Can pc817 be used for triac(BT136) switch

Thread Starter

idrbur

Joined Jan 11, 2018
43
I've been trying to build few AC switches and tried using pc817s and they worked perfectly when i built a single switch with it but as soon as i attach another switch both switches turn on at the same time. I'm using an isolated supply for pc817 and few diodes to stop any reverse current in pc817.
Can anyone tell what have been doing wrong or any alternate method to use pc817 with triac(BT136).
Thanks.
 

Ian0

Joined Aug 7, 2020
5,494
A circuit diagram would help.
You can switch a triac with a PC817 if you have a separate supply of about 5V referenced to the same voltage as MT1 on the triac.
 

Ian0

Joined Aug 7, 2020
5,494
What is the device labelled + and - ?
Identify the terminals on the opto and the triac, and we might get somewhere.
 

Thread Starter

idrbur

Joined Jan 11, 2018
43
That "device" is a battery. 5v
The dot on pc817 is anode.
You can find the pin diagram anywhere.
BT136 Terminal connected to PC817 is GATE next to it is T1 and other is T2
 

Thread Starter

idrbur

Joined Jan 11, 2018
43
That "device" is a battery. 5v
The dot on pc817 is anode.
You can find the pin diagram anywhere.
BT136 Terminal connected to PC817 is GATE next to it is T1 and other is T2
Correction terminat next to gate is T2 and 3rd one id T1
 
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