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

learn more… | top users | synonyms (2)

1
vote
1answer
24 views

What is a full rectangular output characteristic for a power supply?

From what I understand, a rectangular output characteristic of a power supply refers to the fact that the maximum power is achieved when Vmax and Imax occur simultaneously. Kepco has a power supply ...
1
vote
0answers
11 views

Enable connected to unpowered regulator on another board

I have an ARM board which uses a VIO of 1.8V and requires that no i/o line be driven before it is fully powered up. It signals this readiness by asserting its "SYSEN" line. My design has SYSEN from ...
0
votes
2answers
39 views

How does single supply transimpedance opamp circuit works

Was going through this webpage and noticed that a trans-impedance amplifier using single supply. However, I am unable to understand how it would work? How would the opamp see inverting ...
0
votes
3answers
83 views

How to automatically switch to backup power? [on hold]

To solve the frequent power outages that happen where I live I ended up using a spare car battery I had and a power inverter (one of these). With that I have more that an hour of backup power so it's ...
3
votes
2answers
353 views

Is it safe to implement a split power supply from two identical AC/DC adapters? [duplicate]

If I have two identical AC/DC adapters(Such as laptop adapters) can I achieve this as in the following illustration? Would it be safe?:
1
vote
1answer
100 views

Is there an IC to make a split power supply from a single power supply? [duplicate]

I'm trying to find the easy but a somewhat stable way to create a split power rails Vcc Vee for the opAmp applications. Any specific known IC for this purpose?
0
votes
0answers
26 views

separate power supplies risks, is there a difference between USB and SATA?

I would like to confirm that, if you have external powered USB and SATA devices that there is a difference regarding risks to connect them to a computer. As I understand it, in the case of USB, ...
0
votes
1answer
28 views

Supply voltage of LM741 with Virtual Ground

I'm looking for a way to feed LM741 with a battery. I found this example that uses the TLE2425 to create a virtual ground of 2.5V (in the original example was used opamp TLC272): I simulated this ...
1
vote
1answer
139 views

Use indepenent power sources for Arduino and for breadboard

I am building a breadboard circuit to be controlled by Arduino. The circuit consists of about 20 bright leds simulating a vehicular lighting system (ten leds for headlight, 4 in taillight, 3 for each ...
1
vote
0answers
70 views

Old power supply regulation board will not trim to spec

I have an old voltage controlled synthesizer that relies on accurate power supply voltages (+/-) for everything to run in tune and so it can interface to other similar instruments. Yesterday I opened ...
0
votes
1answer
33 views

How do I calculate the duty cycle range for DC-DC buck converter?

Question: A buck converter supplies power to a microprocessor with a core voltage of 1.2 V and peak power requirement of 2A. The supply for this buck converter is a lithium battery with a nominal ...
1
vote
1answer
56 views

Power supply turning off when a motor is stopped then quickly turned back on?

When I stop my 12V wiper motor, then turn it back on within a second or so, my 12V 5A cheap power supply turns off for less than a second, and comes back on, then turning on the motor. What causes ...
2
votes
1answer
77 views

power supply oscillates when loaded with instrumentation amp

I've been working on an instrumentation amplifier for a PWL ECG signal in LTSPICE. It should be able to filter out the common mode noise. I Also need to design a power supply. Both the power supply ...
0
votes
1answer
51 views

LM7915 delivering more than -15v

I'm trying to build a regulated power adapter using LM7915. Before everything, I built on a protoboard the schema included on the datasheet (from ST). But, instead -15v, the output is -19v... I'm ...
1
vote
1answer
55 views

Voltage step up for bidirectional current source

I will be using a circuit similar to the following to create a bidirectional current source driving a max load resistance of 10k at a max of 2.5 mA. (based on this article ...
2
votes
1answer
43 views

Directly Power STM32 from Lithium Battery

I'm putting together a wireless sensor node and it's running a STM32L051 which can run at a 1.65-3.6v range. I've also got an RFM69HW radio onboard which can run at 1.8-3.6 (2.4-3.6 for full power ...
0
votes
1answer
49 views

Making dual power supply from single for opamp?

For the circuit of opamp 741. we have to supply the dual power for it. How can I make a dual power supply from single. For example, make a (+9V)-GND-(-9V) from single 9V battery ?
1
vote
1answer
56 views

Questions about circuit diagram, Lipo charger

Circuit diagram from here I've asked couple of questions about PS and Chargers, I keep facing new issues using the diagram above "an automatic lipo charger, sort of",why would the zener diode ...
-4
votes
0answers
22 views

Power Usage of a GPR System? [on hold]

I am currently trying to design a charging system for an RC vehicle with a mounted GPR (Ground Penetrating Radar) system. I've tried researching, but I haven't been able to find any numbers on the ...
0
votes
1answer
38 views

Exiting Virtual Ground back to Zero Volts Reference

I have a circuit using LM358N and LTC6240 op amps. The supply is 0-5V and I have used a virtual ground circuit, where 2.5V is my reference. I am happy with my filtered and amplified signal and now ...
-2
votes
1answer
53 views

What determines the amount of power sent to a device?

I have various devices that draw amount different amounts of power from a micro power connector. If I have a 240V socket plugged into a device which draws 4W of power, does this mean that the power ...
-1
votes
1answer
70 views

Trying unsuccessfully to heat a 12 V 1 A jacket with an 18 V battery and 5 ohm potentiometer

I"ve an electrical jacket that takes a 12 volt craftsman rechargeable battery. If I hook it up to my power supply and set at 12 volts it works and draws 0.6 amps. I am trying to get it to work with ...
0
votes
1answer
41 views

Maintaining DC voltage with more batteries

I have a circuit which i am powering with two 1.5V AA batteries that dies at 2.6V volt as the battery discharges. Reading around, i realized that even though there is energy in the batteries, my ...
2
votes
1answer
91 views

current limiter / short circuit indicator for a variable power supply

I am building a variable power supply circuit and I am wanting to add a current limiter or a short circuit protector to its output. I feature that I'm attempting to add to the protector is an ...
0
votes
0answers
33 views

recommendations for powering 11mw laser [closed]

A friend recently gave me a helium neon laser which he knew very little about. The laser is 10 milliwatts class IIIb laser. How much voltage do these usually require? What power supply is recommended? ...
1
vote
1answer
56 views

Efficient power supply from batteries

I am still new to electronics and I am looking for a low noise and efficient way to provide 5V and 3.3V from AA batteries. My circuit requires 3.3V/200mA 10% of the time and less than 1mA the other ...
1
vote
2answers
60 views

How to calculate heat dissipation improvement when adding a fan to the heat sink?

I'm using an LM338 which I want to supply at least 3A @ 20V, with Vin being 35V. I made my calculations and I figured out I'd need a very expensive (for my budget) heat sink so I'm looking for a more ...
-3
votes
2answers
56 views

What is the best way to power a wearable device such as flexible oled screens? [closed]

What is the best way to power a wearable device such as flexible oled screens? Possibly a way that wouldnt alter the size of the wearable?
0
votes
1answer
46 views

Looking for advice on new led project

This is my first post, and I'm very new to the Hardware side of Making but I'm working on an led project and I need some advice. I want to use individually addressable leds, but my project is pretty ...
-1
votes
2answers
67 views

Under what conditions will the following circuit work?

The following circuit that only has a single supply wire and not grounded (see below). Under what condition can this circuit be made to work (supply a small amount of rectified current, say 5mA). In ...
2
votes
1answer
154 views
+50

Raise input for a voltage monitor IC

I was looking over LTC2990, which is a voltage, current and temperature monitor. It is perfect for my project as I'm newbie. I want to build a power supply which will show on a display the voltage, ...
0
votes
1answer
134 views

AC/DC wall adaptor as LTSpice Analog behavior model (ABM)

Suppose a circuit shuld be supplied ( in real life ) from a wall mount AC/DC adaptor. The adaptor has a nominal voltage of 12VDC 500mA. With no load the adapter puts out 21.6V. After some measurement ...
0
votes
1answer
34 views

Power a multimeter from a 9V adaptor [closed]

my new UNI-T multimeter just arrived but unfortunately i dont have a 9V battery to power it, however im having a 9V wall adaptror which im using as a power supply for my arduino (with a 5V regulator). ...
0
votes
1answer
60 views

Can a power surge pass through a household DC power adapter?

I assume that all DC adaptors for household electronics use a bridge rectifier, and that therefore any voltage spike would readily pass through them. Is this correct, or is there any way that ...
0
votes
1answer
41 views

Using a diode to lower supply voltage to nrf24l01+?

I was wondering if I could use a IN40007 diode (or Zener diode) instead of a 3.3V voltage regulator. I plan to power the module using a 3.7V LiPo. Since the battery would be 4.2V when fully charged, ...
0
votes
1answer
27 views

Computing Power Requirement For Solar Setup

In relation to this question: Solar power wattage requirement I'm trying to get to the math of understanding my wattage for my plan solar-setup. I would like anyone here who knew can correct me on my ...
0
votes
0answers
25 views

Servo Not Moving to Commanded Position

The following servo: https://www.sparkfun.com/products/11884 (4.8V - 6V) is being used in a robot that I've got. While I was running off ofthe 5V output from my arduino, it was fine. The current draw ...
1
vote
2answers
67 views

How to efficiently boost a low voltage high current input to a high voltage low current output

I have a 3.7V 6600 mAh lithium-ion battery that I'd like to use to power some small 6V motors that only require 500 mA. However, I need the battery supply to last as long as possible (which is why I'm ...
-1
votes
0answers
27 views

Can I fully load multiple breakers (rooms) in my apartment? [migrated]

I've got some very high-amperage devices (Bitcoin miners. ugh.) coming into my apartment; and although I'm going to pains to make sure I don't over-load any single room's breaker on the wall sockets … ...
1
vote
1answer
37 views

Intel Atom board (DN2800MT) power supply, can I add battery?

After reading through 20-something posts about 'car/12V/power supply/computer' I've still not found a definitive answer to what I'd like to try here. If this turns out to be a dupe after all, my ...
0
votes
1answer
44 views

AC - DC Power Supply Non Isolated

I have been thinking of using LNK305P from Power Integrations to integrate an AC -DC power supply in my next project. The application note containing the circuit is here. What things do I need to ...
0
votes
2answers
77 views

Power demand beyond maximum deliverable power

simulate this circuit – Schematic created using CircuitLab We got an elementary dc power system as shown in the figure. The maximum transferable power P_max is 0.5W. Is it possible to ...
7
votes
3answers
611 views

How does DCDC save power over an LDO?

I am using a camera module of our custom application. The camera module started consuming more current when compared to a previous board which has all the same settings, chipsets and modules. In our ...
2
votes
2answers
230 views

Cascading voltage regs not working as expected

I was trying to hack together a power supply circuit with bits I had lying around but I didn't get the voltages I thought I would get, this is what I naively thought would happen: But in reality ...
1
vote
3answers
79 views

Converting battery voltage 12 volts to -5,5 volts at about 3 mA

My team and I are trying to power a sensor. We need to get -5.5 volts and were not too familiar with making or acquiring negative voltages. So it doesn't have to be a 12 volt. Ultimately we'd like ...
0
votes
1answer
46 views

DSL Modem Power circuit failure - LEDs are blinking incessantly without powering on

I have a DLink DSL modem at home which started causing trouble recently. The device won't completely power on, but the LEDs blink in short strobe like manner. I thought it was a power switch problem ...
0
votes
1answer
47 views

Trying to power a 100-watt Cree Xpe array as efficiently as possible with dimming

I've recently purchased a 100-watt Cree 30-module XPE multichip ...
-5
votes
0answers
25 views

Transformer equivalent [duplicate]

please I really need a quick answer. I have got a multiple cell-phone project I want to do. according to the project it uses 6v3amp tranfmr but seems i cant find any at hand now. pls can any one ...
0
votes
2answers
74 views

Bench power supply “Issues that rouse during build”

I'm building a power supply, based on this instructable and this one I am using 24volts DC power supply, 7+ amps circuit is based on LM338 / 7805 / 7812 Circuit is working although few things ...
1
vote
1answer
59 views

Replacing a relay by a transistor

i'm new in electronic, I made a simple circuit to control a pump it's working, but i'm really not happy of the result. I have to plug 2 power sources because if I have only one for the pump and the ...