Introduction to electric amplification

Make your own lock-in amplifier and sonar vision aid for the blind

For this lab you will make your own wearable lock-in amplifier and vision aid for the blind.

You will use the system you previously made for lab 1, and extend it by building the world's smallest lock-in amplifier as its input stage. This will be used for sonar sensing devices such as the seeing aid for the blind. This system will also form the basis for the electric self-driving vehicle of future labs.

For Lab 2, we will make the following:

Wearable lock-in amplifier;
Wearable vision system for the blind; or (optinally)
Wearable heart monitor.

Instructions: See the Instructable here: https://www.instructables.com/id/Miniature-Wearable-Lock-in-Amplifier-and-Sonar-Sys/

Don't worry if you can't finish all of it.

You can get full marks for finishing just the simple part of it!

Grading

Assembly of the lock-in amplifier prototype on breadboard, neatly wired, and well-done, 4/10

Wearable sonar system using the lock-in amplifier, 4/10

Capture and processing in Arduio of the output of the lock-in amplifier, 2/10

Bonus marks (for a grade higher than 10/10): Possible ideas:

Complex-valued lock-in amplifier;
X-Y plot of the complex-valued lock-in amplifier;
Demonstration of computer vision using machine-learning, e.g. as per Chapter 2 of the course texbook;
Demonstration of ultrasound heart monitor using machine learning.