1. Dual Power Supply Design Industrial Attachment Training-2017
Presented By:
Engr. Shah Mim Obydulla
B.Sc in EEE (DUET)
Director of
Rainbow Automation
Rainbow
Automation
Industrial Attachment Training-2017

2. Industrial Attachment Training-2017
Circuit Diagram
I/P
220V AC
O/P
12V*2 , 3000mA
Bridge Rectifier
Pulse sating dc
ac + dc
Pure dc
IC1 1 3
7812
+12V + _ 2 C1
1000uf
50V
Pulse sating dc
ac + dc 0V
Transformer + _ C2
1000uf
50V
IC2
7912 2 1 3
-12V
Pure dc
Fig: Circuit Diagram Of Dual Power Supply
Rainbow
Automation
Industrial Attachment Training-2017

3. Industrial Attachment Training-2017
I/P
220V AC
O/P
12V*2 , 3000mA
Bridge Rectifier
IC1 1 3
7812
+12V + 2 C1
1000uf
50V _ 0V + C2 _
1000uf
50V 1
Transformer 2 3
7912
-12V
IC2
Necessary Equipment
Transformer (12V x2 ,3000mA) pcs
Soldering Stand pcs
Diode (IN4007) pcs
Soldering Lead (as per requirement)
Capacitor (1000µF/50V) pcs
Soldering Rosin (as per requirement)
Regulator (IC 7812 & 7912) pcs
Safety Goggle pcs
DC Load (Fan-12V) pcs
Connecting Wire (as per requirement)
Multimeter pcs
Wire Stripper (as per requirement)
Soldering Iron pcs
Masking Tape (as per requirement)
Rainbow
Automation
Industrial Attachment Training-2017

4. Industrial Attachment Training-2016
Transformer
A.C Input 220V
A.C O/P 12V
A.C Input 220V 0V
A.C O/P 12V
A.C Output
Fig: Transformer
Fig: Transformer Symbol
Rainbow
Automation
Industrial Attachment Training-2016

5. Anode Cathode Diode Industrial Attachment Training-2017 Fig: Diode
Fig: Diode Symbol
Rainbow
Automation
Industrial Attachment Training-2017

6. Industrial Attachment Training-2017
Bride Rectifier
1st Step
2nd Step
3rd Step
Fig: Bridge Rectifier Making Process
Rainbow
Automation
Industrial Attachment Training-2017

7. - - Capacitor + + Industrial Attachment Training-2017
Fig: Capacitor
Fig: Capacitor Symbol
Rainbow
Automation
Industrial Attachment Training-2017

8. Voltage Regulator IC 780XX1 2 3
Input
GND
Output
Fig: Voltage Regulator IC 7812
Fig: Voltage Regulator IC Chart
Rainbow
Automation
Industrial Attachment Training-2017

9. Voltage Regulator IC 79XX
L7912 CV 1 2 3
GND
INPUT
OUTPUT
Fig: Voltage Regulator IC
Fig: Voltage Regulator IC Symbol
Rainbow
Automation
Industrial Attachment Training-2017

10. Industrial Attachment Training-2017
DC Load
Fig: Cooling Fan & Lamp e.t.c
Rainbow
Automation
Industrial Attachment Training-2017

11. Industrial Attachment Training-2017
Wiring Diagram
Input AC
220 V
L7912 CV
Fig: Wiring Diagram of Dual Power Supply
Rainbow
Automation
Industrial Attachment Training-2017

12. Industrial Attachment Training-2017
Rainbow
Automation
Industrial Attachment Training-2017