Questions tagged [power-supply]

An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.

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3
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2answers
533 views

Efficient 60v to 12v DC-DC

I'm on the process of building a new version of my ebike electronic systems and I'm searching for a way to lower the voltage of the battery (13s = 54,6v fully charged) to 12v/5v for the accessories ...
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2answers
99 views

Replace mains 12v power-supply with 12v battery

A Yamaha digital piano is powered by a mains power-supply. The power-supply states the following input/output values: INPUT 100-240V~50/60Hz 0.5A OUTPUT 12V === 1.5A (Where I have written === there ...
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1answer
29 views

switch-mode power supply

First post here. I'm making a DC/DC converter which will generate an output of 19.5V 18A. Its a synchronous buck converter with the LM5145 TI chip. When I have light load on the converter the output ...
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1answer
47 views

Y cap between AC ground and DC ground in SMPS

I have seen in many SMPS there is a Y cap placed between AC ground and DC ground. What is the need of this Y cap?
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0answers
46 views

Is it possible to replace 6502SGX IC with another IC? [on hold]

I have a workstation HP Z820 and its power supply is not turning on. When inspected, an IC was found "dead" model number "CM6502SGX." It is a 14 pin SMD IC. I cannot find that IC anywhere to buy ...
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1answer
48 views

Power Supply Prematurely Off

I have a Gateway HP-AN235D43 power supply that is 12 V and supposed to output up to 19.6 A. I want to use it to power two 55 W car headlight bulbs, adding up to about 10 A. However, it works only with ...
3
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2answers
96 views

Buck Converter dies unpredictably upon connecting power

I made a PCB for an ESP32-based solenoid controller that is powered by a 24V DC Jack. I'm using an AP63205 Buck Converter to step that input down to 5V DC, and then a linear 3V3 LDO to power the ESP32....
4
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2answers
75 views

STM32F power supply sequencing with 5-volt tolerant pins

The STM32F427 is powered by 3.3V but many of it's pins are 5V tolerant. This allows external chips to drive it's logic I/O pins at 5V without damaging the device. I have a board design with at ...
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3answers
159 views

Three Different Voltage Lines, Same Common Ground?

I am trying to send PWM, clock, latch and blank signals from Arduino through a series (16) of TLC5940 Breakout boards and on to a grid of 512 individual controlled LEDs six feet away (RJ45). I am ...
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1answer
26 views

How to interpret a negative primary leakage inductance in a three winding transformer?

i would like to compare the leakage inductance on the primary side of different transformer geometries. I simulated a three winding transformer with an UI Core. On one leg i have the splitted primary ...
0
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2answers
44 views

Can this receptacle power this power supply? [on hold]

My car has a wall-style AC receptacle in it. It is merely marked 110V 150W. It is not mentioned in the owner’s manual. I’m curious if it can safely power this laptop power supply:
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35 views

China single and 3 phase

What are the differences in number of conductors between single phase and the 3 phase used in China as compared with what is used in the U.S.A.? It's my understanding that 220v residential is strictly ...
2
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2answers
148 views

What is the best way to limit voltage of a solar panel?

I am using a 6V 6W solar panel with the Particle Boron microcontroller with a battery pack. I want to ensure that the voltage supplied by the solar panel does not surpass 6.2V, as that is the max ...
0
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1answer
36 views

How to select components for crowbar circuit?

I need to make a protection circuit for over voltages (protect from more than 5V, protect from 6V to 30V) and current(protect from more than 5A) Could you please suggest components for following ...
0
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1answer
20 views

noise/rpm/cpm values of 12V fan on 5V voltage

I am using Sunon HA40101V4-1000U-A99. This is 12V DC fan, but I am using it with 5V DC (according to specification). But I am not able to find values for audible noise, rpm, cpm, current on 5V. ...
0
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1answer
35 views

Powering 3 DC motors (with limit switches) with AC-DC adapter

I have 3 DC motors: each motor is being used to drive an independent system of pulleys. This system of pulleys spins a threaded bar in order to raise/lower a shelf in a linear motion. Thus, I have a ...
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0answers
50 views

amplifier power wire gets super hot at battery conection when the car is running [on hold]

the problem is that i have a car sub woofer amplifier and when i turn the car on and turn on my audio system and start to raise the volume the power wire (4 gauge) starts to get hot where it conects ...
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0answers
48 views

Charger compatible with device [on hold]

Is this charger compatible with this device?
26
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1answer
21k views

What to do with third contact in DC barrel plug with only two input contacts

My AC-DC adapter gives output of 12V and GND. I tried to search for suitable DC barrel plugs and found that most of them have three terminals So, pin 1 is positive in my case. 1. Which pin should I ...
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0answers
66 views

A multi rail dc to dc power supply circuit design; thoughts and recommendations

I am trying to design or put together a multi rail dc to dc power supply circuit using Texas Instrument webench power supply. My input for this power supply will be 12V and I will have 5 hot ...
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0answers
36 views

Solar Simulator White LEDs flickering

I'm making a solar simulator with 13 white LEDs in series, they operate in 20V/450mA in full brightness (YUJI VTC Series LEDs 135L). As a power supply I'm connecting 220V mains to a Variac ...
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0answers
28 views

Rechargeable LiPo for Raspberry Pi without having to be unplugged to be charged

I tried researching this online but failed to find exactly what I'm looking for. I want to have a docking station for my Raspberry pi, where I just connect it to a micro-usb and it'll recharge the ...
8
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3answers
737 views

What is the purpose/function of this power inductor in parallel?

The inductor in question is part L3, a power inductor with both coils in parallel. Datasheet. The complete circuit is the power supply for an RFID reader, where +5V_A is the output for the antenna ...
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0answers
32 views

Current mode boost converter design

I was trying to design a current mode boost converter in CCM using a MCP1630 and the specifications of the design are as follow: ...
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2answers
63 views

Diagram shows four wires coming from my two wire power supply, what am I missing?

Completely new to electronics and I’m trying to follow a blog post to wire up a linear actuator to a dpdt relay and photocell. I’m stuck, because the diagram I’m following is showing a total of 4 ...
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0answers
65 views

RCA VCR Fuse Question [duplicate]

I have an old RCA VCR (model number VR501) which contains a fuse in the power supply I am repairing. From the markings on the fuse I can only tell that it is a 1.6A 250VAC glass 5x20mm fuse, however I ...
2
votes
1answer
114 views

Cuk converter implementation

I have come across this article: https://www.powerelectronics.com/power-management/step-down-dc-dc-converter-eliminates-ferrite-cores-50khz-enabling-power-supply-chip That describes the Cuk DC/DC ...
4
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1answer
68 views

Amtel ATtiny EEPROM partially erased on power cycle

I have a Digistump with an Amtel ATtiny85 MCU. I can flash the MCU's EEPROM with an ISP programmer no problem. The chip works fine, the bootloader runs and the user program executes correctly. ...
2
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1answer
148 views

Designing an efficient PSU

I am designing a PSU capable of producing 5 watts @ 5V 1A. The design will power about 12 RGB LEDs (totaling about 400mA @ 5V) and a audio class D 1.4 W amp. Space is no issue but efficiency and cost ...
0
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2answers
139 views

3 Phase Input Power

I have a 3 phase switching power supply that I am trying to calculate the maximum input power. It is hooked up to a 3-phase, 277/480 VAC power source. The sticker on the power supply says: "INPUT : ...
2
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5answers
145 views

How can I describe and explain SMPS on a very basic level without diving down in heavy maths / EE lingo?

I'm writing a book about repairing electronics. The audience level for the book is "very little knowledge about electronics" and it's mostly about the mindset and mindtools for finding problem sources ...
0
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1answer
941 views

nodeMCU power via battery + battery charger + booster

I need to power a nodeMCU (as far as I know it can work with 3v3 but I use some I2C modules that need 5V so .. let's power everything with 5V) I have a Li-ion battery (3.7V) I have a TP5046 based ...
0
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2answers
93 views

Is this Bad Capacitor repairable on this power supply?

A capacitor blew on my B-Tron 16-8-1 power supply. When I removed the cover and unseated and reseated the fuse. The power supply began to function again. BUT the power it was giving to each channel ...
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0answers
17 views

Is it OK to draw different current from L1 and L2 on NEMA 14-50? [migrated]

What the subject says. I want to power a rack of commodity servers with 110v power supplies from single NEMA 14-50 outlet. I plan to distribute servers between L1 and L2 such that even at full tilt ...
0
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0answers
54 views

Relays drawing too much current?

I have a problem with my circuit. It's an audio mixer with a PFL module - i've decided to send pre-fade signals via relays. The transformer in +/- power supply is rated 400 mA for each rail. There ...
0
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1answer
109 views

Power supply and PWM for brushed 24V DC motor

I've got a 24V motor with these characteristics: -voltage: 24VDC - rated speed 2750rpm - Output: 200w Rated current: 10.9A I want to use it for a watchmater lathe, so I need to control the speed, ...
0
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2answers
140 views

Maximum voltage and current input of this circuit?

I am looking to assemble a power supply with an output of roughly 600 watts. One of the components required for such an apparatus is a 40 kVDC, 20 mA flyback transformer that I managed to find and ...
0
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1answer
579 views

How do reduce power supply ripple?

I was given this power supply circuit, please see the image. The problem I'm having is when I connect the 10ohm load (solenoid valve), there is a large ripple when I scope the output. I have provided ...
0
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2answers
65 views

What DC Power Supply Do I Need To Get For This Device?

I recently bought a small 3 to 1 HDMI Amplifier Switcher. It can work without power adapter only if the 3 HDMI inputs are connected and supplying current. I want to operate it with only 2 input which ...
0
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1answer
58 views

10 Amp Current Limit

I have a 28VDC, high current supply (constant voltage) that is required to charge an emergency power supply. These EPS internals are rated at 15 amps max input current, however, it’s stipulated that ...
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2answers
6k views

How many amps does a 18v cordless drill draw? [closed]

I have bought an old 18v black and decker cordless drill but with broken batteries, for that, I want to buy a boost converter to convert 12v (max 20A ) from a computer power supply to 18v and use this ...
1
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5answers
870 views

Can I connect +5V GND in reverse to get -5V? Why not?

Since voltage is relative, if I have a +5V regulated source in my circuit board and need -5V some where, what will happen if I just connected the +5V supply connections in reverse? Note that the +5V ...
3
votes
3answers
2k views

Power Supply Design

I just let the smoke out of my testing setup. I designed and built a simple power supply using this guide. I built a capacitive power supply with a bridge rectifier and a final 3.3VDC voltage ...
3
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5answers
567 views

Getting ~600W of power to 2048 LEDs

Despite my Computer Systems Engineering degree, I haven't played with electronics for over a decade, and I'd like to get back into it. I have a project idea, and I think I've got all the design leg ...
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3answers
115 views

Can we connect Earth , Neutral and Digital Ground together in electronics system?

In our project has Digital Ground , Earth and Neutral. As per the requirement Digital Ground and Earth ground tied through Bead inductor. Is it advisable to connect Neutral with Chassis and Digital ...
0
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1answer
494 views

changing 12v halogen lighting to 12v LED

i have an old project that is causing the client current problems. installed was 12v halogen lighting 10w bulbs,G4 base, multiple lights, buried cabling, multiple transformers from 120v to 12v. client ...
1
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1answer
1k views

Arduino controlled bench power supply

I'm looking for a schematic to control LM317 and LM337 from Arduino via digital Pots MCP42010. I'd like to build this schematic (input dual 30V, 500mA transformer per coil) However, with digital pots ...
3
votes
4answers
658 views

Power supply problems

I am building a +/- 45V power supply to drive a master-slave amplifier for a sonoluminescence experiment. I am following a stock design, and am having massive sag problems. The circuit powers up ...
1
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1answer
86 views

Ringing issue on I2C FM+ bus between MCU and few sensors - Power supply issue?

I'm experiencing some issues while probing a problematic I2C bus on the oscilloscope. We want to interface several TLV493D-A1B6, with a STM32L4 (we are working as well on STM32F4 and have the same ...
0
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1answer
85 views

Preventing op-amp output fluctuation at power-off event

What methods exist to place the outputs of an op-amp in a fixed state when power is removed? I have a circuit that uses an LM324 to process an analog input signal. As shown below, the input signal ...