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

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4
votes
2answers
372 views

Are typical computer power supply units leading or lagging power?

Computer power supplies often have "power factor correction" features which raise the power factor in use to levels close to resistive loads (1). I'm curious what, in the absence of power factor ...
0
votes
0answers
32 views

Joule heating in an insulated pipe

What could be causing these seemly adequate power supplies to fail to supply enough current? Background I'm running into a problem while trying to duplicate a research instrument my predecessor ...
1
vote
1answer
43 views

lt1076 buck boost converter outputting voltage that is too low

I am using this buck boost converter from the lt1706 datasheet: It should take 10 to 40V and output 5V and 2A. But when I proto boarded it it only outputs 2.2V and I really need the 5. I am giving ...
1
vote
1answer
52 views

How to emulate a switch on power line

I have a circuit with two DC power lines coming from BAT1 (1A) & BAT2 (2A) (two outputs of a power bank). There is a sliding switch on the power line of BAT1. I would like to keep only one switch ...
-2
votes
0answers
39 views

PSU button broken, do I risk something? [on hold]

I have a question. Usually when I go to sleep I shut down the PC and turn off the PSU and plug the cable from the wall. Recently I noticed that when I plugged in the cable in the wall, the motherboard ...
0
votes
1answer
26 views

Auto fallback power source when one source going down [on hold]

I have a wireless router with simple NAS function, powered by a 5V wall adaptor. It's running 24x7 (nonstop). Unfortunately, the power source in my home is not always available. At least one hour per ...
-1
votes
2answers
529 views

How to get 3.3V from 2 AA batteries?

I would like to know if its possible to 'step up' the voltage from two AA batteries (3V for Alkaline and 2.4V for NiMH) to a stable 3.3V ? I need to find a good power source for a circuit that I'm ...
0
votes
1answer
40 views

What does “Exclusive of Load” mean?

Short Version: Does "30mA exclusive of load" mean the minimum draw while idling, or avg. draw? Long Version: While designing a circuit to interface with a radar sensor similar to this, I've noticed ...
0
votes
2answers
44 views

Combining a benchtop power supplies

So I made an error when purchasing a power supply that was far below desired voltage (dc). The power supply I bought certainly produced enough current, however, and I am wondering if it is possible to ...
0
votes
1answer
34 views

PSU with dc stepdown buck

I want to connect different LEDs that have these parameters (the LEDs I am using are just generic LEDs I got from ebay.): Led 1: 6.4V - 7.2V @ 0.7A Led 2: 2.9V - 5.6V @ 1.9A Led 3: 8V - 12V @ 3.4A ...
0
votes
1answer
46 views

High Power LED and relay with the same power supply

I'm rebuilding optical printer (the machine which does Super8 to 16mm film blow-up) and designed new electrical circuit for it so I can control it with Arduino (or maybe later with Raspberry Pi). ...
1
vote
2answers
53 views

Connecting multiple devices which work on DC to a single adapter

I have 8 biometric devices which run on 12V 2 amps power supply. I have only one AC power source. Usually these devices are connected through individual power adapters. Now I cannot connect more ...
0
votes
0answers
33 views

Circuit diagram for a variable frequency magnetic pulser

This question is following on from my previous question. I'm attempting to build a small PIC-controlled magnetic pulse device. The device is similar to this patent mentioned in this similar ...
2
votes
1answer
42 views

Better to regulate voltage by supplying or subtracting base current to BJT pass transistor?

As a learning exercise, I'm designing new guts for one of my venerable HP 721A (circa 1959) DC bench power supplies. With help from members of this site I was able to vastly improve the reference ...
0
votes
2answers
67 views

What is the deal with input voltage?

Let me tell you right off the bat that I am new to electronics, more specifically the creating of electronics. I recently discovered a project that I would like to make, a pocket power supply(link at ...
1
vote
1answer
73 views

CAM 5 LASER CUTTER : needing to change the laser tube [on hold]

My boss and I discovered that one of the laser tube needs to be changed, and when we figured which one needed it, I told him not to touch the red wire, that there may still be power in it. Well he ...
1
vote
1answer
31 views

How can you add custom supply symbols in Eagle?

I have multiple 3.3V 5V, 5.2V, 4.8V, and 13V supplies. I tried copying a device from the supply library to mine and renaming the symbol and device, but when connecting it still refers to it as the ...
0
votes
1answer
46 views

Current saturation

I have bought a bunch of 24v LED for the garden, during the first months all of them worked fine, but some after they burned out the power supply. The reason is because they were demanding high ...
-3
votes
0answers
41 views

Need help picking up low cost efficient power supply IC/PCB mount for microcontroller project [closed]

I am new to this field and after researching I found the requirements I am looking for. Now I am looking for solution with following requirements. Input 120-240 AC (universal) Output min-200mA, ...
5
votes
3answers
431 views

Is it OK to inject voltage to an unpowered LDO output?

I'm designing for the first time a PCB that can be powered from an external +12V supply or from the USB connector. In the input of the board, just after the power connector (VINLDO net is the +12V ...
-6
votes
1answer
33 views

Power Supply. DC to DC inverter [closed]

I need a schematic of a circuit to convert low voltage DC with high current to 12-13 V DC, here is the source: Voltage = 0.2V DC, current = 1000A, Please advise, Regards, Thomas
1
vote
1answer
45 views

required power supply for nichrome heating element?

I am very new to electrical power math. So please be friendly. :-) I am getting 28 gauge nichrome wire to make my own heating element. Here are the specs and numbers of what I am attempting to do ...
2
votes
0answers
27 views

5V-5V isolated and load regulated power supply

Hi all Requirement: 5V-5V isoltaed and load regulated power supply, load current-0-500mA I am getting 5V output at no load, but when load increases output voltage decrease rapidly and at 500 mA ...
0
votes
1answer
74 views

MOSFET Power Switch

I'm making an external power supply but I want the device being powered to have a power switch on it that turns the external power on and off. What do you think about the following circuit? The ...
1
vote
1answer
49 views

High Current Split Supply

I am looking for a way to construct a 1 A, ±15 V split-supply. So far, I've seen a number of designs for split-supplies (http://tangentsoft.net/elec/vgrounds.html), but they are all low current (i.e. ...
-4
votes
0answers
34 views

IGBT Gate Driver using UC 1845 [closed]

I am using UC1845 Texas Make in a gate driver circuit. I thought of reducing the cost of circuit by using UC2845 PWM converter IC of On Semi Make. The circuit is not functioning and draws high ...
2
votes
1answer
42 views

How do you protect a Li-ion / Li-polymer battery from over-dishcharge?

I'm setting up a power regulation system for a lithium polymer battery, but I'm aware that my LDO will continue to draw current from the battery even after it's fallen below an acceptable level of ...
0
votes
0answers
36 views

Can I use a 100-240V AC 5A Time Delay Relay to spread out startup of drives?

My storage enclosure has dual power supplies for failover. Specs for each PSU:100-240VAC 5AMax continuous output power: 250WTotal power on +3.4V & 5.V is 128W mx I need to delay initialization on ...
0
votes
0answers
89 views

How do I prevent a bulb from dimming?

I am powering a 4W bulb from a 12v lithium-ion 9.8Ah battery. My problem is the bulb dims after a couple of hours. Is there a component I could introduce to the circuit that would keep the bulb ...
0
votes
2answers
93 views

Power Suppy for Modem Router from 12V Car battery [closed]

How i can operate my modem router (KW58283 300M 11N ADSL2+ Modem Router) on 12V car battery. The Modm router is rated as 12V ,1A. I have this battery. The complete router information are here: ...
0
votes
1answer
63 views

How to wire many bi-color LEDs to a single power supply, and switch them on/off individually

My goal is to have 13 separate stations, each with a bi-color, common cathode LED (Dialight 606). These LEDs do not require external current limiting resistors. Each LED can be 'On Green', 'On Red', ...
3
votes
2answers
539 views

Will the lower frequency of 50Hz AC affect overall charging time? [closed]

I'm using a voltage converter to go from 220V to 110V to charge a small appliance. The recommended charging time is 6-8 hours. However, this is specified for US AC voltage 110V@60Hz, whereas the ...
0
votes
1answer
41 views

step down switching frequency

If I have a power supply that outputs 32V,7A and I need to power an LED that requires 24V-2.8A, can i use this step-down module to power up the LED? ...
0
votes
0answers
66 views

ATX power supply only 0.1A from 12V rail?

I have a project which requires a high current output (potentially 60A). Rather than get a lab bench supply, I got hold of a Corsair ATX AX1200i that can supply a max of 100.4A on the 12V wire. I've ...
1
vote
2answers
225 views

Small form factor over voltage protection circuit for 5V power supply

I would like to add small form factor OVP (Over voltage protection) circuit after my power JACK. Could you please any one help me on this, because we have similar kind of 2 adapters one is 5V and ...
0
votes
0answers
21 views

Modifications to Neon Sign Transformer to turn it into a variable DC power supply?

I would like to turn a neon sign transform into a DC power supply. Looking into this it would appear I need some rectifiers to turn the AC output into DC. I could use a variable resistor to adjust ...
0
votes
1answer
49 views

switching power redundancy

I have a load (LEDs) that draws 36V, 5A. The circuit is made in this way: Power Supply (AC-DC) -> LED Drivers (5 in parallel) -> LEDs (5 strips). What component I need to install if I want to add ...
0
votes
1answer
108 views

How to generate highest voltage possible without sparking?

I need to precisely control high voltage in order to maximize the corona discharge zone while preventing arcing for a physics apparatus. The actual voltage when the corona breaks down will vary ...
0
votes
0answers
21 views

What is the critical point of saturation of distributed power on the power system?

With the benefits of distributed power/generation widely known, it is also known for the disadvantages of it two-way power flows considering typical distribution systems are only designed for one way. ...
-1
votes
0answers
28 views

Computer power supply fault [migrated]

This is my first post to the site; it's been a great resource to me in both my professional and personal lives. It's about time I registered! So I went to boot up my desktop this morning and nothing ...
-1
votes
0answers
49 views

Would this power supply work for this config?

I have looked around on the forum but could not find an answer specific to this issue. I have 8 parallel LED strips, each works at 30-33V and requires a constant current of 0.7A. I have a power ...
0
votes
1answer
39 views

Power Supply for 555 Timer LED Fade In/Out

I am a complete electronics newbro. I am looking at building a small circuit for a couple of home made modelling projects. I am following ...
0
votes
1answer
51 views

Power inductor maximum DC current rating

I am selecting a power inductor for my power supply. The only significant source of current draw is a servo motor that draws about 200mA - 1A for 500 ms for less than 10 times a day. Consider the ...
0
votes
1answer
34 views

TSP65070 and OMAP 1V8 pull up to 2.7V

I want to use the TPS65070, the power solution for DSP to power the OMAP L138, but i read in the errata sheet of the OMAP L138 OMAP L138 Errata page 25 that the 1V8 power supply can pull up to 2.7V ...
0
votes
1answer
60 views

Connecting two PSU's in series

Good day, I found this question asked before (not exactly this) but the answers were wrong (at least at some level). So i have two 300W PSU's (different manufacturer so different schematics too). I ...
0
votes
1answer
49 views

Portable headphone amplifier - max output and power supply [closed]

According to the specs listed on this page, that portable headphone amp can produce different maximum voltage, depending on the impedance of headphones: Max Output @ 600Ω 4.146 VRMS Max ...
2
votes
3answers
105 views

Phone travel charger for powering circuits dangers

I am thinking of using a phone travel charger to power a circuit.Ratings: input:110-240VAC(my outlet has 220volts) 50/60Hz 0,3A output:DC 5,2volts at 400mA The problem is that 220 V are of course ...
1
vote
3answers
61 views

CAN Reference Output Voltage

I'm designing a CAN-based platform using the Microchip MCP2551 transmitter. The circuit looks like that: Notice the unconnected pin VREF. I tested the circuit on a prototype and CAN is working. What ...
0
votes
3answers
89 views

How does EMI affect a circuit? [closed]

I was designing pcbs and my head engineer told me that if input supply is large then there should be a separate layer for ground and positive supply as this will reduce EMI effects on the nearby ...
0
votes
1answer
61 views

Power supply automatically disables before the fan has time to reach the minimum current

I bought a power supply, which provides 5, 12 and 24V. The issue is that it has a disable if there is not a minimum current on the output after a certain amount of time. After testing with a resistor, ...