Juya juyi wani nau'in maɓalli ne wanda ke jujjuya abin hannu don sarrafa kashe babbar lamba.Hakanan akwai nau'ikan sifofi guda biyu na jujjuyawar jujjuyawar, wato, tsarin naúrar igiya guda ɗaya da tsari mai tsayi da yawa.Ana amfani da na'ura mai juyi juyi sau da yawa tare da rotary potentiometers a aikace-aikace, yayin da Multi-Pole Multi-position Rotary switches galibi ana amfani da su don sauya yanayin da'irar aiki.