how to convert frm 2.5V to exact 5V? | Projects › Projects › how to convert frm 2.5V to exact 5V? This topic has 2 replies, 3 voices, and was last updated 11 years, 11 months ago by khader pasha. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts June 12, 2011 at 8:46 am #999 thanikaiParticipant hi guyz, any idea to vonvert 2.5V to exact 5V… the voltage frm output port is 2.5V someting which connected to RELAY.. but 5V is needed to activate that relay… June 14, 2011 at 7:51 pm #6343 mohammedParticipant THAT IS T wysiwyg_imageupload:1125: HE WAY…. June 15, 2011 at 1:30 am #6345 khader pashaParticipant hi u can use the 2.5v to drive a transistor(npn), give 5v supply to its collector and connect the relay coil to its emitter. u will be able to switch the relay. Author Posts Viewing 3 posts - 1 through 3 (of 3 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In