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Shared on March 21st, 2017 01:14.
LED sampler with constant-current drive. Current mirrors ensure each LED is driven by (roughly) the same current. Not for beginners (0603, SOT-363).
Uses Bel 0ZCJ0050AF2E PTC fuse, AP2112-3.3 LDO (for setting reference current precisely, but also supplies the LEDs), 330R resistor sets current to around 5mA per LED, Diodes DMN32D4SDW dual N-MOS (needs sorting) in SOT-363.