Basics: Introduction to Zener Diodes | Evil Mad Scientist Laboratories
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ac - Use of different diodes in a bridge rectifier - Electrical Engineering Stack Exchange
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identification - Help identifying a component in glass housing (looking like a resistor) and markings "PH 41 48" - Electrical Engineering Stack Exchange
1N747 Zener Diode Pinout, Datasheet, Features and Example Circuits
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Glass Diode identification
Antique Radio Forums • View topic - identify glass diodes?