These are the most complex chips in this section. Some users will get better performance from the H-bridges listed above or Haptic Feedback Chips, so be sure to check these other lists. These can, of course, be used to drive normal DC and gearmotors too as they output a DC voltage, however, some of them are specifically branded for the vibration motor market. Some are fixed and some are adjustable, but most can be controlled by PWM to vary the speed. These ICs will enable you to achieve consistent vibration motor performance across the entire battery range. When using batteries, the supply voltage will vary depending upon the battery’s level of charge – when using a transistor this results in a varying performance from the vibration motor. They operate in a similar method to the transistor chips above, but provide a different output voltage to the supply voltage – much like low-dropout voltage regulator (worth researching). There is a small selection of components that are specifically designed to operate vibration motors with a simple on/off drive pattern. The chips below are all full H-bridges and a couple are ‘dual’ (can drive two motors). There are many different types of design, including ‘half bridges’ and ‘dual H-bridges’. You can either build it yourself using the MOSFETs above with a reference circuit or purchase a single discrete chip. This makes them great for gearmotor applications, or anything where you might want need to rotate the motor both ways. Manufacturerīuilt using 4 transistors, H-bridges enable you to easily reverse the polarity of the applied voltage to change the rotation direction. We have previously used the ones below in-house. Thousands of different devices exist, far too many to list here. There are different types of transistor, here we suggest two MOSFETs one n-channel (switch closed with high voltage at the base) and on p-channel (switch closed with low voltage at the base). They can also be used with PWM signals to vary the level of voltage.
By closing the switch the transistor can connect the motor to a suitable power supply where it has access to sufficient voltage and current.
Transistors act like an electrical switch, enabling a low current or low voltage source (like a microcontroller) to drive a motor.
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