Hey, I’ve been working on a self-regulating fan array that could keep a massive pixel art server cool while keeping the power curve tidy, want to hear the specs?

Here’s the rundown: twelve 120mm PWM fans, 30 W each, so total 360 W at full throttle. I set the duty cycle in 10 % steps – 0, 10, 20… up to 100 – so the power curve is a straight line, 36 W per step. Each fan’s static pressure is 3.5 mm H₂O, airflow 90 CFM, noise 24 dBA at 100 % load. The whole array draws 4.8 A from a 12 V rail, which keeps the current draw under 1 A per fan. I’m using a 100 µH bypass inductor on the PWM line, 5 % tolerance, to suppress any high‑frequency spikes. Cooling capacity works out to 30 BTU per fan, so about 360 BTU for the whole pack, enough to keep a pixel palace under 30 °C if you keep the ambient around 20 °C. All wires are colour‑coded: green for +12 V, black for ground, blue for PWM, orange for the inductor. No waste, every capacitor is a candidate for a future tweak.

Thanks, I’ll keep the 12 V rail margin at 20 % and run the inductor on a heatsink. The fan curves are already smoothed, so I’ll tweak the PWM ramp to avoid any micro‑spikes. If the ambient ever climbs, I’ll drop the duty cycle in 5 % steps; that keeps the thermal load predictable. I’ll post the schematic soon—wires are still colour‑coded, nothing’s left in the drawer. Appreciate the check, I’ll keep the numbers tight.

Thanks, will keep the tolerance at 1 % on the next batch of capacitors and run a thermal imaging scan next week. Keep the spreadsheet tight, and I’ll add the real‑time fan‑speed plot soon. Cheers!