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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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Trying to identify a battery and its controller

Attached are two images of the inside of one of those device batteries to extend use of your phone. This one was a promotional giveaway and only had their logo on the outside. I tried searching for ...
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2answers
60 views

Could a blown voltage regulator still supply electricity?

(I'm new to electrical engineering, both the website and the topic, so don't hesitate to correct me) I'm building a very tiny form factor transformerless power supply with 5 V output. I was ...
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1answer
179 views

How to clean output from a ubec

I'm bit stuck and at the end of my knowledge. I'm building a light stick that is controlled by a teensy micro controller and using programable rgb led's. (ws2812) the led's run at 5volt and need ...
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Convert 240v to 120v for 120V Bulb

I'm having trouble to use my Philips Hue light bulbs, I bought one of their starter kit and later found out that it contained 120v bulbs. Luckily the bridge provided was 120-240v(aka universal). I've ...
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2answers
357 views

How long can equipment go unused before powering up runs the risk of damage?

I have an older solid state radio transceiver I want to power up but I understand that electrolytic capacitors loose their function after a long time of non-use. There are articles about reforming ...
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2answers
67 views

Why the replacement of 7812 with R-78E12-0.5, DC/DC makes the circuit not working?

I have this simple surge protector and soft start inside the PSU. My transformer is out of its specifications yields 21.3V after bridge rectification. And 0.1A load (12V fan for cooling pass ...
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1answer
450 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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29 views

Why Webench power tool suggested using this Hot-Swap Controller (TPS2420) for my design?

I was trying to build dc to dc converter that has one input which is anywhere between 9V-20V and has 4 outputs: 5v @ 2.5A, 3.3V @ 2.5A, 3.3 @ 1.5A, and 1.5V @ 1.5A. So, I sequenced the outputs and ...
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44 views

Power Supply for the Pre-amplifier I bought

I bought this China clone "Marantz-7-M7-Tube-Buffer-Audio-Preamplifier-Pre-AMP-Board-KIT" I thought that it was just simple. I just don't want to throw it away, but what does 220v mean input meant in ...
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31 views

Using 19V, 3.4A power adaptor instead of prescribed 12V,3A power adaptor on an embedded box PC

I have an embedded box PC: Advantech Ark1122H. Instead of the prescribed 12V,3A power adaptor, I accidentally used a 19V,3.4A power adaptor that is supposedly for another embedded box PC. Now this PC ...
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TINA/Spice/UCC3803: Unable to tune analysis parameters for 0.8 V to 4.8 V DC-DC boost converter design simulation

I need to simulate a DC-DC boost converter on TINA-TI. However, I cannot get the convergence necessary to carry out these simulations. I've tried using the parameters utilized in online reference ...
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1answer
38 views

Rectification voltage

I designed this power supply and simulated in Multisim 13.0, and noticed that the output of the full bridge was higher than that of the input to it. Would this have anything to do with the ...
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1answer
116 views

RT6224D-based step down circuit yields 0V - why?

We received a set of prototype boards. They have a DC power supply input feeding into a step-down converter, which is built around an RT6224D. It is supposed to deliver 5.0V. The circuit is almost ...
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1answer
53 views

+/- 96 V transformer less power supply design

I know this is a dangerous practice, but obtaining a transformer to make a vacuum tube power supply in my country is prohibitively expensive. So i have to go for transformer less psu. I am just making ...
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1answer
55 views

I have a 2 A 12 V regulated power supply and I want to use it to emulate a 9 V battery for a breadboard

I have a 2 amp 12 volt regulated power supply and I want to use it to emulate a 9 volt battery for a breadboard. However, I need to protect the power source and the components used in my breadboard ...
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1answer
67 views

Can I use a 22 microfarad capacitor in place of a 10 microfarad capacitor?

I have a bad 10 microfarad capacitor 400V but can not get a replacement. Can I use 22 microfarads 400V instead?
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21 views

Using a single battery for robot motors and electronics

Instead of using two separate 12V SLA batteries (one for motor controllers*, one for Arduino, LEDs, sensors ...), would they work in series as one 24V battery, with a step-down converter for each ...
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3answers
380 views

Supply current of negative rail

I'm using an LTC1983ES6-5 to provide a negative rail for both a MAX4311 and a MAX4395. LTC1983 provides up to 100 mA, but I cannot find in the other datasheets how much current is required for the ...
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1answer
25 views

protection board for 18650, voltage drop? normal?

I made a power pack using 18650 batteries from an old laptop. All batteries tested individually are good. 4 batteries in 2S format. I used a cheap 2S 3Amp rated protection board I got on Ebay from ...
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31 views

SCR reverse current during switch off

In the figure below is shown the dynamic behavior of an SCR in terms of its current during switch off. I'm interested in calculating the maximum reverse current (iR in the plot). The parameters that ...
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1answer
49 views

One time blink then turn off circuit

is it possible to change Circuit Diagram for the following example: http://www.redcircuits.com/Page146.htm or https://www.youtube.com/watch?v=mrxdiO1b29A Original: 4 short flashes stay on light ...
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3answers
46 views

Battery systems for 440v industrial motors

Are there systems utilizing batteries to start large (25hp - 50hp) 440v 3-phase electric motors, thereby eliminating spikes to the supply grid?
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1answer
727 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 ...
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2answers
31 views

Power 9 IR LEDs 850 nm with a forward voltage of 1.7 V and forward current of 100mA

I am looking to power 9 IR LEDs 850 nm with a forward voltage of 1.7 V and current of 100mA. i want to make a circuit where i can use a small power supply or could I use the raspberry pi to power it? ...
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1answer
2k views

Digital voltmeter ammeter wrong reading

Hello! I've built a small adjustable PSU with a buck converter (XL4015 module) and a cheap 10A digital voltmeter and ammeter. It worked fine for a few minutes but after that the voltmeter started ...
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2answers
57 views

Confused on how to wire a Laptop Heatsink/Fan

thank you so much for taking some time out of your day to answer my question. I have bought this Laptop HeatSink/Fan combination and it comes with a molex connector at the end of the wire to attach ...
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1answer
33 views

USB internal control to on/off a pc fan molex circuit

I am new to electronic circuits so I might not have the correct nomenclature for some items. Description: I have 3 high power 12V PC fans (NON PWM) connected to a hub that draw power from MOLEX ...
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3answers
46 views

Peltier wiring diagram

im just an electronic enthusiast #1? Is it posible to power the peltier with a motor speed controler 220vac input and varable output. If no, why? What are the remidies #2? And if i use a 48vdc power ...
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4answers
3k views

“Hot-knife”/Thermal cutter power supply design

I'm undertaking a DIY rope cutter project to avoid paying for the ~$150 store bought ones. Many resources online told me to use a light dimmer + transformer configuration and I had planned to go a ...
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1answer
35 views

Filter power supply for video signals

I'm drawing a board with an MCU (running at 32 MHz), some serials and an analog video section (mux and amplifiers). I kept the video section physically separated from the digital one: i.e. it's placed ...
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1answer
71 views

Switch between 2 power supply feeds without device losing power

I have done a search on here but didn't find the answer (maybe "woods for the trees") but here goes... A brief 'background' -- In my house, there's a switch by my front door that turns on/off the ...
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1answer
53 views

Power multiple parts of one project from one wall wart

I'm building a project with a high-power 10W RGB LED controlled by PWM from a microcontroller. Right now I'm using a wall wart to power the LED, and powering the MCU through my computer's USB. My ...
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3answers
181 views

Full bridge driver capacitor ringing problem

This is my first time designing a full bridge driver. I am experiencing problems with ringing on the output. I have made a pcb for it. This is a picture of the top side of the board. Backside Input ...
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2answers
110 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 : ...
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1answer
85 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, ...
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Power distribution board stops working properly when increasing maximum current limit on DC power supply or when connected to battery with higher Ah

As per my understanding increasing maximum allowable current limit should do nothing to circuit. But a particular optocoupler enabled port of power distribution board stops working. What kind of ...
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3answers
87 views

Possible Error in Microchip Datasheet

I am working on duplicating a product according to the Microchip datasheet. http://ww1.microchip.com/downloads/en/appnotes/00857b.pdf My question has to do with something I found in the schematic (...
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1answer
430 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 ...
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2answers
31 views

Compensating voltage drop in circuit

My brain seems to be stuck on this very basic circuit design question. I want to power a 24VAC load (solenoid valve) with the help of a switch (triac). This switch, however, creates a voltage drop of ...
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1answer
51 views

Power up sequence for AD5724

The datasheet says: POWER-UP SEQUENCE Because the DAC output voltage is controlled by the voltage monitor and control block (see Figure 42), it is important to power the DVCC pin before ...
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12answers
84k views

Is it really OK to supply more current than what the component is rated for?

In this heavily upvoted answer the answerer states that it is okay to supply a component with more current than what it's rated for. The analogy is that (paraphrasing here) "If Johnny wants to eat two ...
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2answers
3k views

Why am I getting electric shock from 12V DC Adapter

May be this is a weird question. But I am little curios to know why my 12V DC adapter is giving shock when the circuit is complete. I purchased couple of these 1 AMP 200V AC to 12V DC adapter. ...
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1answer
205 views

Safety Capacitor Selection

When selecting an X2 safety capacitor what must be taken into consideration. There are only a few types of capacitance ranges and seem to be chosen based on voltage rather than capacitance. Take ...
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0answers
24 views

Single IC for charging and boosting LiPo battery [closed]

I'm designing a power management system for a bio-signal acquisition system (low-noise amplifier, ADC, uC, Bluetooth). I will power the system using a LiPo battery such as this. (3.7V, 500mA, 1050mAh, ...
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0answers
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Fuse getting blown off [closed]

We are using a water purifier which will give hot water, cold water, and ambient water. It's working condition is good, but the problem is the fuse gets blown off every 2 or 3 days. We are replacing ...
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2answers
58 views

12vdc linear power supply enclosures

Is it safe to install a test bench , hobby, linear power supplies with 115vac/12vdc in 3D printed enclosures? The only protection im worried about is electrical shock and whether the transformers put ...
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4answers
15k views

How big current I can commutate using D-sub connectors?

The question Did someone knows what are the current capabilities of the standard D-sub (aka Cannon) connector. I want to use it for power source connection together with the signal. I need pretty ...
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1answer
1k views

Eagle PCB supply symbols in a multi-voltage system

Supply symbols signify vdd and gnd and perhaps vdd, gnd and vss in dual supply system. However, in a situation where one has +5V, -5V, +3.3V, 1.8V, Analogue ground and Digital ground, what should one ...
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3answers
101 views

LM723 based bipolar power supply solution question

Why TL081 and 2N3906 may get very hot? The simulation of the TL081/2N3906 shows the normal working temperature, but I measure +62 ºC