Comments on: Infrared alarm barrier

By: kluzze

kluzze — Mon, 30 Nov 2009 10:54:49 +0000

I am building these circuits but the Infrared Light Barrier Receiver isn’t working as is shoudt be.Can i have a reponse if anyone now wy it doesn’t work.
Or has anyone a reponse wat to do.

Thank you

By: Andromeda

Andromeda — Sat, 10 Oct 2009 12:36:42 +0000

Hi,

Do you know what is the maximun distance between the transmitter and the receiver?

Thank you

By: Ericyeoh

Ericyeoh — Mon, 17 Aug 2009 13:37:14 +0000

Hi, can i know why the IC1 is produce 300hz?
f =1.4/[(R1 + 2R2) × C1]
from the formula
substitude the value
R1= 4.7k
R2=100k
C1=10n
Frequency should be 683.92hz

By: Ericyeoh

Ericyeoh — Mon, 17 Aug 2009 13:35:28 +0000

Hi, can i know why the IC1 is produce 300hz?
f =1.4/[(R1 + 2R2) × C1]
from the formula
substitude the value
R1= 4.k
R2=100k
C1=10n

Frequency should be 345.9hz