Engineering: timer with transistors, resistors and capacitors

This project received 24 bids from talented freelancers with an average bid price of $38 USD.

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Project Description


I would need the schematics and the list of components to reproduce a timer (see attached document).

I do NOT need a prototype but just the schematics.

This has to be done with only transistors, resistors and capacitors. No timer NE555 or equivalent components.

The reason is: I need the cheapest timer possible


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