Intro

A pcb with a single button, which on each press toggles a mosfet's output on/off, acting like a mechanical switch.

PCB

Specs

• Current troughput theoretically: around 10A
• PCB input voltage: 3.0V - 5.0V
• Thicc exposed mosfet traces to create solder wires

Properties

• Power consumption
  • Switched off:
    • 0.0 uA @ 2.5 V (= less than 100 nA)
    • 4 uA @ 4.2 V
    • 25 uA @ 5.0 V
  • Switched on:
    • 240 uA @ 2.5V
    • 500 uA @ 4.2V
    • 500 uA @ 5.0 V
• Initial state is off
• Two n-channel mosfets in parallel for high current support
• Green status led (optional)
• Debounced button

BOM

R1: 0805 sized, 10k R2: 0805 sized, 10k R3: 0805 sized, 10k C1: 0805 sized, 100nF C2: 0805 sized, 100nF U1: SOIC14 package, CD4013BM U2: sot23-3 package, AO3400 U3: sot23-3 package, AO3400 S1: Tactile switch CK (Metal shell) D1: 3528 sized, RGB led with common VCC

Usage

• Connect e.g. a li-ion battery's GND to the pcb's GND
• Connect li-ion VCC to pcb's VCC
• Connect li-ion VCC to e.g. a motor's VCC
• Connect pcb's DR to motor's GND

Schematic