Powering electronics

Electronic circuits and electrical loads need to get electricity (electric power) in some way or another. Therefore, this page is devoted to introducing ways of providing electric power.

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Common power sources:

There’s 2 ways that most individuals provide power to their electronics.

  • Regulated voltage/current supply (fixed or variable).

Affiliate link ad. Used in my videos. I mostly like this supply because I can easily film it alongside my circuits, but it is also extremely portable, and easy to fine tune voltage and current limits. So I think it is a good buy for anyone who doesn’t want to stay limited to working at a bench.

Affiliate link ad. This is the adapter that I use to power random things and the commonly available breadboard power supply. The breadboard power supply, plugs into the power rows of a standard breadboard, a higher voltage (9 works well) is plugged via barrel plug, and a jumper at each row allows you to pick 0v, 3.3V or 5V output to the power rail.

Affiliate link ad. Easy 3.3V/5V power for breadboard if you have an adapter like this one above. These burn out easy if you short them, so I recommend getting a pack since they are only about $2 each.


  • Voltage and maximum current output may be adjustable
9V battery with snap wires to power current limiting resistor with LED circuit on breadbard diagram by electronzap electronzapdotcom
9V battery with snap wires to power current limiting resistor with LED circuit on breadbard diagram by electronzap electronzapdotcom

Second commonly used power source is batteries.

  • Voltage of a battery cell, depends on it’s chemistry and how charged it is
  • Fully charged = The battery’s maximum voltage, probably dangerous to keep charging it.
  • Discharged = The battery’s voltage has dropped to an unusable or is close to, if not exceeding an unsafe level for many rechargeable batteries. Current production is reduced.
  • Primary = A battery that is not rechargeable
  • Secondary = A battery that is rechargeable

Commonly used alternative sources of electric power.

These are highly situational. Therefore, they will not be covered in detail on this page.

  • Solar
  • Generator – Wind/hydro/hand cranked/etc.
Related videos:

Using the links to watch the video directly on YouTube, which will be in a new tab, is more helpful than watching the embedded video directly.

Too much voltage wastes energy demonstration using simulated li ion 18650 batteries electronics topic

How I am testing my new ROMOSS portable battery packs capacity with USB multimeter by electronzap

DROK one button multimeter first test by electronzap
In circuit multimeter unit I advertised below.

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