Configure local Systemd-resolved DNS Resolver for Company Domains behind VPN

To send queries for the company internal (sub)-domains to the company DNS resolvers behind the VPN, the resolver can be configured with the following commands:

# Configure internal corporate domain name resolvers:
resolvectl dns tun0 192.0.2.53 192.0.2.54

# Only use the internal corporate resolvers for domain names under these:
resolvectl domain tun0 "~example.com"

# Not super nice, but might be needed:
resolvectl dnssec tun0 off

[via]https://www.gabriel.urdhr.fr/2020/03/17/systemd-revolved-dns-configuration-for-vpn/[/via]

Calculate series resistor for 0805 SMD LEDs with different colors

When I plan SMD LEDs for one of my PCB designs, I always ask myself which series resistors I need. At AliExpress dealer CHANZON Official Store I found the following nice overview. The series resistor can then be calculated with hte LED Resistor Calculator.