Questions tagged [adapter]

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.

Filter by
Sorted by
Tagged with
18
votes
4answers
11k views

Cellphone charger has no transformer?

I opened up a really tiny mobile phone charger I have, to see how it is designed. The entire "charger" is integrated into a small 2-pin mains plug, 1 x 1.25 x 0.5 inch, that has an USB socket for the ...
17
votes
1answer
10k views

How do these new-fangled phone chargers achieve step-down?

There appear to be two kinds of power supply adapters in market. The first/older kinds were such that they were reasonably heavy and had a small transformer inside the adapter itself. The newer ones ...
14
votes
2answers
7k views

Is it normal for DC wall adapter power supplies to provide voltages above the nominal ones?

When I measure a 9V DC wall adapter power supply with a multimeter it shows 11.8V. When connected to my board this voltage lowers to 10V. Is this normal? Should I be afraid of toasting my 1117CD-5.0 ...
14
votes
2answers
882 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 ...
13
votes
6answers
54k views

Is it possible to power a cordless drill from wall socket adapter?

I have a dewalt 18V cordless drill. I am wondering if it is feasible to build an adapter that can power the drill from a standard US wall socket? A typical DeWalt drill needs 2.6 amps with no-load. I ...
11
votes
3answers
6k views

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), ...
9
votes
6answers
2k views

DC adapters: why so few amps?

If I have a device that draws 5 amps at 12 volts, I can use any 12 volt DC adapter that can provide at least 5 amps. Why don't all DC adapters have the capacity to provide loads of amps!? If all DC ...
9
votes
8answers
7k views

Is it safe to use a DC power adapter that isn't UL Listed or CSA certified?

I picked up a 9V switching DC adapter from SparkFun a while back, but I've been hesitant to use it because it doesn't have any of the usual "safety" approvals that you normally see on power adapters (...
9
votes
5answers
2k views

Difference between these RF adapters

Can someone explain me the differences between these two RF adapters. I know the one on the right is better (and much more expensive as well) but is there a difference in the functioning of these ...
9
votes
3answers
20k views

Reading and understanding electrical specs on laptop AC adapters

My Dell laptop comes with an AC adapter with the following specs: 65 W Input AC: 100 - 240 V, ~1.5 A, 50 - 60 Hz Output DC: 19.5 V, 3.34 A My HP laptop: ...
9
votes
2answers
8k views

How do those 3.5mm stereo to mono adapters work?

I have one of those 3.5mm Female Mini-phone mono to Mini-phone stereo which I was hoping to use for connecting the output of an MP3 player (stereo) to a pillow speaker (mono). But then it occurred to ...
8
votes
4answers
16k views

How to utilize HDMI port on FPGA (basic)

Two questions. I have a Xilinx Spartan 6 FPGA which only has HDMI ins and outs. Is there some sort of guide or pre-written code that I can use to start sending images to the screen? I have no idea ...
8
votes
1answer
2k views

Determining if a power supply is isolated?

I've been looking for a low cost adapter I can use to power some electronic circuits I'm playing with. Pretty much the only requirement I have at this time is that the adapter is mains isolated for my ...
7
votes
3answers
4k views

Apple Desktop Bus (ADB) to USB Adapter

I have an old Apple keyboard that I would like to use but it uses the ADB bus instead of the newer USB bus. Griffin used to produce a product called the iMate which was an ADB-to-USB converter but ...
7
votes
3answers
49k views

AC adapter: Input power vs Output power

When I look at, let's say an iPad AC adapter, the input/output rating on the charger states: Input: 100-240V 0.45A (AC) Output: 5.1V 2.1A (DC) I know that the ...
7
votes
2answers
69k views

Converting Power/Watts in DC to Power/Watts in AC?

How can we convert Watts in DC to Watts in AC? for e.g A device needs 1A and 12V DC input i.e (1A x 12V = 12 Watts) 12 Watts DC. If we use an AC to DC adapter/converter to generate 1A,12V (12Watts) DC ...
6
votes
3answers
51k views

Is it okay to keep a USB charger plugged into the cigar lighter?

I have a USB micro charging adapter for my smartphone for my car. It is basically a cigar lighter plug that turns into a USB micro plug. When I don’t have my phone connected, and as such don’t want ...
6
votes
1answer
255 views

AC / DC adaptor, unexpected voltmeter reading

I'm planning on using an AC/DC power adaptor to power an Arduino and various devices. Before actually powering up the Arduino with the adaptor I wanted to play with the AC/DC adaptor, as it has ...
5
votes
5answers
3k views

How to deal with a DC adapter with irregular voltage output?

Background information: I tried hard to get a Schmitt-trigger working, but it kept failing. By accident I figured out, that my AC-to-DC adapter produces a very irregular voltage output (I could hear ...
5
votes
2answers
1k views

What's the rationale behind “wall wart” plugs? [closed]

It's more of a curiosity question than a real problem, but since I've run out of wall sockets again, I'd like to ask you - is there any particular reason or use case in which "wall wart" AC adapter ...
5
votes
2answers
5k views

Connecting power source to Arduino's 5V pin

I have an Arduino board connected to a Neopixel Ring. This Ring draws more than 0.5 Ampere, so it needs its own power supply (not drawing power via the Arduino board) I found this schematic that ...
5
votes
2answers
2k views

How to power a scanner light with adapter, not battery?

Sorry for the noobish question. I'm a computer scientist, so my electrical engineering knowledge is of the "don't put fingers in electrical outlet" level. I'd like to know how to power a salvaged ...
5
votes
1answer
1k views

Laptop power supplies - why the spectrum of voltages and connectors?

Why do are laptops designed with different Voltage input requirements? Is this just a power requirement consideration, or something more technical? Maybe the lithium battery requirements? (And - for ...
4
votes
4answers
544 views

Why are these traces shaped in such way?

Please look at this image(see the PCB traces within the circles). This circuit belongs to a laptop adaptor. What are those parallel soldered-traces on the PCB traces? Why aren't they soldered to ...
4
votes
3answers
7k views

How can I plug an arbitrary USB device into two computers?

Ultimately, my goal is to have a "keypad" with between 5 and 10 buttons, where pressing one of those buttons effectively presses some key on two computers simultaneously. In the ideal scenario, the "...
4
votes
4answers
5k 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 ...
4
votes
1answer
675 views

Electric shock from outdoor security cameras

I just bought this outdoor security camera kit from Amazon. (Amazon product link) When wiring it up, I noticed that I got a small sharp shock when touching the small screws on the metal casing ...
4
votes
4answers
889 views

Best way to connect a RS-485 device

I have to control a device with a C++ application (Windows) via RS-485. I'm wondering, which would be the best way to connect it. Should I use a USB-RS485 adapter (which would be the most flexible ...
4
votes
2answers
2k views

DIY 24v to 5v usb phone charger

I want to make a adapter from a vehicles 24v to a 5v usb phone charger. Can I simply connect the wires from a cigaret lighter jack to a usb and add a resister in between (using a voltage divider)? If ...
4
votes
1answer
106 views

Is it possible to make a multi-display adapter as an independent project?

I've been looking at the Matrox DualHead2Go, which is essentially the best/easiest way to go about using dual monitors for a MacBook Pro. Some people suggest using a USB to VGA or HDMI - but obviously ...
4
votes
2answers
334 views

4x4mm QFN-16 to 3x3mm QFN-16?

Ok, so I goofed... accidentally spec'd a 4mm footprint for a 3mm real-time-clock-calendar IC. Rather than scrap these boards, I'm thinking of designing a double-sided PCB "adapter" to go from the ...
4
votes
1answer
2k 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: ...
4
votes
1answer
133 views

How do USB to serial adapters work?

I'd like to know how a USB to serial adapter (such as the FTDI FT232RL chip) works. The way I think it does is the following: Picture a system composed of a MCU, a USB to serial adapter and the PC ...
4
votes
1answer
909 views

Connect two Ac to Dc adaptors in series

I have a modem with a rating of 10 VDC and 1A but I dont have a adaptor for it. Instead I have two 5VDC and 1A adaptors. Just wanted to know if I connect these adaptors in series would It work ?
3
votes
5answers
11k 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 ...
3
votes
2answers
1k views

Can I set the slider on my universal adapter between 4.5V and 6V to get 5V?

I have a dehumidifying cabinet which requires 5V 900mA, and I have a universal adapter that is rated at 1000mA 12V, however the slider doesn't have a 5V marking, only 4.5 and 6V. Is it okay to point ...
3
votes
3answers
567 views

Replaced 4x AA battery with 6V 3A DC adapter, but device won't work

I'm hoping you smart folks can help me. I'm puzzled by what I thought would be a simple DC battery to DC adapter swap. The device I'm trying to mod is a a microchip activated pet door (SureFlap ...
3
votes
5answers
72k views

acceptable bounds for replacement DC adapter [duplicate]

Possible Duplicate: Chosing power supply, how to get the voltage and current ratings? I've got a broken gadget that is discontinued. The only thing broken is the power supply (verified by my ...
3
votes
2answers
8k views

Is there an easy way to test if my PS/2 -> USB adapter is passive?

I own a couple of PS/2 to USB adaptor/converter connectors that look like the following: Is there anyway to test if these adapters are passive without disassembling them (or risking damage by ...
3
votes
3answers
2k views

Are power supplies for USB drive enclosures required to have UL certification?

I bought a cheap USB hard drive enclosure off eBay. It turns out that the power supply has absolutely no electrical certifications for either the US or EU (no UL, CE marks). Is electrical ...
3
votes
1answer
191 views

Looking for an “SMA signal polarity inverter”

I found one of these lying around in my microwave/RF lab and I was wondering if it has a technical name and if I can build one myself: It has SMA connectors at the two ends. It flips the polarity of ...
3
votes
1answer
1k views

Is it possible to power an AC-to-DC switching adapter with a DC input?

Typical "wall-wart" switching power adapters are often rated for ~110-240V 50-60Hz AC input and output low-voltage DC. For this question let's assume the output voltage is 5V DC. Internally, the ...
3
votes
2answers
6k views

Wireless 2.4GHz to Bluetooth? [closed]

I've been wondering about this for a while; I have a Wireless 2.4GHz keyboard that requires a USB reciever to catch the signal. How great would it be though if I could use it on my phone, for ...
3
votes
1answer
4k views

What is the proper name or part number of a 12V DC female car adapter with leads?

I've searched hobby sites like SparkFun, Digikey, BGMicro, and Jameco. I'm starting to wonder if I'm calling this item by the wrong name. What I'm looking for, exactly, is a 12V female car adapter ...
3
votes
1answer
208 views

Can I power an interactive 'live' wall with copper tape and a 15v ac adapter?

I'm working on a class project to make a living wall with LEDs, paint, and copper tape spiral magnet speakers. I have a 15v ac adapter to power the wall and copper tape to connect the LEDs in parallel ...
3
votes
1answer
261 views

Why would a USB-C adapter have a pull-up resistor?

I'm talking about a USB type-C male to USB type-A female adapter, the ones you need to connect a USB flash drive to the latest MacBooks. According to USB-C specification, this sort of adapter needs a ...
3
votes
1answer
18k views

Xbox one power adapter wiring - converting it to a 12 volt power supply

Thanks for having a look at my question. I know this may seem like an odd question but here is the history of it. I have a Solidoodle 4 3D printer, Its powered by a knock off xbox 360 brick adapter ...
3
votes
3answers
2k views

Motor Driver IC Heats-up

I have a TB6612FNG motor driver module. Here is the manual of the module: http://www.nex-robotics.com/images/downloads/tb66fng%20dc%20motor%20driver%20module.pdf I ...
3
votes
2answers
75 views

Why is the 240VAC-12VDC giving both 12VDC and 26VAC as output?

I was using this adapter to power a 12VDC LED strip and felt electric shock from the output wire. When I measured the output with a multimeter, I found both 12VDC and 26VAC on it's output. What could ...
3
votes
1answer
2k views

How to power STM32F103C8T6 in a 'real' project?

I'm sorry for this probably very generic question, but I cannot find a good answer. I have several STM32(F103C8T6, a.k.a. Blue Pill), which I now power via a ST Link (giving 5V via USB). The STM32 ...