Category Archives: Power Supply

Supply Voltage Monitor with 555 IC

Posted on August 25, 2011 by Rend

This is a supply voltage monitor circuit, an indicator to show if the power supply is in good condition. Designed using the IC 555 timer, this circuit will flash the LED1 when the supply voltage surpass preset level.  With flashing … Continue reading →

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Extending Battery Life with Switching Regulator

Posted on May 4, 2011 by Rend

A normal 9V battery would be considered as dead battery when the voltage falls below 7 Volts. With this switching regulator, a  lifetime of a 9V battery will be extended by boosting the voltage if the battery voltage falls under … Continue reading →

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Remote On-Off Switch through Small Transformer

Posted on May 1, 2011 by Rend

This is a remote on-off switch circuit. With this circuit, we can take the benefit of using small switch to control larger AC current from high power devices. Safer operation is the other benefit, since this circuit is control the … Continue reading →

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