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Multifunctional up/down counter

Velleman K8035: Multifunctional Up/Down Counter

Velleman K8035

Enlist the K8035 to help you count people, parts, scores, and any other numbers you need to keep track of. The board counts through pushbuttons or external pulses and counts both up and down. An internal oscillator on the board allows it to keep time, as well.


  • Display modes: normal or time (hh:mm and mm:ss)
  • Programmable pre-set value with equal output
  • Self diagnostic at power up
  • Comes with easy board-to-wire connector (20cm wire)


  • Counter input voltage: 3...12V DC (normal dry contact also possible)
  • EQUAL output: 5V DC / max. 50mA
  • Max. counting speed: 200 / sec. (2 / sec. with long debounce delay)
  • Max. count: 4 digits (9999 / 23h59m / 59m59s)
  • Power supply: 9 - 12V DC or transformer 2 x 9V AC / 300mA
  • Power consumption: 150mA max.
  • Dimensions: 4.9 x 3"

Additional Information

Difficulty Level 4


Parts list
English assembly instructions through illustrations, pictures, etc.

Assembly instructions
Written multilingual manual explaining how to build the kit

Info Sheets

Resistor colour code

Overview of Velleman modules that are equal to D.I.Y Kits
This sheet is useful when you want to know which modules you could find in the do-it-yourself range of Velleman Kits and minikits.

 Warning: this product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov/product