https://sidhantgurung.me/ Lab notes, writeups, and debugging stories from Sidhant Gurung — EE undergrad at UT Arlington working on hardware, RF, and embedded systems. en-us sidhant@sidhantgurung.me (Sidhant Gurung) Sun, 19 Apr 2026 18:00:00 -0500 hand-crafted with care https://sidhantgurung.me/#blog/hfa-motor-driver sidhantgurung.me/blog/hfa-motor-driver-2026-04 Sat, 12 Apr 2026 14:30:00 -0500 The BS170 MOSFET I originally spec'd for the haptic motor driver on the HFA board kept getting warm under sustained PWM. After a few hours on the bench measuring Vgs thresholds and on-resistance across duty cycles, I switched to a 2N2222 NPN BJT and the thermals settled. Full writeup with scope traces and the decision criteria I used. https://sidhantgurung.me/#blog/qorvo-rf-prep sidhantgurung.me/blog/qorvo-rf-prep-2026-03 Mon, 24 Mar 2026 09:00:00 -0500 Going into the Qorvo Applications Engineering final round, I had maybe 60% of the RF fundamentals I needed and zero practice talking about them out loud. Here's the study plan I built, the resources that actually moved the needle (hint: not YouTube), and the two Smith chart problems that showed up in the interview.