Mixed Circuit Archive

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
Previous template Next

Related Topics

Collapse
  • 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
  • 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
  • M1NEBLANK SHOW
    MSI B250 Gaming M3 Short circuit in CPU power supply circuit
    by M1NEBLANK SHOW
    Hello. MSI B250 Gaming M3 board, short-circuit on the power supply. Found a problematic mosfet VQ1
    (N-PK616BA_PDFN8-HF) soldered it out - short circuit is gone. I replaced VQ1 + VQ5 (N-PK632BA_PDFN8-HF). VQ1 was replaced with PK618. After starting attempt VQ1 is lit again. What can be the problem? In the driver?

    Schematic and Boardview here
    ...
    04-04-2025, 03:57 PM
  • прямо
    Viper22A 5VSB circuit
    by прямо
    So I have a cheap non working ATX PSU that I was learning to repair a decade ago. At the time, it blew the main fuse, bridger rectifier, NTC, and primary 9A 900V MOSFET. Replaced all except the MOSFET. 5VSB came back online. Then I poked around in it so much, measuring components one by one to a point I accidentally made the 5VSB circuit primary side went bang. Blown the AP8022 (Viper22A) PWM chip, along with a low resistance resistor and the PC817 opto isolator. I replaced them all.

    In the process of poking around, I also lost a zener diode that stabilize the voltage coming from...
    3 Photos
    01-13-2024, 07:05 PM
  • chth96
    Is ESR value different between on Circuit and off Circuit?
    by chth96
    A few days ago, I purchased MESR-100 ESR meter, and When I measured a SMD capacitor on circuit,MESR-100 showed ESR value of 30, But I managed to desolder this SMD capacitor from circuit and measured it then MESR-100 showed ESR value of 18.
    I also measured it with Mega328 Transistor Tester, and It showed ESR value of 17.
    Is my MESR-100 defective, if the ESR value is different between on Circuit and off Circuit?
    11-19-2022, 04:32 AM
  • Loading...
  • No more items.
Working...