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What can be the problem with this circuit? Answered

I built this Opto Sensitive Dimmer's dimmer part first just one led the Orange is light. but can be the problem? I built this on a test board so sorry for the soldering.

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randofo

5 months ago

I assume it worked on a breadboard first?

I see some potentially bridged connections, lifted pads, and possible cold solder joints. It's hard to debug from this picture because there are honestly a lot of potential failure points. Not to mention, it might not even be the soldering at all. You could potentially have overheated one of the parts (it takes a lot of heat to lift a pad), or you could have shorted something if the soldering is incorrect.

Since these don't look like expensive components, I think it might be easier to start over (if possible), work very slowly, and try to keep the soldering very clean.

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rickharris

5 months ago

Your soldering leaves much to be desired. You need to check that you don't have any bridges across the tracks. Double, triple check your circuit is assembled correctly.