lab #2 – power supply. © bob york back to toc 2 © bob york back to toc 3 linear power supply
TRANSCRIPT
Lab #2 – Power Supply
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Linear Power Supply
LoadRegulatorFilterRectifierTrans-formerTo AC line
Vmsint
Vout
Vout
Iout
+
-
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Rectifier/Regulator Circuits
+C RVout
Iout
+
-
Transformer Bridge Rectifier
+C RVout
Iout
+
-
Transformer Bridge Rectifier
ActiveRegulator
+C
Vpos+
Center-TappedTransformer
BridgeRectifier Positive
Regulator
CVneg
NegativeRegulator
Common
Vout RUnregulated DC
Voltage-controlled resistor Iout
Vref
VpV
T
Time
Voltage
Charging Discharging
T/2
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Power Transformer Assembly
In-line fuse holder
AC Power cord
Transformer
PrimarySecondary
Power switch
Earth ground 9 VAC
120 VAC
240 VAC
Blue
RedBlack
Black
Yellow
Yellow
9 VAC
Jameco105532
120 VAC
9 VAC
Blue
9 VAC
Black
Black Blue
Blue w/Stripe
StancorP-8691
18VCT @ 1AOn/Off
Fuse
AC power
Earth ground
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Full Schematic
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PC Board
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Separate individual pins for test points
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Rectifier Plus Capacitors
Cathode
18VCT @ 1AOn/Off
Fuse
AC power
Earth ground
GND
C1RL
0.1Ω
C3
+Rect
-Rect
Rs
Vout
Long-lead is “positive”
“-” sign on package indicates “negative” lead
Value and voltage rating printed on package
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LM317 Regulator
“Wiper”
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Scope Grid