Circuit Scribe Draw Circuits Instantly

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  • sew333
    Can i plug pc on this apartment with older fuse box?
    by sew333
    Hello. I will be buying new apartment to live. But fuse box is older. Not the newest.

    And my question. It will be fine to plug pc in this new apartment with that fuse box,i think it is aluminium,right?

    PC WILL BE: Rtx 4090,14900K,1600W PSU

    It looks like this ( screen from internet ). Looks like this,not sure i dont take a pic from there. Can i plug pc with that one?

    screen of this:


    room:




    Someone said this to me.

    1

    "I would get advice from a local electrician...
    03-29-2024, 05:37 PM
  • Astonished
    Fixing the Charge Circuit of the Batteries of the DC Motor
    by Astonished
    Hi friends of electronics

    What you see in the video and pictures attached is the circuit for charging the batteries of a DC motor.

    The problem is that this circuit cannot charge the batteries (3 1800mAH NiMH batteries) any more. When the circuit was OK, its green LEDs lit up one at a time to show that the batteries have charged more. But now that the circuit is flawed, LEDs light up as you see in the video and at the same time successive beeps are heard.

    Please help me fix this circuit.

    (the datasheet of the IC: https://pdf.datasheet.live/28...
    01-28-2025, 06:24 AM
  • CPUFiddler
    Acer Nitro 5 AN515-45 not charging
    by CPUFiddler
    Hi there. I am trying to repair an Acer Nitro 5 AN515-45 and it's giving me some trouble. I have access to SMD rework station, variable power supply, digital oscilloscope, thermal camera, multimeter, stereo microscope.
    This laptop will boot and run from the power brick and/or the internal battery, but it will not charge the battery. NirSoft BattInfo tells me the charge/discharge currents, so I'm confident in saying that it's not charging. In addition, there's no increase in voltage at the battery connector when the laptop thinks it's charging, not even a few millivolts.
    I've downloaded...
    1 Photo
    03-19-2025, 07:44 AM
  • rddube
    Lenovo L490 Ram voltage circuit malfunction
    by rddube
    Hello friends,

    Looking for some guidance here. The RAM voltage circuit on this motherboard keeps burning out PU301 which is a RT8231AGQW. Copy of the board with the burnt chip attached with some voltage measurements and copy of the schematics also included.

    I think I've checked almost every component in the circuit, but when I change the RT8231, the laptop starts I have 1.2V on the inductor for about 10 seconds and then the RT8231 goes south and no more voltage on the inductor. All other voltages on the laptop are good, this is the only one conking out for a reason I...
    07-15-2025, 04:41 PM
  • Tarot Superstars
    Short Circuit tester
    by Tarot Superstars
    Hello.
    I have seen a short circuit tester made with 3 * 9V batteries, a voltage limiter component and a resistor connected to the probes of a multimeter.
    The theory is that the meter becomes sensitive enough to read very low resistances and the lowest resistance to ground on a circuit is likely to be a short circuit in that area.

    Link
    The Amazing $1 Short Finder Upgraded! Convert ... - YouTube
    https://www.youtube.com/watch?v=0eixDdCpiO4

    My multimeter isn't normally sensitive to very small resistance, but when I put a 1 mega ohm resistor...
    09-25-2023, 09:11 AM
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