004 Voltage dividers-trimpot-LDR light dependent resistor-fixed resistor

Voltage dividers output a fraction of the voltage across them.

Diagrams

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
Beginner electronics variable resistor trimpot voltage divider component basics by electronzap electronzapdotcom
Beginner electronics variable resistor trimpot voltage divider component basics by electronzap electronzapdotcom

Video:

Electronics course 4 Voltage dividers using fixed light dependent LDR and trimpot resistors

How to make a variable resistor or voltage divider using a trimpot trimmer potentiometer

Basic properties

  • Voltage dividers make a nice voltage signal but a very poor voltage source. Use an amplifier, such as a transistor, or better yet, an op amp, to boost the power provided by the voltage.
  • 2 equal value fixed resistors connected in series across the power supply, will give you 1/2 of the supply voltage at the output. 3 equal value resistors will give you 1/3 of the supply at the output closer to ground, and 2/3 of the supply voltage at the output closer to the positive side of the supply.
  • Trimpots and other potentiometers are made specifically to be adjustable voltage dividers. The output voltage will depend on where the wiper is turned to. Turning the wiper adds resistance to one side of the power supply while also reducing resistance to the other side of the power supply.
  • Light dependent resistors LDRs have a variable resistance that depends on how much light is falling on them. They are commonly used to replace one fixed resistor in order to make a light dependent variable voltage divider. Keep in mind that really bright light will bring their resistance to almost zero ohms, so I recommend adding extra resistance in series with it as needed to prevent too much current flow.

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