impulsan

1. (technical) pulse; pulsed
   Kupio sam novi impulsni punjač za telefon. — I bought a new switching charger for my phone.
   Uređaj koristi impulsni laser. — The device uses a pulsed laser.
2. (of a person, action) impulsive
   Bio je impulsan i često je žalio zbog svojih odluka. — He was impulsive and often regretted his decisions.

In the technical sense it is usually in the definite form impulsni; for a person impulsivan is more common.