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).

Parts Required:

• 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).