A 12v relay is connected across the 12v supply. When the output is shorted, the 12v falls to 0v and the relay drops-out. The contacts open the 12v is reapplied to the relay and it will "chatter" if the short is not removed.
This circuit will simply not work and the relay will simply become a "Buzzer."
In the following circuit, the transistor will only turn on if the output voltage is above 0.6v.
This circuit will simply not work and the relay will simply become a "Buzzer."
In the following circuit, the transistor will only turn on if the output voltage is above 0.6v.
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