Power Outage Sensor

Power Outage Sensor

“Track the 230 VAC power line with your favorite HW using a small, efficient, and inexpensive circuit. Story In my wireless doorbell tutorial I gave the advice about how to get a digital signal from a 12 Vac source so …

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Make a Relay Modul With Optocoupler

Make a Relay Modul With Optocoupler

“Introductions : Relays are mechanical switches ,compare to semi-conductor there switching time are very slow , but it switch in relatively high voltage,One example use of relays are in the Car or bike as electric ignition they increase relatively low current …

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