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Yeah, I think if he wants an alarm for each power supply, then simply use an inverter for each supply so when either one goes low, one of the alarm will trip off. But if both power supply will be down, both alarms will sound.
Re: convert 0.12 vac to dc
Hello madhusuthana,
What DC voltage do you actually need? That information would be vital for the design of this circuit. :-)
Hello,
Yes, you are right, the voltage across the terminals of a power supply is higher that the voltage at the end of the transmission line because of the power loss of the copper wire. In DC systems, the power loss in long TL is very large because of the copper loss/heat loss or the I2R loss...
As the name implies, the DC-DC converter "converts" a DC signal to a different DC level(Higher/Lower). In AC, stepping up/down voltage is easy using a transformer. In DC, it's a bit more complex because you can't use transformers anymore. The stepping up/down in DC is done using the following...
Hello Strape,
I think this simple circuit will do the trick. Simulated it using Multisim and seemed to work fine. Just change the LED to a buzzer of your need. Hope this helps. :-)
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