How to use the 555 timer to delay an incoming signal for a specific amount of time?

[hadef]

how could i use the 555 timer to delay the coming signal for specific amoint of time

i mean i need a circuit that will alarm 2 minutes after the darkness is detected

 

[IanP]

Re: timer 555

Connect one 555 as 2-minute delay timer and another 555 as the alarm timer ..
The first timer is triggered by a photo-resistor (dark detector), the second timer is trigged by the first timer (alarm timer) ..
Examples of both circuits can be copied from:
**broken link removed**

Regards,
IanP

 

[ziyas]

Re: timer 555

it could help you :

 

[farshid.azhir]

Re: timer 555

u need a monostable circuit so 555 timer is nice select for this
this circuit is adjustable 0sec to 8minute

 

[vicky]

Re: timer 555

for this you have to connect it with the ldr tha a delay circuit and then a 555 timer it will gives you more accurate idea how the circuit hsould work

 

[electronics_kumar]

Re: timer 555

how could i use the 555 timer to delay the coming signal for specific amoint of time

i mean i need a circuit that will alarm 2 minutes after the darkness is detected

Convert 555 into monostable multivibrator..that will act as a delay circuit