In electronics the term adapter is normally used to describe something that converts from one connector or package to another. For example a BNC to SMA adapter is an example of a connector adapter, while an SOIC to DIP adapter is an example of a package adapter.

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Why do laptops need larger transformers than mobile phones?

I was wondering why a laptop power adapter is so huge. Most laptops that I have seen use a ~19V power supply. Using transformer equation, and considering 100 turns in the primary(just an assumption), ...
0
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1answer
32 views

What AC-to-DC adapter would I need to power two of these battery (3V) powered door contacts at once?

I'm new to electrical wiring. I understand circuits, soldering, and basic wiring in parallel / series but calculating and understanding draw, resistance, etc. is new to me. That being said, I have ...
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0answers
35 views

Testing eMMC host controller on a development board having SD connector

I have xilinx's ZC702 evaluation board. The board has SD connector. I want to test my eMMC host controller. I have found out some SD/eMMC adapter (http://www.kingston.com/en/flash/emmc). This adapter ...
3
votes
2answers
67 views

How can I adapt a 3-pin PC fan connector to a 4-pin connector?

My computer's motherboard uses all four pin fan connectors with no support for speed controlling the older three pin fan connector. The problem is, all the PC fans that I have use a three pin ...
0
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1answer
36 views

Why a high voltage AC always present in SMPS AC to DC power adapters

I'hv seen every 2 pin SMPS AC to DC adapters shows a little high voltage respective to the ground on the out put, on both + and GND wires(or more if more wires present). This voltage is high enough ...
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3answers
64 views

Is the laptop's power adapter output negative terminal grounded?

Today I find my lenovo laptop power adapter's output negative terminal is not grounded (the input ground terminal is not connected with output negative terminal, measured with DMM). But another old ...
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1answer
43 views

input current vs output current

My old/new laptop adapter specs as given below. I understand the output current for new is 4.5A which is OK when compared to old which provides 3.25A load since it can provide more load. However, ...
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1answer
47 views

Powering AtTiny85 with Adafruit NeoPixels

I have an AtTiny85 and a series of 144 5v Adafruit NeoPixels. I'm following something similar to this tutorial: http://shin-ajaran.blogspot.com/2014_04_01_archive.html, but it doesn't mention if the ...
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2answers
128 views

Operating USA Bought Medela Breast Pump in India [closed]

We have a breastpump which we bought in USA. See the pump here The adapter which came with it has following printed on it: ...
2
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1answer
96 views

DC Barrel + Battery schematic

I would like to create a power supply for a learning project, using either a DC adapter or a 9v battery. I've read a few topics here and on the web about barrel connectors, but I'm still not sure how ...
0
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2answers
119 views

Is there a reason why some ac/dc adapters don't have a grounding pin?

I'm searching for an AC/DC adapter of 6v 300mA, but I can't find one with a grounding pin (E-type). Is there a specific reason for this?
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2answers
81 views

why L6565 has input range of 80v-240v? Why not 12v-240v?

L6565 Data sheet specifies that input range starts from 80v to wide range. Why the range does not start from 12v? Is it possible to make it to input from 12v and up?
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1answer
91 views

Is it safe to splice an output extension onto an AC Power Adapter? [closed]

(first post, trying my best to follow the rules :D) I recently bought a Cintiq 27qHD tablet, and an Ergotron arm (with an extra arm segment) to mount it. The intended way to do this is to run the ...
1
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1answer
66 views

Easiest way for USB-C to USB-A adapter design

I'm looking through USB 3.1 specs and can't find any answer about one simple question. I'm designing USB Type C to USB 3.0 Female A adapter, which will require USB 3.0 bandwidth (5Gbps) and standard ...
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1answer
45 views

How to properly compute device need and set of a Universal adapter for powering said device [duplicate]

So, I just blew the fuse in my 17" monitor using a universal adapter with the settings Input: 100-240V 1.5A(1.5A) 50/60hz Output: 15/16/18.5/19.5/20/22/24V (max of 70w) I want a clarification of ...
0
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1answer
47 views

How do adapters work with different number of pin inputs/outputs?

I'm going to be working on something that requires me to use a GPIB to USB adapter, which made me look up the pin diagram for both. The GPIB has 24 pins, whereas a USB only has 4. The USB has a ...
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1answer
88 views

Arduino VIN driven LED strip not working

I have an Arduino Uno drawing power from a 9V wall adapter plugged into its power jack. I have a 12V LED strip connected to the VIN pin of the Arduino (positive side to the VIN, negative to GND, of ...
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4answers
117 views

Explantation for fried charger with Multimeter

I have a 9v AC to DC wall adapter that I use to power my Arduino boards. The label says it gives 9v at 1000ma but I wanted to test the validity of the label to troubleshoot. When I connected my ...
0
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1answer
55 views

adapter replacement for 12V 0.5A [closed]

Can I use a 12V DC 1.0A adapter in place of a 12V DC 0.5A adapter for my piano keyboard? The keyboard comes with a 12V DC 0.5A adapter but it is lost. I found a 12V 1.0A and wanted to know if it can ...
1
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1answer
80 views

My robot's motor has begun to spin slower, but it works perfectly if I use a different adapter with more voltage.. what does it mean?

I have the iRobot, a ping pong throwing robot. I've used it for years without any issues. At one point, my cats chewed out the original AC Adapter but luckily I had another one on hand from another ...
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1answer
117 views

PC fan DC adapter power requirement? [duplicate]

I just bought a 120mm deep cool fan with a rating of 12v, 0.07A (70 mA)= 0.84watts Currently I only have a 12v 2.5A (2500mA) DC adapter. I'm a complete noob in electricals...so the question is- Can ...
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0answers
76 views

What specs of power supply should I get for an IR controller for RGB 5050 LED strip?

Here's the story: Bought an LED strip kit (including 5M reel (150x5050 LEDs, rated at 36W), an IR controller, 12V, 2A AC-DC power adapter and a controller). The power supply failed after a few hours, ...
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1answer
150 views

Two power sources connected with one device, from where will get its power [closed]

Hello and thanks for your time reading my post. I've my router connected with its adapter and a battery for backup. Details: The adapter output 15V and 0.4A The battery output 12V and 12A The router ...
2
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1answer
305 views

AC-DC Adapter - Output lower than rating and what's this 'cont' output for?

I have a Canon AC adapter, Model K30321, that I'd like to use in a project. I'm attempting to test the adapter for correct voltage output. Adapter specs: ...
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1answer
114 views

Name of the HP Female Adapter Socket In My Laptop

I have this HP powerbrick with a 90W capacity (19v 4.7A) that I want to use in my project. I am planning to use it as a power source for my 50W LED. But I want to keep the male socket it has rather ...
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1answer
44 views

DC Adapter marked “9VDCX2”, what is the X2?

I have a keyboard that needs a 9v power supply. I've found one home that is marked as 9V DCX2. What does/can the "X2" mean after DC? It literally says "9VDCX2" Extra info: The adapter was originally ...
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2answers
100 views

Power Supply amp doesn't match with adapter. Can I use the adapter? [duplicate]

Can I use this LCD display: http://www.itontec.com/product-detail/product-name-7/ With this adapter: *Display Specs: Power Supply(5~12V 2A) *Adapter Specs: Output: 12V - 1A Is that safe to use ...
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1answer
1k views

Dropping 12V to 7.4V

I'm trying to power up my NXT Mindstorm Brick which needs 7.4V (at least, that's what the battery output is) with a 12V Power Adapter. I'm doing that because I want a constant supply from the socket ...
0
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1answer
144 views

AC DC adapter voltage regulation

I would like to make a dimmer for several ikea desktop LED lights. This one is plugged on a LED driver (adapter) with specifications: Primary:220-240VAC 50/60Mhz, 0.06A Secondary: constant current: DC ...
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1answer
207 views

Why are some AC/DC adapters light while others are heavy?

I was browsing the thrift store and found a nice pair of JBL 2.0 computer speakers, but they lacked a power adapter. They call for a 12V 1A supply. I have a ton of "bricks" lying around, but no 12V ...
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1answer
81 views

Need Help… So Confused with this QFP32 SA663 Socket

I purchased an SA663 clone QFP32 Socket online, but to my extreme dismay, it doesn't work, or at least I haven't been able to get it to. Basically the original SA663 is a 1:1 pinout. But after trying ...
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2answers
138 views

What do you call a transformer separated from a wall plug?

I got a hold of (from a friend) a AC->DC 5v 2a power transformer - it connects to the wall with lamp cord/ figure-8 connector, and has a USB plug on the other side. I can't for the life of me find ...
0
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1answer
146 views

How do I read my AC Adapter label. [duplicate]

My AC adapter reads... Output: +12V DC symbol 12.5A Input: 100-240V~ 50-60Hz 2.5A I would like some clarification on if i'm reading/understanding this ...
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2answers
150 views

how can i decrease the voltage of an AC-DC adapter without decreasing current (mAmpire)

i have an AC-DC adapter with 5volt 350mA (actually an old cellphone charger). i need to decrease it's voltage to 3volt. i tried adding a resistor in series & it worked, but it also decreased the ...
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2answers
143 views

run LEDs with cellphone charger

I wanted to run LED bulbs with a mobile phone charger/adapter ( input: 220v AC, output: 5v 350mA, nokia). but the LEDs become very hot & I'm afraid they may burn. i don't know the ratings of these ...
0
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1answer
153 views

Power adapter versus Power supply

I have a mini water-pump/motor hooked up to an LM338 (similar to LM317, but capable of higher current output). I set up the LM338 to create a 6.1-V output, from an 18-V input; this was done by ...
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2answers
82 views

Is it safe to connect battery in series with wall adapter?

Is it safe to connect a battery in series to wall via adapter? I have an AC adapter which gives me 10 vDC from the wall (220 volts). I've measured the adapter and it outputs 10 vDC. I have a 3 volt ...
0
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2answers
141 views

How do I connect the edge connectors on the PCB to a breadboard?

How do I connect the edge connectors on the PCB (shown in the below image) to a breadboard ? Are there any standard breakout boards or Adaptors available for this purpose ? Link to the user guide of ...
0
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1answer
66 views

Bad if I use adapter of higher Ampere? [duplicate]

I'm looking for an adapter for my Keyboard piano. I am not sure about the specifications of the original adapter, but I've looked up some online and I've found two adapters that supposedly should fit ...
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2answers
1k views

How to make an external PCI adapter that runs on USB3.0?

Motivated by old PCI (NOT PCIe) cards, and laptops without expansion slots, I want to try making a PCI-over-USB 3.0 solution. This is about 70% experimentation, and 30% actual use. Is this viable? I ...
2
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3answers
464 views

What happens if I supply a higher voltage than the rated voltage of my jack?

I want to replace the original jack from my notebook with a new one since it is broken (and I would like to avoid to replace it with the same as the original). The original AC adapter supplies 19V and ...
0
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1answer
30 views

Amperage for Sony SNC-VB630 Camera [closed]

I am trying to choose a right DC adapter for SNC-VB630 CCTV Camera but the only specs I could find in the official documentation was 'INPUT 12V DC'. Nothing about amperage. I have a 12V dc adapter ...
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2answers
632 views

Digital data coming out of a cell phone headset mic?

I want to connect a sound board / mixing console / whatever-you-prefer-to-call-it to the headset jack of my Motorola Android phone. I know the typical TRRS pinout of Left/Right/Ground/Microphone, and ...
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2answers
118 views

Does a typical mobile adapter draw current when no load is attached?

Summary: I am comparing the trade off of wasting my time daily plugging and unplugging multiple chargers at multiple sockets. I need to know approximately how much Amp is my adapter drawing every ...
0
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2answers
1k views

Do I use a 5V 2A or 3A DC adapter to power my 2m (6.5ft) WS2801 LED strip?

(Please excuse me if my English is bad) I recently purchased a 5m LED strip, but I only need to power approximately 2m (6.5ft) of the 5050 RGB LED WS2801 strip, but I'm afraid that a DC power adapter ...
0
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1answer
52 views

Max Current Output [duplicate]

Looking around at a couple of power supplies that I own such as a guitar pedal adapter that says it puts out 9V and 1700mA max, how does a power supply like this work so that it doesn't put out too ...
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1answer
392 views

Unregulated AC-DC adaptor voltage response

This is my first post. I'm a long-time computer programmer but new to this field of hobby electronics. I bought a 12V 800mA AC/DC adapter to feed my circuits. Seems it's unregulated since the ...
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2answers
543 views

Powering SMD 5050 strip via LM2596 DC/DC converter

I decided not to order / use the power supply typically sold with SMD 5050 kits. I heard a lot of explosion stories regarding those dodgy stuff. I want to make my own (power supply to drive SMD 5050. ...
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1answer
114 views

What is the use of this pin in my AC to AC converter [closed]

I am using a 9V AC converter for a digitech product. But I notice that there is a pin in a socket kind of thing in the adapter. What is the use of this pin?
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1answer
244 views

Supply voltage drops AFTER connecting to device [closed]

I have a 19V 2.1 amp (power mentioned is 45 watt) laptop adapter connected to a 19V 2 amp laptop (in description power mentioned 10.2 watt). When I plug the adapter, the multimeter shows the rated ...