Marco81K
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LED Music Spectrum Clock DIY Kit 512pcs LED SMD Welding Kit Electronic DIY Level Display Light Kit
US$15.99 US$22.99

Q: Hello, I have just finished all welding for the spectrum analyzer. All LED's in upper right side of the display will not light up. Can you tell me what to look for and how to diagnose this problem. Thank you.

Asked by azadikian on 2021-10-02 21:20:29

Marco81K Check every pin on the integrated circuits, had that problem too. Looking at the schematic and measuring it with a meter helps.

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5Pcs 3.3V RC522 Chip IC Card Induction Module RFID Reader 13.56MHz 10Mbit/s Geekcreit for Arduino - products that work with official Arduino boards
US$10.99 US$23.99

Q: Hello. Do you know firmware version of this product ?

Asked by JL C on 2018-07-01 09:10:46

Marco81K Request by Arduino library says 0x12, so no original chip. Working, but not so reliable like the original.

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5V Electric Magnetic Active Buzzer Continuous Beep Continuously
US$2.99 US$3.49

Q: Why do they require washing? What is it they are covered in that makes this such a necessity please? Do we need to wear gloves to handle them?

Asked by BG181554142 on 2020-04-15 01:16:05

Marco81K I think it's meant to be removed after soldering and cleaning the whole PCB

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