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
2answers
47 views

Low voltage power “distribution” board design

I got a cheap 12 volts power supply (this one specifically) which I want to distribute to several CMOS CCTV cameras (such as this one) which are spread around the house (15m max. distance). Normally ...
0
votes
1answer
35 views

Switching between two power supplies with a P channel Mosfet, Is VGS a problem?

So I am using the following circuit to switch between VIN 0-30v and USBVIN 5v. I thought I found the ideal solution until I realised the FET in the schematic only has a max VGS of 8V. But I don't ...
-1
votes
0answers
16 views

Triple output power supply with sequencing to a sensor - Where to start? [on hold]

I'm looking for a triple output power supply with built-in sequencing. Are there any OTS supplies that are small in size? If not, is my only option building a circuit for it? Any hints on how to do ...
-4
votes
2answers
76 views

Mains powered e-cigarette

I'm kinda stuck in a situation where i have a 18650 Li-ion battery which is enough to power my atomizer throughout the day, but yet I want to be able to use some low-resistance (sub-Ohm) atomizers ...
-1
votes
0answers
25 views

110v rated Receiver to 220v [on hold]

I just bought a Yamaha Hifi receiver in the States and I'm bringing it to my country, where the mains voltage is 220AC. USA based yamaha branded receiver are not multiple voltage cappable, so I have a ...
0
votes
1answer
46 views

Behavior of power supply and DC motor for voltage/current combinations?

Are the below statements correct? Marked in Bold and Italic are my doubts! Unregulated power supply (Battery?) If supply current rating > motor current rating --> No problem since motor pulls only ...
0
votes
0answers
16 views

Reconnecting a tip to the power supply of a Asus eeeBox PC model B202 (12v 3amps) [on hold]

The power supply socket on the Asus eeeBox PC model B202 clamps down the tip of the power supply. The power supply tip is 4.8mm by 1.7mm. The reason the power supply tip is clamped down is because ...
0
votes
1answer
91 views

How to calculate amp for a power supply? [on hold]

I know zilch about electrics. Basically we have a power supply that my cousin has, and for some reason she wants to know what the amp is. The information I'm being given is: INPUT: 230V~AC 50Hz ...
0
votes
2answers
53 views

powering op amp current

I think this might be a bit of a stupid question, but I've got a bit of mental block on it. I'm trying to power a CA3140 op-amp. I have a 12V source, and an AMD660 inverter to provide the negative ...
1
vote
1answer
51 views

How do I calculate Watts for a dual rail power supply?

If I have a 5V power supply powering a circuit which is connected to 0V, to calculate power usage I would take the total current in Amps and multiply by 5V. However, my current circuit uses -12V, ...
-3
votes
0answers
18 views

2 smps adaptor 24VDC 3A on TDA7294

Can i use 2 pcs SMPS 24V 3A adaptor for TDA 7294 as split supply 24V+ and 24V-?If TDA7294 can turn on with this split supply then how much watt i get from this 24VDC +/- 3amp?Please help im ...
0
votes
0answers
32 views

Looking for “Model” of the L200, ideas? [on hold]

Since i want to build a power supply based of the L200 i want to simulate it first using multisim. The problem is that multisim doesn't have the L200 in their database. So I'll have to make one ...
-1
votes
0answers
17 views

Best PWM IC for LED Driver [on hold]

I am confused to choose best PWM IC for my LED bulb Driver (Offline flyback SMPS converter with primary sensing) Specification- Input-90v to 265v AC Output- 150mA constant current, 40V DC Please ...
-3
votes
1answer
60 views

Will using an unregulated power supply with a low current draw give too much voltage? [on hold]

I have a device that needs a (regulated) 12VAC power supply, which turns out to be close to impossible to find. But, I also have an unregulated 12VAC 1A PSU, which reads 14.4V without load. So, since ...
0
votes
2answers
159 views

Can I use 250μF capacitor instead of 100μF?

I am trying to drive a stepper motor from an old DVD drive with the Pololu A4988 driver and an Arduino. The data sheet says I need a 100μF capacitor to prevent voltage spikes when using a 12V PSU (I'm ...
0
votes
2answers
56 views

Power Supply Circuit ±9V from a 6V centre tap transformer

At work, there's a power supply which is used on one of our products. The guy who originally made the board has since left and none of the senior electronics guys could give me a good answer. Here's ...
-2
votes
2answers
41 views

Measure current in power suppy [closed]

I have a power supply which I ordered online for 100 amps. I thought it will be digital but its an old fashioned type. I want to build the current sensing circuit to find out how much current is ...
1
vote
2answers
75 views

Is a capacitive power supply safe?

I'm doing a home automation system which uses a RF transceiver(nRF24L01+) paired with an arduino to control the relays. Since these require low power DC to run I was researching on ac to dc when I ...
0
votes
3answers
67 views

N-Mosfet switch circuit strange behavior laboratory power supply

I'm dealing with an N-Mosfet switch circuit to control, through PWM, the temperature of a heater resistor. The mosfet is a IRFS7430-7PPBF. The load is driven at 12V and has a power rating of 80W. ...
2
votes
2answers
67 views

Isolation of the transformerless power supply

One of the disadvantages of transformerless power supply is the isolation problem because of the absence of the transformer. My question here is : Doesn't the capacitor in series at the input do the ...
4
votes
5answers
777 views

Are there any advantages to either DC barrel connector polarity?

I was putting together a fairly basic LBB at the weekend to control a handful of DC devices which got me thinking. Why are both pin-positive and pin-negative DC barrel connectors used? Are there any ...
2
votes
2answers
128 views

How do I hack my soldering iron?

I bought another soldering iron, very expensive to me. I am very exciting about it. Upon receiving it, My heart is broken. First, I saw the label, 220V; Our AC voltage is 110V. Tried it, doesn't ...
1
vote
1answer
41 views

Warm/hot starting a GSM/GPS module

I am new to electronics and trying to understand how a "warm/hot start" works. I am currently working with someone to design a PCB schematic for the SIM928A, a GSM/GPS module. In the hardware design ...
3
votes
3answers
484 views

Why a neon lamp indicator on power strip switch flickers in the dark?

Neon lamp indicators embedded in power strip switches indicate whether the switch is ON or OFF. When the neon lamp is ON in a dark environment (lights of the room are off) the lamp start to ...
0
votes
1answer
53 views

What's the name of this connector?

I cannot find the name of those power/charger connectors they have on the electric scooters and "hoverboards". It seems to be some 3-pin XLR-like plug. Can anyone help?
1
vote
0answers
68 views

Need help repairing adjustable DC power supply stuck on 48V

I have a cheap benchtop dual-output adjustable DC power supply. One of the outputs is working alright, the other one "burned out" when it was left loaded somewhere near 80% of its maximum for 24 ...
0
votes
3answers
80 views

Is power rating of transformer determined by input or load?

Scenario: I have current carrying conductor with a current transformer around it. If the load is rated at 5V, 2A and only requires 2W of power, but the primary side conductor is carrying 100V 12A. ...
0
votes
4answers
70 views

Difference between a 'DC DC Switching Regulator' and a 'Linear Regulator'?

What's the difference between a DC DC Switching Regulator, and a Linear Regulator. I'm buying one to make a variable power supply (is this the best way to do it?) and I need to just output an ...
-3
votes
2answers
60 views

Why do RI=RL equal in maximum power transfer theorm?

I know mathematical proof I need explanation. Why this happen.That doesn't make any sense to me.I know that in series connection current (I)is same.But here  current flow is changing with different ...
1
vote
1answer
47 views

2 Layer power routing with mixed signals

I am working on a BLE Gamepad project using a module based on the Nordic NRF51822. This is the first project I have done that is more complicated then an arduino project so I am likely to make some ...
0
votes
0answers
15 views

What's the peak voltage of the sawtooth generated by the ic SG3525 or UC3525? Does it depend on the Ct capacitor?

P.S. I need this information in order to make a closed-loop FlyBack CC-CC converter. The Tm transfer function is related to the sawtooth peak voltage: Thanks!
0
votes
1answer
31 views

Low weight split core transformer on 11kVA transmission line

I've seen transmission line energy harvester's that utilise a split core transformer. Here is an example. However, I fail to see how this is possible when a transformer cores which are small enough ...
0
votes
0answers
25 views

Decreasing Voltage of Power Supply Laptop Charger to Solve Another Issue: RIght or Wrong?

I have recently bought a laptop universal charger, and as soon as I plugged it in, the mousepad of the laptop started lagging. The Power Supply Charger is registered as 70W. The laptop requires 65W. ...
1
vote
1answer
71 views

How come SMPS regulators doesn't show current limiting circuit?

for example the LM2678-ADJ is a famous buck converter, there are also many others. I have googled and looked through other regulators, there are many schematics in the datasheets of how you make the ...
0
votes
2answers
40 views

Adding an on/off switch to an USB charger [closed]

I was wondering if it is possible to wire an on/off switch into the cable of a wall-wart USB power charger as easily as it is to wire an on/off switch into a regular power cable? Or are there ...
-3
votes
0answers
43 views

dc power isolation techniques

I need a circuit or a technique for DC power isolation. What i want to do is below; How can i do DC isolation between power and load? Can anyone suggest me several methods?
-3
votes
2answers
76 views

Can a SMPS LED driver glow 6 Watt LED bulb and same Driver is able to glow 0.5 Watt LED?

LED : 150mA * 3.3v =0.5 Watt 6 Watt LED (0.5 Watt* 12) : Which one is best method to arrange LEDs Parallel or Series. At a time only one LED will glow, Either 6 watt LED or 0.5 Watt LED. ...
1
vote
2answers
75 views

Reduce noise in Buck converter:

I'm making a buck converter, this is the circuit I've: The average voltage at the output is ok, but I'm getting lot of noise at all nodes of the circuit: I'm using as a main source a 30V 5A bench ...
0
votes
1answer
95 views

Help explain how this ac switch circuit works

Below is an ac switch circuit. COIL1_EN is used to enable or disable the switch. Does any one know how this ac switch work? I think it may be a standard design, can anyone give the related ...
0
votes
5answers
124 views

High peak current supply circuit

I need to design a "peak" power current supply circuit for my load. Power specifications of load are below; Continuous power consumption: 12 V 5 Amperes DC. Peak power consumption: 12 V 10 Amperes ...
0
votes
2answers
48 views

A question on power supply for a sensor

There are temperature sensors which are powered the following expensive supply: http://www.prelectronics.com/pdf/2222-2476-US.pdf Here it is mentioned: "The power supply is based on primary switchmode ...
-1
votes
2answers
35 views

Power supply replacement question [duplicate]

I need to replace a power supply on a machine. My current power supply has an input of 120v~60Hz 12VA, can i replace it for one with an input of 120V~60Hz 25W?
0
votes
1answer
62 views

How critical are the input and out capacitor values in a linear voltage regulator?

7805's datasheet recommends a 0.33uf and a 0.1uf capacitor for input and output respectively. For a clean input voltage and a resistive load, I've used this kind of regulators without the ...
0
votes
1answer
31 views

Mimic Power Line

For a class I am making a system to remotely turn on and off a light as well as adjust the brightness through a dimmer(this one: ...
2
votes
4answers
77 views

Does the IR2110 need a gate resistor?

The datasheet of the IR2110 shows this as the typical connection: And in some cases even a gate-source resistor is used, as in this and this post But the app note shows this as the connection ...
0
votes
2answers
57 views

Confusion on dimensioning power supply and fuse for a motor

I have the servo-motor model called MAC140. Here is a long manual including all other types of motors of the same company: http://www.jvl.dk/files/pdf-1/user%20manuals/lb0047gb.pdf If I go to section ...
0
votes
2answers
43 views

Can I use a point-of-load converter for providing USB power?

I'm designing a power supply that I would like to have a USB power output for charging/powering USB devices. In an effort to reduce risk and design time, I'm looking at mounting a DC/DC converter on ...
3
votes
4answers
2k views

Stacking batteries to get 200 volts and 21 amperes

I need to run an old DC motor that needs 200 V DC, 21 A full load; total 4200 W. I want to see if I can run it on V mount lithium batteries made for cameras. Each battery has: A ...
2
votes
0answers
34 views

How to connect capacitors to SIM800C gsm module [duplicate]

I am powering a SIM800C from a 3.7V Li-ion battery. If the battery charge drop below 85% (it still has 4.1V measured without load), the module keeps restarting during startup. This probably happens ...
1
vote
5answers
173 views

DPST switch control 5vDC and 220vAC

I would like to make usb-charging sockets from two sides of the bed, and I don't like the idea of power supply working 24/7 so I decided the following scheme to have power ON while me or my wife are ...