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Electronic decision maker

Velleman MK135: Electronic Decision Maker Minikit

Velleman MK135

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Velleman MK135 Electronic Decision Maker Minikit

Feeling undecisive or need someone to make a decision for you? The Velleman MK135: Electronic Decision Maker Minikit is a fun and easy DIY minikit that helps you make decisions. Ask it a question, push the button and the yes or no LEDs start alternately flashing. Gradually the flashing slows down until only one LED remains lit, answering your question with a green LED for yes or a red LED for no.

The MK135 includes a battery holder that attaches to the circuit board. The circuit is low power and operates on a 9V battery (not included).


  • Helps you make decisions based on yes or no questions
  • Fun, easy DIY electronic project. Soldering and assembly required
  • Auto power-off


Low Power Consumption 1mA idle, 8mA in use
Power Supply 9V battery - Not Included
Dimensions 2.2 in. x 1.2 in. 1.4 in.

Additional Information

Difficulty Level 2
  1. Fun kit, great gift review by Chuck on 1/7/2019

    Worked great and made a fun Christmas gift for my grandma's girlfriend.

  2. good item review by rb on 11/18/2016

    took only a few minutes to solder, works as advertised. transistor 1 needs to be isolated more or covered with something. touching it while the decision is being made ensures the decision is always no. it is right next to the start button.

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Assembly manual

Info Sheets

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.

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 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