During the lab hours, I did experiments with different components. In this blog, I will describe my learnings while playing with different components.

Voltage Regulators

I conducted experiments on couple of voltage regulators (7805, LM33DV, LM317). I got some interesting findings regarding the input-output voltages of the voltage regulators. I had given input voltage of 15V DC from DC power jack. The different output voltage I got for different regulators are as follows.

Input DC power supply

Output voltage for 7805 voltage regulator

Output voltage for LD33V voltage regulator

Output voltage for LM317 voltage regulator

Important Findings

• When I applied input voltage as 3.3V to LD33V , I didn't get the expected output voltage of 3.3V, but I got 2.5V. Later when I checked the datasheet I read in the input specification that Min. input voltage should be 4.3V. By using the logical analysis, I thus recognized we can get output maximum 0.8V lesser than the input voltage.
• Different voltage regulator work with different pin configuration.

LEDs

I conducted various experiments using LEDs to make them brighter or dimmer with different resistor values. For eg. 220 Ohm, 2.2KOhm, 10Ohm.

Changing the resistance value to change the brightness of the LED

Brightness of the LED for different series resistors (2.2KOhms)

Brightness of the LED for different series resistors (Parallel combination of 2.2KOhms and 220Ohms)