[SOLVED] alarm controlled by light

Status
Not open for further replies.
A

afifar

Newbie level 5
Joined
Dec 7, 2012
Messages
8
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Visit site
Activity points
1,327
i have a task like following circuit

but i dont understand how to connect the optocoupler. can anybody show me the way ?
and what's the function of the switch and SCR ?
 

Attachments

  • Untitled.jpg
    120.5 KB · Views: 114

You have to pass current through the LED side of the opto-coupler for it to work. When it conducts, the first transistor turns off, this turns the second transistor on and fires the SCR to make the light turn on. SCRs stay conducting until the current through them is removed so once triggered the light will stay on. The switch shorts the SCR out so no current flows through it and it stops conducting. As long as the current through the opto-coupler LED has been removed so it doesn't immediately re-trigger, the switch will make the light turn off.

Brian.
 
Reactions: afifar

    A

    afifar

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…