Damping of EMI Filter

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  • abajor
    Old KSC Digmoda DDC552 Bang and Olufson ICE amp My mission to repair.
    by abajor
    I'm about to take a journey into repairing this 3 Channel ICE amp. It's got a bunch of fun components I am not familiar with like Direct Stream Digital chips. It also has some onboard Digital Signal Processor which I haven't identified yet.

    I am not familiar with ICE amp circuits other than they are a type of PWM amplifier so I'm assuming they require a ton of high frequency filtering on the output. I'm also assuming that the output of the DSD chips probably directly feed the ICE amp signal since DSD is also essentially PWM or creating an averaged AC signal using high frequency ~2MHz...
    05-23-2024, 11:44 PM
  • cheese007
    Input Filter Filling: How to Choose Components?
    by cheese007
    Recently acquired one of those silly Logisys acrylic power supplies and lucked into getting one of the "better" ones (most of an input filter, bridge rectifier instead of 4 diode treatment, OK-sized heatsinks, etc.) and wanted to fill out what I can on the board + get some decent caps on there (especially the primary side since I highly doubt the ones in there are actually 1000uf). My questions are:

    1. How do I know what components to install re: the input filter? It seem to be missing an X cap, a resistor, and a Y cap.
    2. Where can I find a good heatsink for the bridge...
    12-06-2023, 09:59 AM
  • ClockChip
    How long were the displays on consumer-grade 1980s-era LED clocks designed to last?
    by ClockChip
    Does anyone know? A recent thread has got me wondering if the folks who designed and built consumer-grade LED clocks in the 1980s ever envisioned them still being used in the 2020s or if they were designed to give out (i.e. planned obsolescence) long before then?

    Perhaps a better way to phrase this would be: does anyone here still use a 1980s-era clock as a daily timepiece? If so, do you expect to get many more years out of it?

    (Along those same lines, if it does eventually develop a fault, are you likely to try to fix it?)
    07-25-2023, 07:50 PM
  • PennyLane
    Trying to locate a capacitor for a Skytec Crossover filter
    by PennyLane
    Hi
    I'm trying to locate what i believe to be Radial Electrolytic Capacitors 100v 82uf Non-polar for a Skytec Crossover filter.
    Thanks
    02-19-2025, 06:47 AM
  • J_T
    Operating frequency for motherboard common mode inductor/filter
    by J_T
    I have a question - I have replaced the PSU on my own iMac Pro. However, when removing the motherboard I knocked of a 120 OHM 30% 0.3A small surface mount common mode inductor/filter (~0602 size) in the ethernet circuit near the female RJ45 port.

    The closest match I can find on Mouser is 120 OHM common mode inductor at 100MHz - my question is this frequency correct for a motherboard? The schematic for the motherboard only provides '120 OHM 30% 0.3A' and the TDK part number does not return anything in google.

    Sorry, I am not experienced hence a basic question.
    ...
    01-04-2025, 05:54 AM
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