then the 330uF) do you see any potential negative implication on this? (is it possible the battery energy be drained quiclky by the capacitor?)
The PSU I intent to use has the following particulars:
Power output : 130W (max 230W)
Length of wires about 50cm each made of 20AWG (a few 22AWG also)
I am sorry for this long post, I just try to take into consideration all available parameters before implementing the procedure.
Thank you very much for your time!! Best regards!!