1. Prepared by: Partha Kumar Das Lecturer, Dept. of ME, BUET
ME 362 Instrumentation and Measurement Sessional
5 Volt Power Supply
Prepared by:
Partha Kumar Das Lecturer, Dept. of ME, BUET
Courtesy: Dr. A. K. M. Monjur Morshed
Assistant Professor, Dept. of ME, BUET

2. 5 V Power Supply 1. Step Down Transformer
Basic Components:
Step down transformer
Voltage regulator
Capacitors
Diodes
1. Step Down Transformer
Non-tapped Transformer
Center-tapped Transformer

3. 1. Step Down Transformer

4. 2. LM 7805
IC 7805 is a 5V Voltage Regulator that restricts the voltage output to 5V from an input of 7.5 to 35 V DC.
7805 IC Rating :
Input voltage range = 7V- 35V
Current rating Ic = 1A
Output voltage range VMax=5.2V ,VMin=4.8V
If the voltage is near to 7.5V then it does not produce any heat and hence no need for heatsink.
If the voltage input is more, then excess electricity should be liberated using as heat from heat sink.

5. LM 7805

6. 3. Capacitors
Generally three types: 1. Non-polar Capacitor 2. Polar/ Electrolytic Capacitor
3. Variable Capacitor

7. Diodes (1N4007)

8. 5 V Regulator Circuit

9. 5 V Regulator Circuit

10. Class Performance 1

11. Class Performance 2 & 3