Sending signed transaction with Web3

index.js

import Common, { Chain } from '@ethereumjs/common'
import { Transaction } from '@ethereumjs/tx'
import Web3 from 'web3'

const web3 = new Web3('https://ropsten.infura.io/v3/blablablabla')

const account1 = 'YOUR_ACCOUNT_1'
const privateKey1 = Buffer.from('YOUR_ACCOUNT_1_PRIVATE_KEY', 'hex')
const account2 = 'YOUR_ACCOUNT_2'

const sendSignedTransaction = async () => {
    const txCount = await web3.eth.getTransactionCount(account1)
    const { toHex, toWei } = web3.utils

    // Build the transaction
    const txData = {
        nonce: toHex(txCount),
        to: account2,
        value: toHex(toWei('1', 'ether')),
        gasLimit: toHex(21000),
        gasPrice: toHex(toWei('10', 'gwei'))
    }

    const common = new Common.default({ chain: Chain.Ropsten })

    // Sign the transaction
    const tx = Transaction.fromTxData(txData, { common })
    const signedTx = tx.sign(privateKey1)

    const serializedTx = signedTx.serialize()
    const raw = '0x' + serializedTx.toString('hex')

    // Broadcast the transaction
    const txHash = await web3.eth.sendSignedTransaction(raw);
    console.log('txHash: ', txHash)
}

sendSignedTransaction()