1. 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...
  2. 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?
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. Swaysceptile

    How do I calculate the voltage across a diode?

    How do I calculate the voltage across a diode using ideal, practical, and complete models? What are the steps? I can't find any good tutorials/resources on the internet. I know the formula, but kinda confused with those many resistors. Hope someone could help
  10. felastian123

    help with a circuit (Rectifying circuit)

    Hello, for the following circuit I am asked to calculate the average current through the diode, the capacitor and the load in permanent regime, in addition to finding the average current in one of the diodes with the values of its repetitive peaks, I would appreciate it if someone Can you give...
  11. taharat

    12V 2A power supply with 1M ohm resistor, 1uF 250V capacitor and 1N5408 diode

    Hello everyone. I have seen many videos on YouTube where they built a capacitor based 220V AC to 12V DC power supply. But those were not sufficient for my project. I am eager to build a 12V 2A power supply where the input will be 220V 50 Hz using the following components: 105K 250V ceramic...
  12. M

    Nokia Earbuds BH-605 not charging

    Hello, I have this issue with the case of the Nokia Earbuds BH-605 where the battery is not charging anymore. I noticed that a diode has fallen off but I can't find it anymore. Below are some pictures. I'm an absolute novice regarding to electronics, is there a way to determine which diode I...
  13. mungs

    The relation between Vin and Vout (diodes circuit)

    Hi, can anyone here tell me if the function I found that relates the Vin to Vout is right? So I made a mesh analysis to find the current in the first mesh (left to right) and in the second and finally got that the Vout = (2/11)*Vi +6.328 (is it right?) threshold voltage = 0.7V
  14. T

    Diode usage in SPI modules

    Hi All, Hoping that someone can put me out of my misery. I have been searching the internet for the past 5days for an answer to this question and feel like I am starting to lose my mind. Can anyone explain why the attached schematic has a 1N4148 on each of the SDI_5V, SCLK_5V and CS_5V lines...
  15. Younes Thabet

    How to import a third-party SPICE model in LTSpice that doesn't have a generic component!?

    Hello all, I don't know if i am supposed to ask this kinda questions in this thread but i am going to anyway! Tried importing a spice model for BAV70 (Dual-diode SOT23 package) after seeing some tutorials, all of them use a a generic component that represents the symbol of the SPICE model...
  16. jacob_c

    Can you give me some hint for my PSPICE project?(transformer, diode)

    The project is about designing a transformer that converts 22V AC to 1V AC and connect it to voltage doubler as V_in So here's my schematic and simulation result. I'm having trouble with analyzing the result. The D1N914 diode that is recommended for this project, had Vd,on of about 930mV when...
  17. D

    Pcb mount version of n4148 diode?

    Hey, so I've accidentally killed a diode on my board and I have the schematic, however I cannot find the specific part online that needs replacing, and help finding the correct part or alternatives would help a lot. I'm pretty sure the diodes are n4148 s I've attached the part of the schematic...
  18. James_1

    Role of the two diodes in this circuit ?

    So this is the circuit that I have . I managed to define what his function is. The last question that I had to answer is what role does the 2 diodes Dz and Dh have in our circuit ? I'm not quite sure whether they do have a specific function in this circuit or should I just give a general...
  19. Parapala23

    2 +power source to 1LED load?

    It's working fine right now but I just want to ask if it is a safe idea? I used 1n4001 diode in each power source line so that the current flow won't jump to the other power source and vice versa.
  20. T

    where to find the R_ESR of diode in Datasheet?

    I have been searching how can I read some important inofrmation for my PLECS model regarding this diode but could not find it. here is the link. I looked on google and I find some youtuve video on how to read a datasheet of diode but did not mention the resistance. link of the diode:diode