power supply

Hello everyone, I recently aquired a marshall Kilburn speaker on a retail website which said it was properly working. The issue is that it isn't, I asked the guy who sold it to me and he said he used it mainly on sector because the battery wasn't working (15-20 minutes autonomy instead of...

I have four identical LED Christmas light strings, each originally powered by a 3 V / 525 mA wall adapter. Measured with a bench supply: At 3.45 V (original adapter voltage): ~680 mA At 3.0 V: ~260 mA I bought a single adjustable 3–12 V, 5 A DC supply to power all four strings in parallel...

Hello, I'm trying to design this simple power supply. The load voltage slightly drops or sags as I increase the load current. When the load current is 1 A (or above 1 A), the output becomes 9.3v which is too low to my application. What can I do to keep the load at about 11v even when the load...

Building a networked device and want a dual power supply option. So, I’m working on a redundant power design based on Silvertel’s app note, using the AG9205 PoE module (+5v_POE on schematic below) and a Murata OKL-T/3-W12P-C 12V to 5V DC/DC converter. PoE should have priority: if both power...

Hello! I’ve been searching for a reliable transformer-less power supply circuit for quite some time now. After going through countless circuits on Google, I still can’t find any compact designs that seem trustworthy. Companies have been creating super compact and safe power supplies for...

Hello All! I'm in process of troubleshooting a Fly-back controller/transformer design and I wanted some more experienced eyes to help if possible. Right now, I'm having issues with the output voltage of the transformer, it supposed to output 24VDC but when i put different combination of load...

I have an unused 800W PC power supply. I would like to know if there is any way to modify it so that it has a single output at 40 or 50V. I don't know if it is possible to use a single output of the ones that the power supply has or if they can be "combined" into one. For example, the power...

Hi, I bought a device that doesn't work, I hope you can help me fix it. The device is a Colloidal Silver Brewer. It has two alligator clips connecting to two silver wires, it is supposed to send electricity into the silver wires which are placed in water, and emit nano particles of silver...

Hello dear I have a sat recever with this power supply All rectifier diodes burn and i replace them and also 5l0380 R was burned and i change it with a new one but it burn. I checked all components around it and semes theme's correct What causes the switch IC to burn The pictures in...

Hi, My requirement is that I have an input of 10VC to 32VDC and I have to design a power supply that can convert the said input to 12VDC with a capability of sustaining load of 310mA minimum. As i am looking for a cost effective solution it will require me to design a discreet buck boost...

I am trying to repair an AC-DC switching power supply with my basic knowledge of electronics. (220 v AC to 34v and 12v DC) The problem seems to be the MOSFFET (10N60c), It shorts and then the fuse, a capacitor and some resistors blew. It seems like I would be able to fix it, but the SMD...

I got a 3 wired HP charger that i want to make into a power supply. The wire colors of the charger is blue, black and white. How do i approach it? How do i deal with the third wire?

Hi, I'm a beginner so please understand if I... you know... don't understand. I have the attached circuit built and when I run the motor it works fine, but when the motor stops it (sometimes) resets the microcontroller. I know it is not too little current from the supply, but more likely the...

I didn't need one, but it came up on my "coins" page and I couldn't pass up the deal. $9.01 in discounts, reducing the price to less than $33. I paid closer to $40 for the other 2 I purchased. I don't remember purchasing from this seller before. In the past, I've ordered low priced power...

Hi, everybody, I want to control two Peltier elements (up to 15V, max 6A each) with an Arduino. Right now, I am able to control them using PWM and a MOSFET (IRLZ44) to modulate an incoming constant voltage signal. By varying the amplitude of the PWM signal at the Peltier, I recognized, that I...

Hello guys , i am a novice engineer and i have an old linear power supply for a video door phone system. The P.S. has a 12VAC output (good) , a +15VDC output (bad) and a +18VDC (good). DC outputs share same GND. The problem is when there is no load on GND and +15VDC output i measure a voltage...

Hello all, I have a Samsung washing machine noise filter that I think has gone bad, I will post a picture and I was hoping one of you could tell me if I was doing my testing correctly , sorry for the bad picture, I am drawing a diagram that will be flat and I will post it later, but my question...

Greeting Guys, Please advise me to get the best power source for the deadbolt / electronic gate lock system... I want to get the following: - 12v Fixed voltage 2-3/+- volt no issue - 2 amp peak when required at once - Compact Size if possible I am confused about using LED Driver 220vac...

Currently working on a project to design a personal transportation device and am in the process of teaching myself about motors, receivers, etc. I am using 2 of these motors: https://www.digikey.com/en/products/detail/ebm-papst-inc/VG-ECI6340BK1-P63-1-5/9598038 But, I am struggling to figure...

Hello everyone, I was sitting in front of my computer when suddenly my monitor (LG 49WL95C-W) turned off. I opened it and started troubleshooting. It looks like the power supply is the problem because if you connect it to power, the 3.15A fuse blows immediately. I live in Germany and therefore...