electronic components1 power supply - stage 1 n mains voltage has to be reduced 1 - transformation +...
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![Page 1: Electronic Components1 Power Supply - Stage 1 n Mains voltage has to be reduced 1 - Transformation + - + - 120 V AC 30 V AC 4:1](https://reader035.vdocuments.net/reader035/viewer/2022062511/551acb605503466b6a8b51ce/html5/thumbnails/1.jpg)
Electronic Components 1
Power Supply - Stage 1 Mains voltage has to be reduced
1 - Transformation
+
-
+
-
120 VAC
30 VAC
4:1
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Electronic Components 2
Power Supply - Stage 2 Alternating voltage has to be converted to DC
2 - Rectification
Half wave rectification
Load
30 VAC
9.6 VDC
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Electronic Components 3
Power Supply - Stage 2 Alternating voltage has to be converted to DC
2 - Rectification
Half wave rectification
Load
-9.6 VDC
30 VAC
![Page 4: Electronic Components1 Power Supply - Stage 1 n Mains voltage has to be reduced 1 - Transformation + - + - 120 V AC 30 V AC 4:1](https://reader035.vdocuments.net/reader035/viewer/2022062511/551acb605503466b6a8b51ce/html5/thumbnails/4.jpg)
Electronic Components 4
Power Supply - Stage 2 Alternating voltage has to be converted to DC
2 - Rectification
Full wave rectification
RL
30 VAC
19.1 VDC
![Page 5: Electronic Components1 Power Supply - Stage 1 n Mains voltage has to be reduced 1 - Transformation + - + - 120 V AC 30 V AC 4:1](https://reader035.vdocuments.net/reader035/viewer/2022062511/551acb605503466b6a8b51ce/html5/thumbnails/5.jpg)
Electronic Components 5
Power Supply - Stage 3 Fluctuating voltage has to be smoothed
3 - Filtered
RL
RL = 5.1 k
C = 33 F
Vout = 40VDC with 1V ripple
![Page 6: Electronic Components1 Power Supply - Stage 1 n Mains voltage has to be reduced 1 - Transformation + - + - 120 V AC 30 V AC 4:1](https://reader035.vdocuments.net/reader035/viewer/2022062511/551acb605503466b6a8b51ce/html5/thumbnails/6.jpg)
Electronic Components 6
Power Supply - Stage 3 (Filtering)
RLRS
When first turned on capacitor acts as a short. The surge current can damage
diodes. This can be reduced by adding a surge resistor.
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Electronic Components 7
Power Supply - Stage 3 (Filtering)
RL
A more effective (although more costly) way is to use an inductor to oppose the changes in current. The capacitors in the LC filter oppose
changes in voltage.
![Page 8: Electronic Components1 Power Supply - Stage 1 n Mains voltage has to be reduced 1 - Transformation + - + - 120 V AC 30 V AC 4:1](https://reader035.vdocuments.net/reader035/viewer/2022062511/551acb605503466b6a8b51ce/html5/thumbnails/8.jpg)
Electronic Components 8
Power Supply - Stage 4 Voltage has to be smoothed further
4 - Regulation
Zener diode gives constant base voltage. Thus base current is constant and so will be the collector and emitter currents.
RL
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Electronic Components 9
Graymark 808 Power Supply
Power supply was built from a kit.
Has two 0 - 15V and one 5V
Also has three protoboards
Ideal for doing analogue and digital lab projects
![Page 10: Electronic Components1 Power Supply - Stage 1 n Mains voltage has to be reduced 1 - Transformation + - + - 120 V AC 30 V AC 4:1](https://reader035.vdocuments.net/reader035/viewer/2022062511/551acb605503466b6a8b51ce/html5/thumbnails/10.jpg)
Electronic Components 10
Graymark Power Supply
Bottom plate shows transformer and circuit board
Circuit Board
Bottom plate
Transformer
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Electronic Components 11
Graymark Power Supply
Circuit board
Rectifier diodes
IC regulator
Filter capacitor