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Splitting up a voltage source

Discussion in 'General Electronics Discussion' started by kennek, Apr 28, 2014.

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  1. kennek


    Apr 28, 2014
    We have a 24v battery pack as our voltage source for a robot project. We want to use it to run a motor at 24v and also to another motor at only 8v. Is there a way this can be done?
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Hello and welcome.

    First: forget about splitting the battery pack or tapping the 8V from some intermediate connection within the battery stack. Thsi will drain the cells unevenly and lead to early death of the battery since you will not be able (at least not easily) to recharge the cells individually.

    Use a voltage regulator that is suitable for 24 V input and can deliver 8 V at its output. Depending on the current needs a switch mode regulator is probably best suited. Judging from your question I wouldn't recommend that you build your own DC/DC converter - it takes some experience. You can buy ready made (adjustable) modules like this (only one example). You find these modules (or similar ones, also in kit form) at many electronics stores. Observe the necessary current rating!

    Arouse1973 and KrisBlueNZ like this.
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