triac triggering circuit
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triac triggering circuit

 
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cj_electro285



Joined: 17 Oct 2006
Posts: 2
Location: Philippines
Posted: Tue Oct 17, 2006 11:24 pm    Post subject: triac triggering circuit Reply with quote
Hello. I'm Carl John Q. Balgos. I'm having trouble with my triggering circuit using opto isolator to trigger triac. i've used an LDR and Led covered in a dark tube as an opto isolator. but the problem is that the triac will always activate even if the opto i used is not activated. whats wrong with the circuit? is LDR not applicable for AC signals?


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neon



Joined: 25 Feb 2006
Posts: 590
Posted: Mon Oct 23, 2006 3:27 pm    Post subject: Reply with quote
Ano ang sabimo no i am not flip just know a few words.a triac will conduct if it exceed the anode to cathode voltage make sure that is not happening . short the gate and verify that first and you did not supply a schetch so i cannot tell you more.
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cj_electro285



Joined: 17 Oct 2006
Posts: 2
Location: Philippines
Posted: Tue Oct 24, 2006 4:51 am    Post subject: triac Reply with quote
Hello neon, ano ba ang natapos mo! what are you sayi'n! FYI triac has no cathode. what's up with your brain! Laughing


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neon



Joined: 25 Feb 2006
Posts: 590
Posted: Wed Oct 25, 2006 10:05 am    Post subject: Reply with quote
TRIACS SCRS conducts if you exceed the anode to cathode voltage no matter where the gate is sitting at. and without a proper schematics my brain cannot determine what the hell you are doing wrong.
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