RP2040 Dual TLC5940 High-Current LED Driver Board

High-Current 12–30V 20A N-Channel MOSFET H-Bridge Motor Driver Board

Open Hornet 16-channel 28 V magnetic-hold coil driver for Honeywell ET switches. Arduino Mega/Pro Micro logic inputs drive low-side 100 V MOSFET channels for ET switch magnet coils with common ground, fail-safe pulldowns, 100 V flyback protection, dedicated 28 V coil input, and conservative high-current 4-layer PCB routing.

300 W universal-input isolated offline SMPS based on a modified ATX-style architecture. Universal 115-230 VAC, 50/60 Hz input via fused IEC C14 inlet. Outputs: +12 V at 20 A, +5 V at 14 A, +3.3 V at 12 A, +5 Vsb at 2.5 A, and -12 V at 0.3 A. Includes primary rectification with GBU806 bridge, bulk capacitors, bleeders, snubbers, main PWM and driver transformer, standby flyback, optocoupler and TL431 feedback, supervisor logic, test points, fan and heatsink provisions, and 2-layer FR-4 PCB layout with 8 mm primary-secondary isolation and heavy copper routing on high-current rails.