Op Amps, Diodes tom epplin: Intro to NI Multisim 10.1

Getting Started with Multisim (CEC) > Engineering > NationalInstruments Multisim 10.1

Getting Started with Multisim (CEC)

Adding Multisim Components > Place Component

Adding Multisim Components > Group Basic

Adding Multisim Components > Capacitor 300nF Ok (Objects may be rotated using Edit -> Orientation)

Adding Multisim Components

> Place Wire (or Ctrl+Q) (Note that red dots appear where successful junctions have been established)

Adding Multisim Components Don’t forget to place an appropriate reference ground: > Place Component Sources Power_Sources oGround

Example Problem 1: Op Amp Input Output V2 V1 V3

Example Problem 1: Op Amp Solving manually: V1 = (12V)(1k Ω /3k Ω ) = 4V V2 = V1 = 4V (12V – 4V)/3k Ω = (4V – V3)/6k Ω V3 = -12V

Example Problem 1: Op Amp Solving using Multisim: Compare voltages in circuit using an oscilloscope: > Simulate > Instruments > Oscilloscope Attach oscilloscope terminals across voltages to be compared:

Example Problem 1: Op Amp Solving using Multisim: Double-click on the oscilloscope to bring up its display, and hit the green play button in the Multisim toolbar

Example Problem 1: Op Amp V3 = -12V

Example Problem 2: Diode Input Output V1

Example Problem 2: Diode Solving manually: Try top diode conducting: Then, in ideal case (no loss through diode), V1 ≈ 3V If V1 = 3V, then the middle and bottom diodes are not forwards- conducting …No contradictory assumptions, and all voltages complicit V1 ≈ 3V

Example Problem 2: Diode Solving using Multisim:

Example Problem 2: Diode V1 = 2.7V (real diode properties used)