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kraken @lemm.ee
Posts 9
Comments 25

Any recommended products for Network Attached Storage?

Hoping to set up a general location to throw files.

It might be used as a storage dump for Plex too..

Recommendations?

Edit: the synology recommendations have won out. Went with the DS923+. Thanks for all of the thoughtful recommendations!

36

What's your go-to tool for weed management?

9
Will an AC to DC converter work if the input was DC instead of AC?
  • Good explanation.

    As @directive0 said, the diodes (triangles in the above circuit) only conduct in one direction.

    On the AC wave (top left) in the positive half, two diodes are conducting. In the negative half, the other two diodes are conducting.

    The two sets of diodes are connected so that the positive half and the negative half of the sine wave come out on the same line. Since the waveform on the right of the image is all positive (ignore the bumps), it is considered DC.

    a photo is worth 1000 words

  • Will an AC to DC converter work if the input was DC instead of AC?
  • You could get an output, but if you want to take 100Vdc and turn it into 10Vdc.. it will not do this... for this you will need a buck, sepic, buck-boost, cùk, resonant, or some other converter..

    In the case of the rectifier:

    if you look at a simple AC to DC converter (half-wave rectifier) either output = 0 volts or output = input - conduction losses, depending on how you polarized the DC source.

    In another circuit (full wave rectifier), the diodes will be polarized such at two will allow current flow. output = input - conduction losses

    If the rectifier is something more complex (12 pulse rectifier).. this circuit relies on transformers. If you put DC on the primary of the transformer then the output will be 0 volts and thus the rectifier output will also be 0 volts. In this example I've ignored the fact that the transformers have 3 terminals and the DC source would only have 2.

    I'm less knowledgeable of more elegant rectification methods (such as active rectification)...

    Interestingly.. the fundamental DC to AC converter (inverter) is the same circuit as the full wave rectifier, with the diodes replaced with controllable switches (SCRs, IGBTs, IGCTs, MOSFETs, ect.)

  • how can doctors be confident in saying "we got all of the cancer"?

    When I watch TV I often hear the doctors (actors) assure patients and their family that they got "all of the cancer" during removal surgeries.

    In my mind.. I always thought that cancer was a lump of cells.. multiplying uncontrolled.. and at some point along its margins, it borders normal tissue.

    How can you possibly cut perfectly between normal tissue and cancerous tissue?

    7

    Meet B

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    2
    Male Fashion Advice @lemmy.world kraken @lemm.ee

    Got some new boots. What do you guys think?

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    0
    Ask STEAM Science/Engineering @lemmygrad.ml kraken @lemm.ee

    Why are Silicon and Germanium considered elemental semiconductors, but not Carbon?

    Engineer by profession/education, but semiconductor fundamentals is a huge gap in my education (long story). I bought a textbook and have been following a lecture series on youtube... but don't have anyone to ask my questions to.

    Thanks! :)

    8
    Hampton Roads @lemm.ee kraken @lemm.ee

    Welcome..

    I'm really hoping that this can be a spot for folks in the Hampton Roads area to connect and discuss local happenings..

    I'm a first time moderator... please be patient with me!

    0

    Dinner tonight. I may have over cooked the potatoes..

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    3

    What are you guys enjoying tonight?

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    0