It would be wonderful if senior students and laboratory supervisors built these units so that they could be used in their laboratories by freshers.
Analog System Lab Starter Kit ASLKv2010 http://www.uniti.in/teaching-material/analog-system-lab-starter-kit
Step 1: Aj-SigGen-PS
This USB connected unit implements a microcontroller based DDS Signal Generator providing Sin and Triangular waveforms with adjustable magnitude and offset up to 50 kHz. TTL and 1 V square waves are simultaneously provided. Additionally ± 12V and a variable +2 to 7V output with a total capacity of 1W is provided to power external circuits under test.