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Below is a snapshot of MB102 bread board powersupply that can provide either \$5V\$ or \$3.3V\$ on either rails. We can switch between 5V and 3.3V by adding a jumper as shown. I'm just wondering how simply adding a jumper switches the voltage value. Any help ?

enter image description here

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    \$\begingroup\$ buzz the contacts out. It isn't too hard to imagine that a jumper connects some 5V rail to an output pin on the breadboard... \$\endgroup\$
    – PlasmaHH
    Sep 17, 2018 at 11:35
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    \$\begingroup\$ Ahh @PlasmaHH do you mean inside the PCB there may exist a 5V rail and a 3.3V rail; and this jumper is simply connecting them to the output ? I think I see how this works. Thank you so much :) If you have time and convert above comment to answer, I'd love to mark it best. Thanks again :) \$\endgroup\$
    – AgentS
    Sep 17, 2018 at 11:39
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    \$\begingroup\$ Just to be clear, you're not adding a jumper, you're moving the existing jumper to a different position. \$\endgroup\$
    – Dave Tweed
    Sep 17, 2018 at 12:15
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    \$\begingroup\$ These downvotes are unfair to op. We all started somewhere and undoubtedly asked questions that may be simple to experienced folk. Op is attempting to learn and downvotes for simple questions just dissuade beginners. \$\endgroup\$
    – Passerby
    Sep 18, 2018 at 4:02

2 Answers 2

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The picture below should explain this: -

enter image description here

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    \$\begingroup\$ Dang. Duplication of effort or what? Going for breakfast now. \$\endgroup\$ Sep 17, 2018 at 11:54
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    \$\begingroup\$ It's not a surprise LOL \$\endgroup\$
    – Andy aka
    Sep 17, 2018 at 11:55
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    \$\begingroup\$ You both have been life savers to me so many times XD Wish I could mark multiple answers best! \$\endgroup\$
    – AgentS
    Sep 17, 2018 at 11:58
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    \$\begingroup\$ You can up vote each one, that's the closest thing. \$\endgroup\$
    – Passerby
    Sep 18, 2018 at 3:59
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There are two AMS1117 fixed-voltage regulators on the board (the black SOT-223 packages). The jumper selects one of the two to go to the output.

enter image description here

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    \$\begingroup\$ Is there an echo in here? \$\endgroup\$
    – Andy aka
    Sep 17, 2018 at 11:56
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    \$\begingroup\$ Is there an echo in here? \$\endgroup\$ Sep 17, 2018 at 22:16

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