and/or logic gate + flip/flop question

[Skidood]

Hi again

I want to build this circuit but in the Excel simulation provided, it appears to me that the AND gate and the OR gate are mistakenly swapped in the circuit. Can anyone confirm?
You need to have Excel installed to run the simulation.
http://www.engineers-excel.com/Apps/Alarm/Description.htm

Thanks so much!

 

[Old Steve]

I ran the simulation and it works as described. Surprisingly, pressing 'Clear Alarm' doesn't turn off the visual alarm unless 'Acknowledge' is also pressed, but that's how it's supposed to work according to the description. ('Clear Alarm' only stops the audio alarm and not the visual one.)

Edit: Actually, it's not that surprising - I just finished a PIR-based wireless alarm system, and used a latched flashing red/blue LED after the audible alarm had shut off to indicate that an alarm condition had occurred in the past, with a 'Reset' button to shut off the LED.

Exactly what problem are you having? (Which & and OR do you think are reversed?)

 

[Skidood]

Thanks mate...about an hour ago, I was playing with it again and realized its OK.

 

[Old Steve]

No worries. It's operation is a bit confusing at first.