Show HN: 32V TENS device from built from scratch under $100
5 days ago
- #electronics
- #DIY
- #TENS
- Built a monophasic TENS device tailored for hand stimulation.
- Used a 3.7V LiPo battery with MCP73831 charger IC for power management.
- Created two voltage rails: +3.3V for logic and ~32V for stimulation pulses.
- Employed TPS55340 boost converter for stepping up to 32V and TPS63001 buck-boost for stable 3.3V.
- Chose ATmega32U4 microcontroller for control, featuring PWM outputs and ADC inputs.
- Designed output stage with N-Channel MOSFET and BJTs to gate 32V pulses.
- Arranged electrodes for each finger with palm as common ground.
- Total project cost was under $100.