1. T

    understanding the diode demodulator circuit?

    Hi everyone, I watch this video, min 3:30 upward, and it says that the demodulation of AM is when the diode is in the reverse biased but then the current flows!!! isn’t tit the current stop flowing when the diode is reverse biased? Crystal radio circuit analysis/diode demodulation (8-Analog...
  2. Ajaygoshbin

    Simulation of ultrasonic sensor

    This is a system to detect any intruders using ultrasonic sensor . The buzzer should ring if the timer gets triggered . Somebody help me with the simulation using proteus or any other softwares
  3. Wikked

    Need help with a diode question on a ASRock B550AM AMD motherboard

    Hello, I bought a motherboard in hopes to fix it; I've been working with electronics for most of my life, soldering for about two years now and fixing games and electronics for a little more than a year. I was hoping to use this motherboard, I bought it cheap on Ebay and fix these three simple...
  4. S

    Switching between two 12V power supplies

    Hi everyone, I am looking to switch between two 12V DC power supplies without having an actual “switch”. I’d like for 1st power supply to switch to the 2nd one when the 2nd one is turned on. I believe the current rating for the system is 12A. I’ve read about using ORing controllers, diodes...
  5. A

    Newbie question regarding PCB fry.

    Hi all, I am new to electronics and designed my first circuit. However I fried one of my PCB and trying to determine the root cause. What I am suspecting is caused by a diode polarity that I missed. The PCB was working fine for about an hour or 2 without any issues. Then suddenly it stopped...
  6. usmansa1

    Why reverse current in equation while diode is forward biased ?

    Hi all, I read that ideal diode equation and it is given as in above equation Is is the reverse saturation current or dark saturation current (According to this website). And according to most of the study which I did this reverse saturation current doesn't exist while the diode is...
  7. thedarkpty

    unknown stud diode

    Hello, does anyone recognize this brand of diode? Apparently it is from China and I have found a very similar diode brand but I have not found more in google. It appears this is a threadless version...
  8. Thilzz

    this is to design a limiter circuit.. anyone know give your ideas...

    the requirements are, The input signal of the limiter Vin is a sinewave having a maximum amplitude of 10V and a frequency of 60Hz. The input signal Vin is fed to the circuit through a resistor 500 ohm. and if Vin<=-9v , Vout = 10v and -9v<=Vin<=6v , 0v<=Vout<=10v and Vin>=6v , Vout = 10v are...
  9. Younes Thabet

    What should be the readings on DMM when testing a transistor ?

    Hello all, I have read some articles on how to test a transistor with DMM diode mode and what I understand is that measuring from Base (red probe) to Collector\Emitter (black probe) should give a reading and all other probings (C-to-E, E-to-C, C-to-B, E-to-B) should give O.L. But that isn't...
  10. Younes Thabet

    Can 2 diodes and a capacitor be used to generate a negative voltage?

    Hey! I came across this circuit (see attached picture) which is used to create a -15V from a 15V rail then used as an input for a negative voltage regulator. I couldn't understand quite how the circuit works! Can someone explain this for me please? PS: the 2 diodes are in the same die, and i...
  11. BrokenBones108

    Broken guitar pedal project (Bitsbox muff)

    Hello, About a year ago I bought a Muff Guitar pedal project from Bitsbox. It was working well untill it broke last week. I took it apart and noticed the ground wire coming from the output has been pulled out of the board (the output became lose and must have spun enough to pull this off). Now...
  12. irfancaglayan

    LTSpice diode list does not update

    I have this lab homework in which I have to simulate a basic circuit using 1N4007 type diode. I have edited the standard.dio file as I should but the "Pick Diode" list in LTSpice does not update. 1N4007 does not show up. I am adding screenshots of the file directory and the line that I embedded...
  13. T

    What are some easy ways to block over voltage and regen current from the load to the power supply?

    I have a power supply that automatically shuts off when an over voltage condition occurs. In my case, my load is a DC Brushless 3 phase motor (draws about 600 W) and it's triggering an over voltage condition for the power supply whenever I slow it down. If I don't care about efficiency and I'm...
  14. J

    Failed diode function generator

    Why would a diode function generator output a distorted waveform at high frequencies(>50kHz)? In theory and simulation, it should be fine, but when testing, the diode fails to perform properly at higher frequencies. Any ideas?
  15. Anna Swinemar

    [SOLVED] Unidentifiable SMD Component (possibly Diode)

    Hello, I am working on my 2018 GMC instrument cluster. It has a parasitic current draw that drains the battery within 3 days. I found this part which to me, looks like and SMD diode. It is reading "OL" in circuit and out of circuit. See attached photo. I have tried looking through the SMD Code...
  16. Anna Swinemar

    Unidentifiable SMD Component

    Hello, I am working on my 2018 GMC instrument cluster. It has a parasitic current draw that drains the battery within 3 days. I found this part which to me, looks like and SMD diode. It is reading "OL" in circuit and out of circuit. See attached photo. I have tried looking through the SMD Code...
  17. B

    How to supply power to a diode or laser pointer for a laser and be able to vary the voltage?

    Hello! I am a student working on a portable laser project. The laser is going to be powered by two lithium-ion batteries at 3.4A capacity and 3.7 Nominal voltage (4.2 charging voltage cut-off and 2.5 discharging voltage cut-off). I'm using voltage regulators to step up or step down voltages for...
  18. Rdca82

    Help with DIODE please

    Yeah, so I'm using the XL4015 with a 100w solar panel. I have the XL4015 set to 7.35vdc to charge a SLA 6v lantern battery. The diode is working, but the current is limited to 200mA, instead of the full 300+ mA it would get if there was no 1N5822 diode in series, to prevent the darkness at...
  19. MEngAhmad

    Differentiation of Leds behavior due to light or color intensity ( fade in / out and slow or fast blinking?

    Dear All, Currently, l am working on a project where l need to differentiate the led behavior due to light or color intensity. The aim is to identify the end of fade in /out and the beginning of slow blinking in sequential processes. l want to identify how long fade in/out and slow blinking...
  20. E

    I need help with coil gun circuit

    Hello, I have been making circuits as a hobby for 2 years now mainly focusing on trying to make a coil gun, and tried and failed 7 times now, and I am in desperate need of help with the circuit, if you see anything wrong with my diagram please respond as soon as possible. I bought most of the...
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