# Electronics help! recitifier with a zener diode

Tags: electronics, rectifier, transformer, zener
 P: 23 1. The problem statement, all variables and given/known data Design a rectifier with a zener diode that satisfies the following: Primary voltage = 120V @ 60Hz VDC = 12V IR2 = 100 mA (R2 being the load) Vr(R2) <= .3V 2. Relevant equations C=IDC/(2fVr) IDC=IR3 + IR1 3. The attempt at a solution I tried calculating the capacitor, but how am I supposed to get IDC if I dont have any other current? Attached Thumbnails
 Sci Advisor P: 1,724 Remember that a reversed Zener diode clamps the voltage, but must be above the zener current ($i_{zk}$) in order to do so: http://www.electronics-tutorials.ws/diode/diode_7.html

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