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4.67 out of 5
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  • 21/12/2023

    Small module for alarming when there's no 220 V mains. It works with 3 V and there's a switch to stop it if it takes too long to restore power. You will need the schema in this page to identify component values.

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  • 29/02/2024

    All OK!

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  • 19/11/2023

    I received the product in good state. Nevertheless, there is a problem with the optocoupler when assembling the product: on the diagram the device has a little notch to insert it in the correct position, but the optocoupler that I received has no such notch. How can I find the correct sense ?

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