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Electronic circuits and components * Course Index * Introduction * About the Author * About this Course * Feedback * Course Navigation * How to use this Course * TINA * Locktronics Fundamentals * Introduction: Fundamentals * Units and Multiples * Electricity * Electronic Principles * Electrical Circuits * Alternating Current * Assessment: Fundamentals Passive Components * Introduction: Passive Components * Resistors * Capacitors * Inductors * Transformers * Batteries, Fuses, Lamps and Switches * Assessment: Passive Components Semiconductors * Introduction: Semiconductors * Diodes * Transistors * Logic Gates * Assessment: Semiconductors Passive Circuits * Introduction: Passive Circuits * Series and Parallel Connections * Kirchoff's Laws * Potential and Current Dividers * Passive Time Variant Circuits * Assessment: Passive Circuits Active Circuits * Introduction: Active Circuits * Power Supply Circuits ## Half-wave rectifier ## Worksheet: Half-wave Rectifier ## Full-wave Rectifier ## Worksheet: Full-wave Rectifier ## Bridge Rectifier ## Worksheet: Bridge Rectifier ## Reservoir and Smoothing Circuit ## Worksheet: Reservoir and Smoothing Circuit ## Simple Power Supply ## Worksheet: Simple Power Supply * Operational Amplifier Circuits * Transistor Amplifier Circuits * 555 Timer Circuits * Assessment: Active Circuits Parts Gallery * Introduction: Parts Gallery * Passive Component Images * Semiconductor Images * Other Images * Quizzes |
(:Summary:Contains the 'action' links (like Browse, Edit, History, etc.), placed at the top of the page, see site page actions:) (:comment This page can be somewhat complex to figure out the first time you see it. Its contents are documented at PmWiki.SitePageActions if you need help. :) * Print (:comment (:if group Site,SiteAdmin,Cookbook,Profiles,PmWiki*:) (:comment delete if and ifend to enable backlinks:) * %item rel=nofollow class=backlinks accesskey='$[ak_backlinks]'% [[{*$Name}?action=search&q=link={*$FullName} | $[Backlinks] ]] (:ifend:) :) * Login Simple Power Supply<^< Worksheet: Reservoir and Smoothing Circuit | Course Index | Worksheet: Simple Power Supply >^>(:nl:)  The circuit diagram shows a complete power supply in which the mains is isolated by the double-pole single-throw (DPST) on/off switch, S1. T1 then acts as a step-down transformer (turns ratio 18.3:1) whilst D1-D4 form a full-wave bridge rectifier. C1 is the reservoir capacitor whilst R1 and C2 act jointly as a low-pass smoothing filter. Finally, Zener diode, D5, acts as a voltage regulator maintaining the output voltage at a reasonably constant 12V. In determining the component values for the circuit, it is important to note that the reservoir capacitor, C1, will charge to the secondary voltage of T1 less the forward voltage drops associated with two conducting diodes in the bridge configuration. In the arrangement shown, the voltage drop across C1 will thus be approximately (12 x 1.414V) - (2 x 0.65V) or about 15.7V (you should recall that the '12V' secondary voltage rating is quoted as an 'r.m.s. voltage' and this needs to be converted to a peak voltage by multiplying by 1.414). If the Zener diode is rated at 12V, the voltage drop across R1 will be approximately (15.7V - 12V) or 3.7V. Typical component values are; D1-D4 = 1N4001, D5 = 1N5349, R1 = 15Ω 2.5W, C1 = C2 = 2,200μF. (:nl:)(:table style="clear:both":)
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