I've been working very hard to make electronic block tutorials for my youtube subscriberes, as well as potential buyers of my electronics learning board. The board has many different blocks, and there are 11x tutorial videos that I have to show you how each of them work. Each tutorial has a theory and lab section, so that the user can work through the theory, and witness the result! This is a VERY simple, and introductory circuit. The upcoming instructables will get more complicated, and MUCH more interesting!
This project is the first of twenty (Minimum) that this project board is capable of. You can take the tutorial information learned in this instructable, and put it to use on your breadboard! We will be discussing the 7805 5v regulator IC, the 555 Timer based monostable multivibrator circuit, and finally, a transistor based piezo buzzer driver circuit. By using these three blocks, you will be able to create a buzzer doorbell that is activated by a button. You can change the duration of the doorbell by adjusting the values of passive components (A resistor and a capacitor) on the 555 timer monostable circuit. Each clock listed in this instructable will help you to create the following circuit. I demonstrate on the learning board, but you can do it all on your own with a breadboard!
Step 1: The 7805 5v regulator
Our digital circuitry may very well be sensitive to over-voltage. While the 555 timer circuit can handle a power supply of 5v, the 5v piezo buzzer cannot. Most projects like this would require a 9v battery. How to we easily regulate down to 5v? Easily! With the help of our trusty and inexpensive friend, the 7805 5v regulator IC. This IC has an input port (1), a ground port (2), and a regulated output port (3). The power supply circuit, including the 7805 is talked about in depth in the below video! In order to regulate down to 5v, you need at least 7VDC at the input pin. If after watching this video, you have any questions, please do not hesitate to post them below! I'll do my best to answer!