Decades ago, in college, they made us build and calibrate our own function generator, oscilloscope, and so forth from various boards and parts, as well as pains

Decades ago, in college, they made us build and calibrate our own function generator, oscilloscope, and so forth from various boards and parts, as well as painstakingly document the creation and testing of these devices. I still have the rather thick lab book. I can only imagine how much more complex the situation is now!