I'm trying to design a LED circuit where a LED beings to flash after the light is turned off.
For the light detection part, I followed the design of the following ciruit, without any problems. Light-sensitive Alarm Project
Afterward, in order to make the LED flash, I used a simple astable 555 circuit, as follows: **broken link removed**
Both the circuits work without problem by itself. However, it fails to work when I join the 3rd leg of the 1st IC (the Light dependent circuit) as the input voltage of the 2nd circuit.
How am I suppose to connect the two ICs in order to make the circuit work?
Thanks a lot!
For the light detection part, I followed the design of the following ciruit, without any problems. Light-sensitive Alarm Project
Afterward, in order to make the LED flash, I used a simple astable 555 circuit, as follows: **broken link removed**
Both the circuits work without problem by itself. However, it fails to work when I join the 3rd leg of the 1st IC (the Light dependent circuit) as the input voltage of the 2nd circuit.
How am I suppose to connect the two ICs in order to make the circuit work?
Thanks a lot!