Recitation 1 – Basic Circuits

Exercise 1:

  • Working in pairs, create three simple circuits on a breadboard based on the circuit diagrams below and take photos and notes to post later on the documentation blog (we will go over documenting your work in class).
    • The first circuit uses a voltage regulator, buzzer and a switch.
    • The second circuit uses a voltage regulator, resistor, LED and switch.
    • The third circuit uses a voltage regulator, resistor, potentiometer, LED and switch.
  • In your blog post please answer some of the following questions:
    • Why was it important to use a voltage regulator?
    • Why did you need or not need resistors in your circuits?
    • We used pushbutton switches in these diagrams. Are there any switches that we interact with everyday that do not require us pressing a button or an on/off switch with our hands?
  • Materials:
    • 1 * Breadboard
    • 1 * LM7805
    • 1 * Buzzer
    • 1 * Push-Button Switch
    • 1 * 220 ohm Resistor
    • 1 * LED
    • 1 * Variable Resistor
    • 1 * Power Supply and Leads
    • Hookup Wires

Here are some helpful diagrams to help you understand your components better:

LED Pinout:

Image from Tweaking4All.


LM7805 voltage regulator pinout:

Image from Electronics4u.


Variable Resistor:

Push-Button Switch. Notice that some of the leads are always connected to each other.

Image from Razzpisample

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