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Ivanlee

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About Ivanlee

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  • Birthday July 13

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    Perth, Australia
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    Traveling, movies, eating and so on
  1. 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.☺️
  2. 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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