A friend of me wants 10 second delay timer circuit at can turn ON Fan 12V at use in an automobile. By fix the period of time about 10 second. He sets conditions that must use electronic part economize and seek easy with. I then choose transistors and relay be control electric fan equipment follow the circuit in a picture. The value delays can fix with R1 and C1 which there is a formula calculates 0.5 x R1 x C1 . When press S1 wait for about 10 second relay then work turn on give the electric fan works. The detail is other see in the circuit.
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