The first commercially available balloon cut down hits the shelves

Hexpert, the maker of the Zlog 7 flight computer has added a balloon cutdown / high voltage switch board to it’s offering to the HAB community.


This nylon cord cutter module takes a logic level voltage input and uses it to switch a high current circuit.  It was designed to switch a small 4-cell AA or NiCd battery pack to heat up a nichrome wire that would cut through a nylon or polyester cord to separate a payload from a weather balloon.


The key features of the module are:-

  • Switch up to 25 volts, and 10 amps.
  • Control voltage input ranges from 3.3 to 20 volts.
  • Screw terminals for high current source (battery pack) and nichrome wire (or other load).
  • Control input designed to mate with ZLog-7 port J11 (requires firmware 1.4 running on ZLog-7 for altitude triggered control).
  • 1.35″ x 0.8″ x 0.5″ (34 mm x 20 mm x 12 mm).
  • 4 grams.
  • Includes 1 meter nichrome wire. Recommended nichrome loop length of 2.3″ (6 cm) works well with 4-cell NiCd pack.

For more information go to


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