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Velleman MK138: Thermostat Minikit

Velleman MK138

The Velleman MK138 Thermostat Minikit (Soldering Required)

The Velleman MK138 Thermostat minikit is a great DIY kit for building your own fan controller, heating controller, temperature alarm or various other applications where you need simple low cost temperature control. The 41° to 86°F temperature range is adjustable using a potentiometer. The circuit for this DIY electronic kit uses an NTC temperature sensor and has a relay output with LED indication.

Also available as completely mounted module Velleman VM137.



  • Temperature range: 41°F to 86°F approx.
  • Relay power rating: 24V DC/AC 3A
  • Power supply: 12V DC / 100mA
  • Dimensions: 2.1 x 2.4 x 1.1"


Additional Information

Difficulty Level 2


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.

 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