Learn about Class D amplifer

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  • dicky96
    What 'class' is this Hill Audio DX3000 Amplifier?
    by dicky96
    Hi guys, this is general query really

    So I have a Hill DX3000 3KW audio amplifier here.

    It has a topology/design like a class A/B but all the banks of output transistors (10 transistors in each 'side' of the channel) are NPN.

    I was wondering what class this is. It doesn't fit the description of class A.
    It also doesn't match class A/B or B amplifiers as all the examples I see have a complimentary output stage desigs (NPN/PNP) and clearly is not G, H or D

    I looked for 'class A push pull' but that didn't tell me anything either
    ...
    05-04-2022, 04:20 AM
  • japlytic
    Certain "Class 2" HDMI cables can be marginal at 4K 60 Hz
    by japlytic
    For some time, a "Class 2" HDMI cable (part number BN39-01583B) supplied with a Samsung 4K 60 Hz display sometimes causes the display to overlay a few horizontal lines of flickering pixels of random colours and sometimes drops out, particularly on content requring HDCP.
    Since changing the cable to a thicker Class 2 unit, this problem has not occured again - do you know of other marginal "Class 2" HDMI cables supplied with displays?
    09-06-2023, 08:50 PM
  • eliasseverholt
    Looking to learn about troubleshooting my Lenovo L14 Gen 1
    by eliasseverholt
    Hello!

    Unfortunately my Lenovo L14 Gen 1 (motherboard NM-C741) was involved in a terrible mishap. At first, one of my friends accidentally spilled coffee on it which made some of the ports stop working but the computer worked fine otherwise. After that I stupidly opended it and forgot to disconnect the battery... One thing leads to another and I accidentally short it between two components (unfortunately I do not remember which components). After that I get nothing, no charging indication, no boot indication, no fan spin, nothing.

    So I'd love to learn my mistakes and...
    12-19-2023, 06:13 PM
  • presario425
    RIFA Class Y Capacitor remedy
    by presario425
    Hi all!
    I have a piece of gear with a Power-one SPL130 power supply in it. On the primary side, there is a very tiny (about the size of your thumb nail) RIFA Class Y capacitor, 2.2 nF. I'm not too sure about the condition (whether or not it's cracking) but I do know that it's there.

    I'm aggregating information as to how I should remedy this. It hasn't exploded yet, but that's what I'm trying to avoid.

    I've never seen a RIFA class Y safety cap self destruct (or at least it hasn't been documented in the past). However, it's not worth the risk to leave it in there....
    05-19-2020, 06:53 PM
  • Lee Majors
    Snubber Capacitor Vs Class X2 Capacitor
    by Lee Majors
    Is a snubbing capacitor fine to use in place of an X2 suppression safety? The only real difference I see is that the dV/dt is around 3 times higher than the recommended Class X2. Is this a positive or negative issue in this turntable audio device? See C601...
    10-30-2023, 03:32 AM
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