power supplies

  1. D

    Do You Design Power Supplies? We Want to Hear From You!

    Hi! This survey is being conducted in conjunction with EETech and All About Circuits. It is a good opportunity that might benefit some of our loyal readers and forum members. If you would be willing to participate in a 90-minute virtual video meeting where we will discuss your experiences and...
  2. Adamelli

    Attached to LED circuit, ESP32 does not boot up, I think. Detach from headers and re-attach, then it starts up fine.

    VXO7805-1000 DC to DC converter supplies 5V. When the circuit is attached via USB, there is a voltage drop to 4.5V on the 5V pin of the ESP32 (DevKitC-32D and pinout). I tried adding a 10uF capacitor between ground and EN (RST) as mentioned here. I then tried 330 uF. No luck. This seems to...
  3. khiljinaz

    SMPS circuit diagram for 20 amp 24VDC

    I need an SMPS circuit diagram to drive a DC motor of 24VDC 20Amp with an input voltage of 100 -240 volts. Consideration be given to commonly available Transistors/ MOSFET and switching controllers.
  4. Younes Thabet

    How to source a 5A of current to charge the gate capacitor of a power MOSFET?

    Hello all, I have been checking the EVAL-ADUM4146 evaluation board for the ADUM4146 gate driver. In this board, they are using a (2W, +15/-3, +93/-185mA) isolated DC-DC converter module which is the R12P21503D. And in the gate driver datasheet, it says: 11 A short-circuit source current (0 Ω...
  5. R

    Step-up Power Module DC-DC Boost Converter not working

    I have a boost converter that i want to use to step up the voltage from 12v to 15v. (https://surplustronics.co.nz/products/7589-step-up-power-module-dc-dc-boost-converter) my power supply is 12v 12.5A, and the maximum input current is 4A. to solve this, I have a 1.5ohm resistor in parallel with...
  6. I

    Siglent SDL 1030X DC Electronic Load Serial Programming Tutorials and References

    Greetings, As the title implies, I was wondering if anyone has any good references or tutorials for doing more advanced operations with the SDL DC Electronic Load Device. I've been using the EasySDL program for some simpler functions, like setting a CC for time values on some power supplies...
  7. K

    Noob question about PS rail

    I'm looking into this (attached) schematic for a bass amp. I'm not sure, why the low voltage supply (+-16V) has his own transformer windings, regulators etc. but then it's connected to the hugh voltage rail? (I've circled in red) Thanks
  8. K

    Issue with step up powe supply MC34063ADR

    Hi, I am trying to design a pcb powe supply that convers 24V DC to 34V dc (for Mbus communication) I have designed the folowing power supply as shown in the picture. When i turn it on it just starts heating up pulling 0.5A under no load (likely shorting or something). I have thecked the pins...
  9. P

    Step up 5vdc to 72 volt ac/dc

    1. I use a medical therapy device that needs 72 volt ac input. 2. Need to drive the medical device from a 5 volt dc Powerbank for mobiles that are readily available in markets 3. For that, I need to somehow step up the powerbank output from 5vdc to 72volt (either ac or dc) 4. The max load...
  10. MrsssSu

    Is this part a tiny step-up converter?

    Hi People :), This is a design I saw at here. Does this highlighted part a tiny step-up voltage converter after it has been stepped down by the transformer in order to prevent voltage drop when a heavy load is connected? Thank you
  11. L

    LM317 no reference voltage

    Hello all, This is my first post so forgive me if I break any rules, I am trying to create a variable voltage power supply using an lm317 but am running into problems. For starters, it doesn't seem that I have a vref voltage, when probed I get 0 volts across input and adjust. My second problem...
  12. ronit991

    Better approach for powering up sensor nodes ?

    I have a sensor node containing an MCU & radio running at 3.3 V and a sensor running at 5 V. What is the better approach for powering up the system (in terms of efficiency, stability, etc.) : 1. High Voltage Battery + Buck Converter or 2. Low Voltage Batttery +...
  13. V

    NCP1027 ATX power supply custom PCB not working

    I am newbie in AC supply PCB design. I have designed the PCB similar to NCP1027ATX evaluation board link. This is the link to pdf of my board schematic. The problem is that, at the output, the voltage is fluctuating and so that the microcontroller and other circuitry at the output not working. I...
  14. A

    SMPS POWER SUPPLY issue help needed

    Hello i am an engineering student working on a project of Switch mode power supply with outputs of 12V 1Amp .For this reason i have used power integration software to design smps supply circuit *(Schematic attached )with 12V 1 Amp required outputs. I have implemented this Circuit on PCB as...
  15. J

    Tips for bipolar power supply

    Hello, I need to design a linear regulated supply to power an dac output stage based on op amp. It must be a negative + ground + positive one. The problem I encounter is that I don't know wich topology to select between the first and second arrangement. I suppose that the first one induce a...
  16. emreanilterzioglu

    SMPS Vcc is not generating

    Hi guys, I am working on 12V 30A smps that has only 1V output. I haven't got board's schematic but I found one same like mine( Schematic Link). I measured high voltage capacitors (C2 and C3 on the schematic.) and bridge rectifier. They are working. Also checked power switching transistor on...
  17. L

    fixing possibly a bad power supplies board of a LED TV

    Suppose you have a bad LED TV with its power supplies board damaged. And this board is no longer available for sales. So how should you choose another similar power supplies board to replace it. What specifications you need to look at?
  18. Rahulk70

    Identifying the input power leads of a salvaged UPS transformer for projects

    Hello everyone, I'm writing this post mainly to help others who have had asked many questions in the past how to figure out the input supply leads (115V or 220V AC wires) on a salvaged UPS transformer. These transformers from a UPS are quite bulky and quite powerful and can be very useful in...
  19. S

    Calculating secondary turns on transformer

    I am designing a transformer for a high voltage converter. The topology is a push-pull converter. My method is to have a 200V primary generate 4x750V secondary windings, each feeding a voltage multiplier to generate 1500V. Then connect these in series and generate the final 6kV. So far I have...
  20. Lambo Av

    How to shut down a wind power plant?

    Just curious, how do they shut down those wind power plants given their tall structure? What are the procedures to do it? Thanks.