How to make an Electric Toothbrush?

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electric toothbrush
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Electric Toothbrush is unique among DIYers. Here is a simple design on how to make a battery-powered electric toothbrush.

Here is a design that functions as a control circuit and amplifier to an electric toothbrush motor. The design features an ultra-low-power microcontroller unit (MCU) for generating the appropriate waveforms to the H-Bridge motor driver. The motor driver amplifies the signal that is coming from
the MCU and drives the motor.

Electric toothbrush controller design features

  • Battery voltage ranging from 2 to 5.5 V
  • Delivers 5 A continuous and 8 A peak-drive current
  • Small PCB form factor of 43.2 x 14.6 mm
  • Low component count to reduce cost
  • Less than 50 nA Battery Leakage Current When Off

Key components used in the design

  • DRV8850: Low-Voltage, High Current, H-Bridge Motor Driver with LDO Voltage Regulator
  • MSP430G2210: 8-pin, 16-MHz Ultra-Low-Power Microcontroller
  • SN74LVC1G14: Single Schmitt-Trigger Inverter
  • SN74LVC1G80: Single Positive-Edge-Triggered D-Type Flip-Flop

Click here for reference design

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