Dictation machine

src: www.officemuseum.com A dictation machine is a sound recording device most commonly used to record speech for later playback or to be ...

Digital video recorder

src: visioncame.com A digital video recorder ( DVR ) is an electronic device that records video in a digital format to a disk drive, USB fl...

Digital video recorder

src: visioncame.com A digital video recorder ( DVR ) is an electronic device that records video in a digital format to a disk drive, USB fl...

555 timer IC

src: i.ytimg.com The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications...