LED power supply

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  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #21
    Re: LED power supply

    Just looking at the photos it looks like its barely even touching the chassis, it needs to be firmly pressed against it to cool.
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

    https://www.facebook.com/Telford-Tel...7894576335359/

    Comment

    • michael dranfield
      Badcaps Veteran
      • Jan 2016
      • 232
      • England

      #22
      Re: LED power supply

      Here are mine stuck to the ceiling on pvc trunking, you will notice the fluorescent light on the ceiling, as my place is 1700 sq ft I dont have them on any more the whole place is lit with LED s put 12 volt to each end of your strip because if you dont the voltage will be lower at one end and the led s wont be as bright due to voltage drop , my first psu blew as the main reservoir cap dried out so I would replace this as well.
      Attached Files

      Comment

      • ReeceyBurger123
        Never Give Up !
        • May 2014
        • 7325
        • Britain

        #23
        Re: LED power supply

        Originally posted by michael dranfield
        Here are mine stuck to the ceiling on pvc trunking, you will notice the fluorescent light on the ceiling, as my place is 1700 sq ft I dont have them on any more the whole place is lit with LED s put 12 volt to each end of your strip because if you dont the voltage will be lower at one end and the led s wont be as bright due to voltage drop , my first psu blew as the main reservoir cap dried out so I would replace this as well.
        Nice shop there
        Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

        https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • diif
          Badcaps Legend
          • Feb 2014
          • 6978
          • England

          #24
          Re: LED power supply

          It was securely pressed up against the heatsink with paste and a clamp and the solder was fine.

          Does this look like a suitable replacement ?
          http://uk.rs-online.com/web/p/mosfet...stors/7192822/

          Comment

          • ReeceyBurger123
            Never Give Up !
            • May 2014
            • 7325
            • Britain

            #25
            Re: LED power supply

            Yeah maybe get a higher current one ? Also replace primary caps too as well as the resistor, diodes and possibly controller.
            Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

            https://www.facebook.com/Telford-Tel...7894576335359/

            Comment

            • diif
              Badcaps Legend
              • Feb 2014
              • 6978
              • England

              #26
              Re: LED power supply

              Originally posted by ReeceyBurger123
              Yeah maybe get a higher current one ? Also replace primary caps too as well as the resistor, diodes and possibly controller.
              Those two Dongbaohe ?
              Could you suggest a better replacement ?

              Yeah, nice shop Michael, look at all those storage drawers

              Comment

              • stj
                Great Sage 齊天大聖
                • Dec 2009
                • 30994
                • Albion

                #27
                Re: LED power supply

                btw, that carbon resistor is not rated for a high enough voltage, you need a 400v+ rated part there

                Comment

                • michael dranfield
                  Badcaps Veteran
                  • Jan 2016
                  • 232
                  • England

                  #28
                  Re: LED power supply

                  Originally posted by diif
                  Those two Dongbaohe ?
                  Could you suggest a better replacement ?

                  Yeah, nice shop Michael, look at all those storage drawers
                  What you see is just a tiny part , I can park 3 cars inside , 4 if I tidied up a bit !
                  Got more semis than a component wholesaler, the back room has no place left on the walls for any more draws !
                  I will post some pics tomorrow .

                  Comment

                  • diif
                    Badcaps Legend
                    • Feb 2014
                    • 6978
                    • England

                    #29
                    Re: LED power supply

                    Originally posted by stj
                    btw, that carbon resistor is not rated for a high enough voltage, you need a 400v+ rated part there
                    Thanks, I'm guessing you men the one that isn't there any more ?

                    Originally posted by michael dranfield
                    What you see is just a tiny part , I can park 3 cars inside , 4 if I tidied up a bit !
                    Got more semis than a component wholesaler, the back room has no place left on the walls for any more draws !
                    I will post some pics tomorrow .
                    Oh wow, i always get a nice warm glow when i have the components to hand and don't have to order. Must be cool to have just about everything you'll ever need....and more

                    Might be easier to drive to you than RS in future lol.

                    Comment

                    • stj
                      Great Sage 齊天大聖
                      • Dec 2009
                      • 30994
                      • Albion

                      #30
                      Re: LED power supply

                      Originally posted by diif
                      Thanks, I'm guessing you men the one that isn't there any more ?
                      yes, but i cant make out the colour-codes from the first batch of foto's
                      you need to use a 500v metal oxide job because it's connected to the rectified mains.
                      it looks like it's(was) acting as a sort of pullup/down resistor on the gate/base

                      if it had too low a resistance the current when the device was on could have slowly done it in.
                      without it the transistor could have jammed on and blown.

                      Comment

                      • SteveNielsen
                        Retired Tech
                        • Jun 2012
                        • 2327
                        • USA

                        #31
                        Re: LED power supply

                        I got an LM317 regulator smoking one day powering up a string of 8 LEDs taken from a small flashlight. I guess it's time for a better heatsink and new paste

                        Comment

                        • diif
                          Badcaps Legend
                          • Feb 2014
                          • 6978
                          • England

                          #32
                          Re: LED power supply

                          Originally posted by stj
                          yes, but i cant make out the colour-codes from the first batch of foto's
                          you need to use a 500v metal oxide job because it's connected to the rectified mains.
                          it looks like it's(was) acting as a sort of pullup/down resistor on the gate/base

                          if it had too low a resistance the current when the device was on could have slowly done it in.
                          without it the transistor could have jammed on and blown.
                          Brown, Black, Orange, Gold. 10kohms

                          http://uk.farnell.com/panasonic-elec...tedCategoryId=

                          Comment

                          • stj
                            Great Sage 齊天大聖
                            • Dec 2009
                            • 30994
                            • Albion

                            #33
                            Re: LED power supply

                            i wonder how much current that could pass at 360v?
                            it was a 1/4w carbon job.

                            Comment

                            • SteveNielsen
                              Retired Tech
                              • Jun 2012
                              • 2327
                              • USA

                              #34
                              Re: LED power supply

                              Ohm's law says 12.96 watts. A 1/4w ain't gonna cut it.
                              Last edited by SteveNielsen; 02-09-2016, 09:11 PM.

                              Comment

                              • stj
                                Great Sage 齊天大聖
                                • Dec 2009
                                • 30994
                                • Albion

                                #35
                                Re: LED power supply

                                that could explain the failure then!
                                it's pulsed, but the fact that standard carbon resistors arent rated for that voltage dont help!

                                Comment

                                • michael dranfield
                                  Badcaps Veteran
                                  • Jan 2016
                                  • 232
                                  • England

                                  #36
                                  Re: LED power supply

                                  Originally posted by diif
                                  Thanks, I'm guessing you men the one that isn't there any more ?



                                  Oh wow, i always get a nice warm glow when i have the components to hand and don't have to order. Must be cool to have just about everything you'll ever need....and more

                                  Might be easier to drive to you than RS in future lol.
                                  Take a look at this , I have to stand on a chair to get to the draws next to the ceiling !
                                  Attached Files

                                  Comment

                                  • michael dranfield
                                    Badcaps Veteran
                                    • Jan 2016
                                    • 232
                                    • England

                                    #37
                                    Re: LED power supply

                                    Originally posted by diif
                                    Those two Dongbaohe ?
                                    Could you suggest a better replacement ?

                                    Yeah, nice shop Michael, look at all those storage drawers
                                    Car in for a service as well !
                                    Attached Files

                                    Comment

                                    • diif
                                      Badcaps Legend
                                      • Feb 2014
                                      • 6978
                                      • England

                                      #38
                                      Re: LED power supply

                                      Wow, very nice indeed. Impressive stuff.

                                      Comment

                                      • diif
                                        Badcaps Legend
                                        • Feb 2014
                                        • 6978
                                        • England

                                        #39
                                        Re: LED power supply

                                        Originally posted by michael dranfield
                                        Car in for a service as well !
                                        Now that's just showing off and taking the p*** lol

                                        Comment

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