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PostPosted: 03.12.2007 18:10 
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Junior Modder
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Joined: 02.12.2007 23:24
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hi.

I need help with the circuit color fade. I want to put an opto coupler with a thyristor and does not work for me, not the prenden LEDs, I connect LEDs in series. It is possible to use an optocoupler with thyristor and connect LEDs in series?

the opto coupler I am use is PC817 and the thyristor is BT169D


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PostPosted: 03.12.2007 19:27 
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Are you trying to light up some 110/230 volt light bulbs?

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PostPosted: 03.12.2007 21:40 
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Junior Modder
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Eh I made a PCB apart where these soldiers 5 LEDs in series with a resistance of 120 ohm. Four rows are equal, in total there are 20 LEDs, operating at 12VDC. I want to know if it is possible to connect these leds to an opto coupler which is connected to the circuit led fade


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PostPosted: 03.12.2007 22:21 
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If you control the optocoupler directly from the output of the chip and not via the transistor, it might work. It is not nearly the same thing to drive a led inside the optocoupler and to hope it to behave the same way as a transistor would but you could get some fading out from it.

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PostPosted: 04.12.2007 00:26 
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Junior Modder
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I did the test that told me, it connects directly to opto coupler and if it works, but the color fade is very little, hardly note the fading.

So you see you have a better idea, my opinion would replace opto coupler for a better, but not to us another component that can replace opto coupler with the thyristor and work with 12VDC.


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PostPosted: 04.12.2007 16:18 
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I've always thought thyristors as on/off components. If they offer a control curve similar to transistors sure, go ahead and use it. There are also transistors available for higher voltage. And then there are fets... For example BUZ11 that I've used in couple of my PWM-led fading projects.

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PostPosted: 04.12.2007 19:05 
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Junior Modder
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Another idea best friend, in order not to complicate my adding more components, it would be better to do the whole circuit work with 12VDC, which are the components that have to change for the whole circuit operates at 12VDC?


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