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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 think D3 is backwards in your schematic. I believe C1, R3 and Q2 provide a trigger pulse to the 555, D3 if turned around would quickly discharge C1 when SW1 is closed.
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