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 a 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