Day 4: (Mon Sep 9) Basic Electronics

Notes for 2019-09-09. See also the Fall 2019 Calendar.

Notes from Day 3

I apologize for not getting to the laser-cutting discussion last time, hopefully my notes on DXF export helped and the staff covered the rest.

Agenda

  1. Administrative

    • Is anyone still not qualified on the laser cutters?

    • Please note cubbies for storage.

  2. Assignments

  3. In-class

    • Quick check-off demos. Please show your project to your tablemates while I am coming around.

    • Discussion of basic electronics theory.

    • Demos of lab equipment: DMM, oscilloscope.

    • Hand out the kit box and more of the components. See Course Kit for inventory.

    • Try out Exercise: Continuity Tests.

    • Try out Exercise: Read Switch Input.

Figures

../_images/CKS-Uno-Shield-1-RevA-top.png ../_images/CKS-Uno-Shield-1-RevA-schematic.png

Essential Theory

../_images/kcl.png

Kirchhoff’s current law (KCL).

../_images/kcl2.png

Kirchhoff’s current law (KCL).

../_images/kvl.png

Kirchhoff’s voltage law (KVL).

../_images/ohmslaw.png

Ohm’s Law.

../_images/resistor-color-code.png

We use 1/4-Watt resistors with axial leads. The part value is indicated by the colored bands.

../_images/voltage-divider.png

A voltage divider, the essential topology for most of our circuits. For more detail, please see Exercise: Voltage Divider Review.

Essential Circuits

../_images/switch-with-pullup.png

A switch with a pullup resistor, analyzable as a voltage divider.

../_images/LTH-1550-package.png ../_images/LTH-1550-photo.jpg
../_images/LTH-1550-iso-sketch.png
../_images/LTH-1550-circuit-sketch.png

A photointerruptor circuit includes a current-limiting resistor for the LED and a bias resistor for the phototransistor.

../_images/IRF540-speaker.png

A single-channel unidirectional power driver using a IRF540 MOSFET. For more detail, please see Exercise: Unipolar Drivers.

../_images/IRF540-speaker-pictorial.png

A more graphical representation of the IRF540 MOSFET circuit.

Essential Lab Equipment

../_images/breadboard-connections.jpg

Solderless breadboards are our workhorse for electronics prototyping. Each short row of five holes connects together by an internal metal clip and forms a single circcuit node. Each long bus row is a node. Please disregard the +/- bus labels on your breadboards.

../_images/CSI550S-Lab-Supply.jpg

Three-channel lab power supplies.

../_images/Extech-EX330-multimeter.jpg

Digital multi-meter (DMM).

../_images/DS1102E-oscilloscope.jpg

Digital oscilloscope. For more details, please see Oscilloscope Guide.