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About Ivanlee

  • Birthday July 13

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    Perth, Australia
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    Traveling, movies, eating and so on

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Ivanlee's Achievements

  1. Hi, all I have built new crossovers for my Thiels using mostly Clarity CSA caps. On the coax board, the two feeds and subfeed are bypassed with Multicap RTX (~1%). I am super happy with the SQ improvement. Well-recorded music sounds fantastic, just sublime. Really hard to fault, especially at this price point. Excellent transients with resolution and transparency for days; adding the RTX added a bit to the transients and resolution. But poorly recorded music is now more evident than ever and can sound relatively "cool", even thin, most notably on vocals. I’m wondering if a double bypass or different bypass cap might add a bit more flesh or hint of warmth. The Jupiter copper foil at 0.01 uF caught my interest but I’ve read reports that this small of capacitance can be inaudible, as well as reports that it can make a big difference (eg, humblehomemadehifi review of Dueland bypass). Questions: a) do you think a different bypass or double bypass would result in the sound I seek? b) if yes, more likely to get a good result with Jupiter double bypass at 0.01 uF or, say, Audyn True Copper Max at ~1%. Is there anyone have ideas of it? Many thanks.
  2. 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.
  3. 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
  4. 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.☺️
  5. 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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