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.

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.

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.

All OK!

All OK!

All OK!

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 ?

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 ?

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 ?