Rectifier/filter circuit

Chapter 5.6 Rectifier/filter circuit

Lessons In Electric Circuits Volume VI – Experiments Book
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Summary of Contents

Lessons In Electric Circuits Volume VI – Experiments Book

  • 5.6. RECTIFIER/FILTER CIRCUIT2215.6Rectifier/filter circuitPARTS AND MATERIALS• Low-voltage AC power supply• Bridge rectifier pack (Radio Shack catalog # 276-1185 or equivalent)• Electrolytic capacitor, 1000 µF, at least 25 WVDC (Radio Shack catalog # 272-1047 orequivalent)• Four ”banana” jack style binding posts, or other terminal hardware, for connection topotentiometer circuit (Radio Shack catalog # 274-662 or equivalent)• Metal box• 12-volt light bulb, 25 watt• Lamp socketA bridge rectifier ”pack” is highly recommended over constructing a bridge rectifier circuitfrom individual diodes, because such ”packs” are made to bolt onto a metal heat sink. A metalbox is recommended over a plastic box for its ability to function as a heat sink for the rectifier.A larger capacitor value is fine to use in this experiment, so long as its working voltage ishigh enough. To be safe, choose a capacitor with a working voltage rating at least twice theRMS AC voltage output of the low-voltage AC power supply.High-wattage 12-volt lamps may be purchased from recreational vehicle (RV) and boatingsupply stores. Common sizes are 25 watt and 50 watt. This lamp will be used as a ”heavy” loadfor the power supply.CROSS-REFERENCESLessons In Electric Circuits, Volume 2, chapter 8: ”Filters”LEARNING OBJECTIVES• Capacitive filter function in an AC/DC power supply• Importance of heat sinks for power semiconductorsSCHEMATIC DIAGRAMACRectifier-+inDCout