Voltage divider – Setting a fractional voltage

Voltage dividers made up of resistors are pretty simple. Series resistors with a voltage across them, split up the voltage in proportion of their resistance.

Quicker lesson Brief fixed resistor voltage divider circuit

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Simple fixed value resistor trimpot potentiometer voltage divider schematic diagrams by electronzap electronzapdotcom
Simple fixed value resistor trimpot potentiometer voltage divider schematic diagrams by electronzap electronzapdotcom

Basic properties

  • You do not power things with this voltage unless they need very little current. You typically feed the voltage divider output  voltage to an input of some kind that just looks at the voltage, and doesn’t need much if any current.
  • Higher value resistors will have more of the voltage across them than the lower value resistors that they are in series with.
  • Equal value resistor will split the voltage equally.
  • Variable resistor and potentiometers (trimpots) can give whatever voltage you want, within the range they are made for.

Diagram

Basic electronics circuit fragments and simple circuits 3 resistive voltage divider using fixed trimpot and light dependent resistor LDR basics diagram by electronzap electronzapdotcom
Basic electronics circuit fragments and simple circuits 3 resistive voltage divider using fixed trimpot and light dependent resistor LDR basics diagram by electronzap electronzapdotcom

Video

Voltage divider basics with fixed equal value resistors and variable trimpot for quick videos 10

More detailed voltage divider lessons at 004 Voltage dividers-trimpot-LDR light dependent resistor-fixed resistor

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More topics:

Other basic electronics topics that you should know before moving on to more advanced topics.

555 timer is an integrated circuit (IC). Being an IC, it has complex circuitry combined in a single package with external pins/terminals to connect to other circuitry. You can easily make all kinds of fun circuits with just a 555 timer and the components covered above, so I think it’s a good component to learn next.

Transistors will probably be the most challenging components to learn. Understanding them will help you understand all of electronics much better, and help you the most in being creative while designing your own circuits.

Other topics:

These pages are still being compiled.

Circuits covered more quickly series:

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