I'm working on a LED circuit board and am testing a 8C 1A component, it has a wide ground tab on one side and 3 tabs on the other and the center tab is grounded also. the circuit board has it as a V2 component ,so is this a mosfet or transistor ?
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Maybe 7805 in sot-89...Attached FilesComment
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If it's a transistor, that tab and center pin are probably the collector. The pin-out might be, left to right, Base-Collector-Emitter. There would be a P-N junction from base to emitter and from base to collector.
If it's a MOSFET, the tab and center pin would be the Drain. The pin-out might be, left to right, Gate-Drain-Source. Using an ohm meter, there would be very high resistance or an "open" between any two pins.PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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Hi reader,
I'm trying to control a pc fan speed by giving PWM to the gate of a n-mosfet.
1) generation of a clock with a 555 timer (~ 1,5 kHz, as seen in the datasheet, fig.12) (Vcc = 6V).
Output to TRIG of second timer (pin 2) + red led
2) generation of a PWM with a second 555 timer (as seen in the datasheet, fig.18), CONT (pin 5) modulated by a variable 10k resistor (Vcc)
3) Using output of second timer to "pulse" n-mosfet gate (MDP13N50) + yellow led
4) pc fan (12V, 0.18A) in series in drain-source of... -
I tried to use this method:
Testing an N-channel MOSFET:
Step 1: Discharge the Gate (turn off the MOSFET)
Place the black probe (COM) on the Source (S) and the red probe on the Drain (D). The multimeter should show no continuity (high resistance or "OL" – open line).
Then, touch the black probe to the Source (S) and the red probe to the Gate (G). This discharges any stored charge in the Gate, turning the MOSFET off.
Step 2: Charge the Gate (turn on the MOSFET)
Now, place the red probe on the Gate (G) and the black probe on the...09-27-2024, 03:31 AM -
Hello everyone, I recently found this badcaps site and super Learn Electronics Repair youtube channel. And I wanted to learn how to troubleshoot power supplies and VGA cards and how to practice soldering, since I already have a properly defective piece of them. I am currently trying to solve two problems:
I have a Gigabyte GV-RX460WF2OC-4GD type card. I managed to find the faulty MOSfet (AON6414A) on it, which I replaced. The card starts up, but after about half a minute, the MOSfet in the same position will be shorted again. Is it possible that the PWM controller driving the MOSfet... -
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... -
Hey guys,
i have a asus motherboard here and as the title says after the first mosfet (in the picture) there is nothing more than 3.15v.
I injected 19v and max. 1 amp at the charging port and there is not voltage drop or smth. It's just taking 19v and 1 milliamp.
Then i tried to inject 19v and max 1amp after the current sensor and there it first takes 19v and 4 milliamps and after 2 seconds it is taking nothing (no current).
I measured on the coils on board everything seems fine. Also the main power rail is not shorted (infinite resistance).
Now i thought something...
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