A simple short-circuit protection circuit designed for 12V DC systems, integrating visual and audio indicators for fault detection.
The circuit utilizes a relay as the main switching element, activated by a push-button reset switch. A green "ON LED" indicates normal operation when current flows properly to the output, while a red "SHORT LED" and a buzzer alert the user in case of a short circuit.
The detection mechanism relies on voltage drop across a sensing resistor (1Ω–1.3Ω), which, when excessive, triggers the short circuit path to disable the output and activate the alarm.
This protection system is ideal for low-power DC electronics, safeguarding connected devices from damage due to unintended shorts.
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