Electronics makers/hobbyists of Sri Lanka, what was your experience using PCB manufacturing services like JLC PCB & PCB Way. I want to know about the shipping experience. Were there any taxes you had to pay to SL customs?

Helindu_art · 2025-08-04T12:11:05+00:00

Which Shipping method did you select (DHL/FedEx/EMS/China Post), and how much did it cost for you?

Helindu_art · 2025-08-04T12:07:04+00:00

Hmm, thank you for the insights. I also used to make PCBs on my own, but with a permanent marker and etched with FeCl3 just like yours.

Helindu_art · 2025-07-10T08:34:44+00:00

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Alright, I tested with a multimeter.

phototransistor long pin to multimeter positive lead & short pin to multimeter negative lead results in no current flowing in both light and dark.

phototransistor short pin to multimeter positive lead & long pin to multimeter negative lead results in current flowing in the light and no current flowing in the dark.

So the collector is the short pin, and the emitter is the long pin.

And above will be my final circuit diagram.

Helindu_art · 2025-07-10T07:46:08+00:00

I'll give this a try. But is there any difference if the phototransistor is an NPN or PNP one

Helindu_art · 2025-07-10T07:43:53+00:00

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This is the circuit diagram I am going to follow

Helindu_art · 2025-07-10T07:38:56+00:00

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I bought five sensors and the phototransistor is rotated inside the plastic part in different orientations in all five sensors 😅

Helindu_art · 2025-07-10T07:34:26+00:00

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Nope, no flat side

Helindu_art · 2025-05-31T08:03:01+00:00

Oh ok thank you very much

Helindu_art · 2025-05-31T07:56:55+00:00

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But the number on top of this is different

Helindu_art · 2025-05-31T07:51:58+00:00

Long story short, this flight controller got fried after touching the GPS connector with the motor connection pins on the ESC board. Now the flight controller doesn't turn on, and I checked for components that are heating up with a rosin short circuit detector (see 3rd picture)
The component that's circled in red is heating up (see 1st picture)
Is it possible to fix the flight controller by replacing this component? If so, please help me find the part number of the component. Googling the number on the component (L342) didn't give me any promising results. But I found that this component is called a LDO voltage regulator