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12V – 5A Regulated Power Supply

Circuit Analysis This circuit is a 12V, 5A regulated power supply, based on the 7812 voltage regulator and BD434/436/438 transistors to increase the available output current. Let’s analyze how it works: Rectification and Filtering The transformer...

Invisible Theft Alarm System

The invisible theft alarm system consists of a phototransistor and an infrared LED. When the infrared beam is unobstructed, the alarm remains silent. However, if the infrared beam is interrupted, the alarm is triggered, emitting a sound. The system...
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