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About Ivanlee

  • Birthday July 13

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    Perth, Australia
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  1. Thank you for helping 🙂 I have a bunch of 1k, 1/4W resistors, so 10 of those will work fine. I guess that 6mA at 60V is only 360mW, which might be a bit high. I could always use a lot more resistors and experiment by reducing it until I get to a suitable brightness.
  2. Good day, all 🙂 Recently, I have a system running at 62V max, 54V nominal based on voltage divider rule formula. I wanted to have a little alert LED, so I was thinking about using 10, 1kohm resistors, and adding the LED bewteen the 9th and 10th (or 1st and 2nd, if it matters), to get at most 6V and just a few mA. Is a better/easier way? Is this a really crappy way? Or is this a perfectly fine way? 😶 Voltage Divider Basic and Rule.pdf
  3. Hi, all I'm using a PCA9685 with a pinout board like Adafruit's. I'm trying to run a bunch of LEDs at 20 mA, and the chip is supposed to be able to source 10 mA and sink 25 mA. I understand that to have it Source, you connect the LED between the PWM and GND pins and to Sink you connect it between V+ and PWM. I've tried both ways and using a multimeter and a red LED I get 12.5 mA. Why is it not 25 in Sink? Also, why do I get 12.5 on Source mode as well? Is there anyone have ideas of it? if possible a simple explanation would be nice. Many thanks.☺️
  4. In electronics, a non-inverting amplifier is an op-amp circuit configuration which produces an amplified output signal. Its output signal is in-phase with the input signal applied. And non-inverting amplifier always behave like a voltage follower circuit. There is less info anout non-inverting amplifiers and inverting amplifiers when searching the internet, so I hope to get more info about them from different aspects. Many thanks Non-Inverting Amplifier and Inverting Amplifier.docx
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