https://ujwalnk.github.io/blog/blog/Technical posts and articles of my interest. 2026-08-04T22:08:34+05:30 Ujwal N K https://ujwalnk.github.io/blog/blog/ Jekyll © 2026 Ujwal N K /blog/assets/img/favicons/favicon.ico /blog/assets/img/favicons/favicon-96x96.png 2026-07-30T00:00:00+05:30 2026-07-30T00:00:00+05:30 https://ujwalnk.github.io/blog/blog/posts/caddy/ Ujwal N K

If you’ve been self-hosting for a while, you’ve probably run into this at least once. You spin up a new Docker service, publish a port in docker-compose.yml, add a route to your reverse proxy, and move on. A few weeks later, you remove the service—but forget to remove the published port. Repeat that enough times, and you end up with a collection of stale port mappings that no longer serve any ...

2025-02-01T00:00:00+05:30 2026-07-30T22:57:08+05:30 https://ujwalnk.github.io/blog/blog/posts/smps/ Ujwal N K

Designing and building an SMPS (Switch-Mode Power Supply) from scratch is no small feat. Our goal: Create an SMPS with completely isolated outputs at standard voltages (+12V, -12V, +5V, -5V, and +3.3V), each capable of delivering up to 1A. The input would be standard AC mains voltage. Here’s an account of how we achieve this—complete with calculations, rewinds, and a few twists. We tried mult...