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2023-07-07

ali dcdc

https://www.youtube.com/watch?v=RBvZEMR7Uck

https://www.youtube.com/watch?v=d1HUDrWnfOA

3(4)A?

$3.74 $3.02 $2.88

35W Adjustable Automatic Buck-Boost Constant Voltage Constant Current High Power Step Up Down Power Supply Module SS56

$6? $5 $5 $5.05

35W DC 5.5-30V to 0.5-30V Digital LCD Display Automatic Step up down Buck Boost Converter Power Supply Module Adjustable Board

$8.93 $9.14 $9.20 $8.81 $8.38

https://www.youtube.com/watch?v=8fK_1DZijpk

https://www.youtube.com/watch?v=ydPWVL-Bw_Y

https://www.youtube.com/watch?v=RtgVrXXg-yY

12A 160W DC-DC Adjustable Step Down Buck Power Supply Module Digital LCD Display Constant Voltage Current Board ZK-JVA-12KX

$8.38

Output current: the fanless version can work stably in 4A for a long time, and the fan version can reach 6A

XL6019

https://www.youtube.com/watch?v=tGiX2kadyaw

https://www.youtube.com/watch?v=MvbDaIZpRy8

https://www.youtube.com/watch?v=tGiX2kadyaw

1(3)A

$4.47

LM25116

https://www.youtube.com/watch?v=ZutZP6PVzFw

https://www.youtube.com/watch?v=trREZxNrOJ4

6(10)A

$5.22 $5.48 $5.48

$9.42

ZK 4K

https://www.youtube.com/watch?v=TTFloQp54u0

$10

How to Upgrade a 3 Amp Step Down Module to 60 Amps

Shipping: €5.16

2023-06-20

2023-06-11

js

https://jsonplaceholder.typicode.com/posts

var firstName = "Jamila";

console.log(typeof firstName); //string

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference

console.log(Object.values(person));

console.log(Object.keys(person));

console.log(JSON.stringify(person))

const advice = document.querySelector(".advice");

advice.textContent = "asdf";

btn.addEventListener("click", fnBtn);

arrays: map find reduce sort

datas = [{id:1,title:'adsf'},{id:2},{title:'asdf3}]

datas.find((id)=> d.id===id)

const id = data?.id? ?? 0;

const arry = [1,2,3]

console.log(arry.map((el)=>el*2)) //2,4,6

console.log(datas.map((el)=>el.id)//1,2

const dataNew = datas.map((data)=>({

dataId:data.id;

dataTitle: data.title;

}))

const pages = books.reduce((accu,book)=>accu + book.pages,0);

//initial value could be a number 0, array [], object {})

//unlike map filter, the sort mutated the array

[2,1,3].sort((a,b)=>a-b) //[1,2,3]

//to preserve the original array, we create a copy first:

data.slice().sort(a,b=>b-a)

const booksAfter = [...books, newBook] //spread operator (not rest)

2023-06-03

Java

https://www.youtube.com/watch?v=X80nJ5T7YpE Spring Boot + JWT

https://www.youtube.com/watch?v=t4-416mg6iU OAuth

/libs/some.jar

mvn install:install-file -Dfile=some.jar -DgroupId=asdf.com -DartifactId=artif -Dversion=1.9.9 -Dpackaging=jar -DgeneratePom=true

2023-06-02

power supply

https://www.youtube.com/watch?v=oqVrS08UOW8

Импульсные СТАБИЛИЗАТОРЫ НАПРЯЖЕНИЯ и ТОКА. Как они работают

SEPIC - повышающий и понижающий стабилизатор

2023-05-28

Vue.js

Vue.js cheatsheet https://devhints.io/vue

https://vuejs.org/guide/essentials/lifecycle.html

2023-04-22

shotcut

mask simple shape

blur box

mask apply

/////////////

https://www.youtube.com/watch?v=_HzWTY8oYoU

add video track

add other - color

grab this color to the new video track

add mask "size, position, rotate"

2023-04-21

aws lambda

https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/migration-whats-different.html

A noticable change from the the SDK for Java 1.x to the SDK for Java 2.x is the package name change. Package names begin with software.amazon.awssdk in SDK 2.x, whereas the SDK 1.x uses com.amazonaws.

https://github.com/awsdocs/aws-lambda-developer-guide/tree/main/sample-apps

https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/lambda

https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javav2/example_code/dynamodb/

https://docs.aws.amazon.com/lambda/latest/dg/java-samples.html

https://docs.aws.amazon.com/lambda/latest/dg/getting-started.html

https://docs.aws.amazon.com/lambda/latest/dg/example_cross_LambdaScheduledEvents_section.html

https://docs.aws.amazon.com/lambda/latest/dg/example_cross_LambdaAPIGateway_section.html

https://www.youtube.com/watch?v=A1rYiHTy9Lg Deploy a SpringBoot API on AWS Lambda in 10 minutes

        "Access-Control-Allow-Credentials" : true // Required for cookies, authorization headers with HTTPS

backend must return the applicable CORS headers https://docs.aws.amazon.com/apigateway/latest/developerguide/how-to-cors-console.html

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2023-07-08

power

XH-M609 DC 12V-36V Charger Module Voltage OverDischarge Battery Protection Precise Undervoltage Protection Module Board

0-30V 2mA-3A DC Regulated Power Supply DIY Kit Continuously Adjustable Current Limiting Protection Voltage Regulator Set

18650 Battery Charge Shield Board Micro USB Port Type-A USB 0.5A 5V 3.3V For Arduino/ Raspberry Pi/ Nodemcu

Dual 18650 Lithium Battery Shield V8 3V1A 5V 3A Micro USB Power Bank Battery Charging Module For Raspberry Pi Wifi ESP8266 ESP32

USB for DC 12V Output 3x 18650 Batteries DIY Power Bank Box Charger Fit for Cellphone WiFi Router LED Light