This is the bare PCB you need to build your own 20mm FET driver with an LDO as well (used for 2S+ input electronic switch).
- FET: LFPAK56 N-Channel Mosfet
- LDO: SOT-23-5 LDO such as the AP2204K
- C1: 16V+ 10uF MLC capacitor, 0805 (X5R or better preferred)
- CLDO: 10V+ 10uF MLC capacitor, 0805 (X5R or better preferred)
- R1: Use 36K 1% 0805 resistor for 2S or 3S zener mod LVP
- R2: 4.7K, 1% resistor, 0805
- UI: ATTINY13A MCU, SSH or SSU variant
- Spring / LED leads
- Pad with side closest to MCU can be used as electronic switch pad (no OTC installed).