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5second dark triggered timer

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
 

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CDRIVE

Hauling 10' pipe on a Trek Shift3
Maybe I'm missing something. Where did you find (link) that circuit?

Chris
 

CDRIVE

Hauling 10' pipe on a Trek Shift3
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
 
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