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Which relay is required for this time switch?

A lot of relays have "Form C" contacts, meaning there is a common pin that switches back and forth between the normally open (NO) and normally closed (NC) contacts. There can also be ...
kolyur's user avatar
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Which relay is required for this time switch?

The schematic specifies that the relay contacts should be normally closed (NC), which is not something you will find easily in a 4-pin design. The reason is that 4-pin relays use two pins for the coil,...
Simon Fitch's user avatar
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How to use C005 timer chip?

You need to have TRIGGER at 0V to have it start when power is applied. I think this will work, but no guarantees. It should re-trigger on release of SW1 (after press). simulate this circuit – ...
Spehro 'speff' Pefhany's user avatar

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