psu

  1. Buck regulator with LM2596-adj got damaged.

    I build a circuit with LM2596HV-adj (smd IC). mounted it on a small heat sink. Input 37v dc input cap 100uf, output variable from 1.25v to 15v dc, output cap 220uf +330uf, inductor 100uh (toroidal). I used 2 flyback diodes (fast diode), one across output one between output pin and input pin of...
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    PSU "Schematic" help me understand AC/DC Bridge Rectifiers, Proper Grounding, and Series AC Connections

    Although my schematic is not standard I'm trying to build a proper PSU for my Alactron 500 series rack since PSU's for this model are no longer being produced. I need help determining if my design is correct, especially regarding grounding and connections for AC/DC, bridge rectifiers, and DC-...
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    Help fixing Panasonic TNPA5808 (SMPS) low voltage issue

    I'm trying to fix an old Panasonic LED TV, mainly for educational purposes. While I was checking voltages on the P-Board I got to know the voltage of the SRV-16V rail is 13.2V (with and without dummy load). Both 16V and 24V rails are bit lower than specifications. However the 5.3V standby line...
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    Plug'n'play PSU...

    Littered around my house I have a lot of DC and AC power sources - car batteries, power tool batteries, USB 5v wall adaptors 12V DC wall adaptors, old PC power supplies, 12 and 24V AC wall adaptors etc etc I also have a collection of old mains transformers I could use Converting AC to (dirty...
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    Dead Acer Monitor

    Hello everyone, i have an old acer monitor "AL 1916W" it was totally dead but after i replace some bad caps now the led turns green and red when it's in sleep mode. but the picture at all no backlight or a dim picture in the LCD. i just wanted to know how can i test the backlight and the lcd...
  6. Inductance need of common mode choke

    I got a damaged ATX PSU with primary transistors (13007) blown. When opened to repair I found that it doesn’t have EMI filter (markings present on pcb). I decided to include one and designed as attached pic. As not an expert I’m not sure about the required values of X caps and inductors. The...
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    PSU(Meanwell IRM-01-5) protection

    Hello guys! Since i am new here first I would like to apologize if i did draw this schematic wrong(i.e. lines do cross, etc.).It is a few days that i am using this online editor so i am still in the learning process and need to gain a bit more expirience. I created followed circuit:555 timer...
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    pc power supply only 5vsb supply

    hi, i put the resistor R23 which was smd, but i put through hole resistor and it started working and it stopped becoz the solder came out,its too difficult to solder with my big solder point .. when i tried to solder again the whole strip came off teared apart.. ,please help me in identifying...
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    ATX PSU Silverstone ET550-G cannot power on again after thunderstorm

    Hello members, The PSU was running when a lightning bolt struck far away. turned off and cannot power on again. so probably overvoltage exposed. I opened the PSU to replace the fuse. it is a ceramic one, therefore I cannot see at first sight if it is blown. Also removal seems unnecessarily...
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    unregulated power supply - unstable output or no output at all

    This might be a super obvious question to most over here, but I know nothing about power supplies, so please bear with as I try to explain what is going on. I have one of these SPS705 68VDC power supplies running inside a rather simple stepper motor control box...
  11. Testing multiple output IPSU with dummy load

    Hi everyone! I'm currently working on a new project that consists in developing a dummy load to test a multiple output IPSU, it has 9 rails and their voltage ranges from 1.25V to 5V, the output current should be less than 1A, but for testing purposes let's consider 1.5A. The idea is to have...
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    Transistor regulated power supply problem

    this is the schematic ive built. Its designed to give an adjustable output of 35-50v, the question is which part do i have to change to make it work below 35v. I have this connected to a 24v transformer and all it gives out is 35v(no matter the pot position). I know this is very simple for some.
  13. AC-DC PSU 15V, 2A - Where to buy a compact module?

    Hi, Does anyone know of something to convert 240V mains to 15V DC at upto 2A? I want it to be as compact as possible. I've been looking for PCB mounted modules but the price and size of them seems ridiculous. For example; Farnell sell a VTX-214-030-115 for £20. You can buy a whole bench PSU...
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