Si ka duwan mashiinka sawirka siliga caadiga ah, mashiinka sawirida fiilada tooska ah ee tooska ah wuxuu qaataa tignoolajiyada kontoroolka beddelka soo noqnoqda AC ama nidaamka xakamaynta barnaamijka ee DC iyo bandhigga shaashadda, oo leh heerar sare oo otomaatig ah, hawlgal ku habboon iyo tayada sare ee badeecadaha la sawiray. Waxay ku habboon tahay in la sawiro fiilooyinka birta ee kala duwan oo leh dhexroor ka yar 12 mm.