54tGgY

ELRS high-frequency head

Overview

Preface:
This tuner is a workaround; it works, but it's a bit wasteful. The tuner uses a two-layer board design,

constructed from an E28-27SX module and an ESP32 WROOM-32 module. The circuit board design includes tantalum capacitors, MLCC capacitors, and 7343D polymer capacitors. The tuner and remote control are connected using Teflon-plated silver wire to ensure sufficient HiFi performance. Only a 3.3V resistor to the BOOT pin needs to be soldered here. When flashing the firmware, simply short the BOOT pin to GND with tweezers. There is a 0402 LED; a resistor package is used to reduce the area. Actual product photos and testing show it works. Test video.

Design Files

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Update:2026-03-27 13:57:25

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