Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I am building a door entry system operated by a push button to alert the door keeper by a set of two colour LED's the door magnet will be released through a radio fob. how ever I need a gizmo that will keep the LED from the bell push lit as follows;-
System powers up through a key switch when...
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