Solar Warning Light

Thread Starter

Hira26

Joined Apr 6, 2018
5
Hello, Im having my project regarding the 5 LED Solar Warning Light which is from Future Kit. I tried to connect them with 4.5V from battery supply but it is not working. As picture shown below, is there any short circuit or wrong connection? Im beginner and new to this. Hehe hopefully someone willing to help me work it ☺

MOD: Rotated your upside down images.

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ericgibbs

Joined Jan 29, 2010
21,413
hi Hira,
The circuit value of R15 [10k] resistor is much to big, the actual value in the board looks like a 100R.???
Is the right side of the 100R in the correct board hole, it looks as though its not making contact with the Red LED links.

I would suggest you start testing the circuit by connecting the 100R directly to the 4.5V rail [not the transistor] , they should light.
If they light OK, put the 100R back into the TR8 Collector, then short TR7 Collector to 0V, the LED's should light.
Let us know how that initial test goes.

BTW: Unless the forward voltage drop of the 5 LED's are not matched [ the same] it is not good practice to parallel LED's
E
 
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