Hall Sensor Preamp

Piotr Zapart designed this board to overcome range issues when using traditional 300 degree potentiometers or Hall sensors as rotational angle to voltage converters:

hpre4

HALL Preamp/Analog axis calibrator

The idea was to create a device that will perform an axis calibration, usually done in digital domain, but before sampling the signal in the ADC, still in analog domain, using it’s advantageous infinite resolution

 HappPre_operation.png

the main function of this device is to:

  • Buffer the analog output signal coming from a potentiometer or another rotary angle to voltage converter like ie. Hall sensors.
  • Filter out the high band noise and limit the bandwidth to an usable range only, protect the input against voltage spikes.
  • Match the output voltage range of the source (pot/hall sensor) with the input range of the ADC, thus making the most of the available ADC resolution.
  • Linearize the hall sensor output signal response by amplyfing it’s most linear region to the full scale ADC input range.

The board is shared on OSH Park:

HALL Preamp

hpre2.jpgOrder from OSH Park

Hall Sensor Preamp