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Researcher, University of Bristol

Our lab was interested in purchasing a syringe pump from WPI. The company's support was helpful in identifying the required model and even informed us of model-specific limitations (which were of no concern for our intended use). The overall processing and delivery was exceedingly fast – less tha...
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Noise Eliminator; Eliminate 50/60 Hz noise and harmonics without filtering

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A New Solution

WPI is proud to distribute the Hum Bug -- a new approach to Noise Control. This is a powerful new technology for cancelling electrical interference in real-time, avoiding all of the traditional problems associated with notch filters. The Hum Bug constructs a replica of noise present on the input signal and continuously subtracts this replica from the signal as it passes through the instrument. It performs this function in the presence of biological activity even when noise characteristics evolve over time.


The Hum Bug is not a filter. It does not create phase delays, amplitude errors, DC shifts or waveform distortion. Simply connect it between your preamplifier and any analysis equipment and it will automatically eliminate 50/60 Hz noise and harmonics with frequencies up to several kHz. Noise is eliminated without altering the signal of interest even when frequencies within the signal overlap with noise components. No settings or adjustments are required.

Figure 1. A hippocampal recording contaminated with line noise. The physiological signal remains intact as the HumBug removes the imbedded line noise.

Eliminates Electrical Interference

  • Simple 50/60 Hz Sine Waves
  • Mixtures of 50/60 Hz Harmonics
  • Noise Spikes from Dimmers
  • Complex Noise from Fluorescent Lamps

No Waveform Distortion

  • No Frequency Loss
  • No DC Voltage Shift
  • No Signal Attenuation
  • No Phase Error

Note: This product is only available to users outside of the UK. If you are in the UK, please click here.


Shielded steel instrument box with cast aluminum base

  • W-6.5“ D-7.5" H-1.3" (32,2 x 18.1 x 3.1 cm)
  • Power: 115-120 VAC at 60 Hz., 230-240 VAC at 50/60 Hz.

Input Voltages

  • Input protection: 50 volts peak to peak
  • Maximum input signal: 5 volts average peak to peak
  • Maximum noise amplitude 1 volt peak to peak

Frequency Response

  • Noise cancellation: 50/60 Hz and harmonics up to 4 kHz


  • BYPASS: halts noise cancellation
  • HOLD: suspends adaptation to evolving noise
  • CLEAR: clears the noise replica


  • LED indicates changing noise levels
  • GREEN: decreasing amplitude of the noise replica
  • RED: increasing amplitude of the noise replica



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Cuypers, K., Leenus, D., & Berg, F. van den. (2013). Long-term TENS treatment decreases cortical motor representation in multiple sclerosis. Neuroscience. Retrieved from

Cuypers, K., Leenus, D., & Wijmeersch, B. Van. (2013). Anodal tDCS increases corticospinal output and projection strength in multiple sclerosis. Neuroscience  …. Retrieved from

Farooq, U., & Rajkumar, R. (2013). Corticotropin-releasing factor infusion into nucleus incertus suppresses medial prefrontal cortical activity and hippocampo-medial prefrontal cortical long-term. European Journal of  …. Retrieved from

Haan, R. de, Lee, Y., & Nordström, K. (2013). Novel Flicker-Sensitive Visual Circuit Neurons Inhibited by Stationary Patterns. The Journal of Neuroscience. Retrieved from

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Liang, C., Howells, J., & Kennerson, M. (2013). Axonal excitability in X-linked dominant Charcot Marie Tooth disease. Clinical  …. Retrieved from

Lindgren, C., & Newman, Z. (2013). Cyclooxygenase-2, prostaglandin E2 glycerol ester and nitric oxide are involved in muscarine-induced presynaptic enhancement at the vertebrate neuromuscular. The Journal of  …. Retrieved from

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Quesseveur, G., & Repérant, C. (2013). 5-HT2A receptor inactivation potentiates the acute antidepressant-like activity of escitalopram: involvement of the noradrenergic system. Experimental Brain  …. Retrieved from

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Vasant, D., & Payton, A. (2013). The val66met polymorphism of brain-derived neurotrophic factor is associated with human esophageal hypersensitivity. …. Retrieved from

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Webster, R., Cossins, J., & Lashley, D. (2013). A mouse model of the slow channel myasthenic syndrome: Neuromuscular physiology and effects of ephedrine treatment. Experimental  …. Retrieved from

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