KerimF
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Sir, since pin 4 will be high for 5s when BP1 is press, can i directly connect it to the NPN transistor instead of connected to PNP through U4.When BP1 is pressed, pin 6 becomes low and the output pin 4 (and pin 12) will be high
I noticed you wrote R5 (24mA, 3.3 V). But 0.18 * 24 = 4.32 V
Also you wrote R4 (9.5 mA). But 39 * 9.5 = 370.5 V
is it neccessary to put the diode??. I try put the diode parallel to it with the anode(no strip) facing toward pin 4 . When I press the switch the LED will blink. in oposite direction, the result is same as not puting the diode(2)You may need adding a small diode in parallel with R3 (330K) to dischage rather quicky C1 (22uF) when pin 4 returns to low after the 5 sec.
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