Test and Measurement

Hi  I am looking for a battery holder that delivers 1.5 volts for a dolls house lights. I think I want 4 or 6 AA batteries.   How can I tell if the RS holders delver in series or parallel? Thanks

Home WiFi mobile phone computer speed measurement in the same environment, the same platform with the same node speed measurement between the two bands is nearly 5 times the actual difference between the two bands is so big or 5g reception of mobile phones is inflated if the actual gap is so big what is the recommended single 5g band wireless card

For family and friends over recent years I have recycled several Li-Ion batteries. Several were difficult to extract from older cameras and phones and had swelled significantly! My question is I know using/charging swollen Li-Ion batteries has a fire risk, but what about old presumably discharged batteries that then swell? I went through all my old cameras and phones and then found two in the same state! I'm sure I'm not alone with old equipment so it would be useful to have an answer.

Do I have to change cartridges anytime I want to solder at a different temperature?

When the flux is applied to the electrical leads being soldered, it removes oxidation and prevents air flow into the leads, thereby preventing further oxidation. Solder adheres more easily to non-oxidizing metals, so this way the solder flows evenly over the electrical leads. Since the solder is evenly distributed in the electrical leads, its conductivity will also be improved.

I saw a video that shows soldering SMD devices using a heat gun. So I am wondering what heat gun will work the best? It looked like the device centered itself on the PBC lands as the soldier paste liquidizes. It looked a lot quicker and a lot easier than using a soldering iron.

Hi! I'm currently in need of assistance. I'm trying to work on a project for my home and it's about controlling all my appliances with Wi-Fi. I've made a post like this on KiCad but would need more assistance with regards to the electrical part. I want to make small nodes. There'll be a separate node for main switches, then from the washroom switches, and maybe a third switch to control a window curtain control node. I would like to make different nodes and they'll all have some means of communication. From a personal research I conducted, the only thing I found similar to what I want to design was this. I just need help with the electrical aspect. Although, I've previously worked on ESP32, I'm not sure of me next steps. From what I recall, I think I might have to make some ESP32 mesh networks for multiple nodes to talk to the parent node. Any suggestion will ne truly appreciated. Thank you very much in advance. Keonte.

Hey there. Wondering if someone can direct me to the right product for this job. Or put their hand up to take on the project.  I'm looking to create a jackpot scoreboard of sorts. Everytime someone pays a dollar at my venue, I want to be able to see an electronic scoreboard increase. So a simple push of a button should take the value up by 1.  Hopefully someone in here can help direct me to the right product.    Chris

Hi I would like to know, if anyone can suggest a circuit design which can be used for harvesting sufficient electricity from wi fi radio signal to power led bulbs of various colours. Ideally the circuit would also be switchable on and off using the Wi-Fi signal. Would that extra complication need too much power?

PCB Part Library Loader のダウンロードサイトが見つからない、Samacsysパーツファインダーを開くと Electronic Component Search Engine だけが表示される。

Howdy I found on the web something called "TL Smoother" for stepper motors. What is it and how does it work? I am thinking about adding one to a current design. If I do add it I need to use smd 1N5404 diodes. Does anyone know the part number for these smd diodes?  

Hi I'm looking for someone who can write c++... For linear high speed cmos scan...  Microchip 32bit microcontroller... 

An error (BFFF0015) occurs when retrieving oscilloscope waveform data in Labview. This vi originally controlled other oscilloscopes with GPIB. This time, when I replaced the oscilloscope and connected it via USB, this problem occurred. I can control the new oscilloscope with the test vi, so I don't think there are any problems with the connections or drivers. There is an error in the measuring instrument auxiliary part of the image. In Instrument Assistant, the command is a waveform: DATA? Is set to. In Clie's analysis, the timeout is set to 3000ms and the measured frequency is 100MHz. Probably the cause of the error is the wrong command. Please let me know if you have any commands or other solutions.

Labviewでオシロスコープの波形データを取得するところでエラー(BFFF0015)が出ている状況です．このviはもともとGPIBでほかのオシロスコープを制御していたものです．今回，オシロスコープを新しくしてUSBでの接続にしたときに今回の問題が発生しています．テストviで，新しいオシロスコープを制御できているので接続やドライバーは問題ないと考えています．画像の計測器アシスタントの部分でエラーがでます．計測器アシスタントの中はクリエで解析でコマンドをWaveform:DATA?にしておりタイムアウトは3000ミリ秒にしており測定している周波数は100MHzです． おそらくエラーの原因はコマンドが間違っているのだと考えています．コマンドを教えていただきたいのと，ほかの解決策などありましたらご教授ください．  

My question : how can we replace the relay in a battery charger by one or two MOSFETs? I imagine a P MOSFET mounted as a polarity protection and directly charging the battery through a schottky, and the voltage of the battery sensed by a BJT thru a voltage divider that will block the MOSFET as the battery reaches 14 volts or so. What would be the values of the components : transistor (N? P?), voltage divider... Can you explain on that?