5second dark triggered timer

[baba101]

Here is Pmosfet timer with 5second on time , i am using A19 smd fet ..
FET timer is chosen to save battery on standby

but unable to make that Dark sensing trigger , i have to

1)keep cost low , no mcu
2)use common parts like bc547/5577

dark sensing trigger ,meaning it will make 5second timer on , when there is a shadow on LDr, ldr is getting light all the time otherwise

 

[CDRIVE]

Maybe I'm missing something. Where did you find (link) that circuit?

Chris

 

[Alec_t]

Is this a school/college task?

 

[CDRIVE]

Oooo, I used to catch those but I usually caught words and phrases.
Like:
We.
Not allowed to use IC's, MCU's, etc.
Needed this yesterday.
"I'm" or "we're" not permitted to use ......
Must provide circuit description including theory of operation.

Chris