High performance four-channel amplifier and signal conditioner in one quiet package.
Brownlee Amplifiers
Amplification with sophisticated filter circuitry – Model 440
In addition to the Model 410’s features, the Model 440 offers an 8-pole Bessel lowpass filter, Auto-Zeroing, a line-notch filter, highpass filter, multiple memories per channel, and a digital voltmeter on 2 channels. A wide bandwidth of over 500 kHz at all gains insures smooth recordings.
Brownlee Precision Model 440
The Brownlee Precision Model 440 incorporates four channels of sophisticated amplifier and filter circuitry in a friendly easy-to-use instrument. Each channel consists of a high gain/low noise amplifier, an 8-pole Bessel lowpass filter, a highpass filter, a line notch filter, and output offset controls. A control knob sets the amplifier parameters, and the values are displayed on a bright LED alphanumeric readout.
- Clear front panel controls for all settings
- Gains from 0.1 to 10,000 in fine, calibrated steps
- Single-ended or differential inputs
- 8 pole Bessel lowpass filter with range 20 Hz to 50 kHz
- Highpass filter with frequency range .01 Hz to 100 Hz
- Output offset control to shift output up to +/- 10 Volts
- Auto-Zero feature to reset the output to the baseline level
- Notch filter to suppress line noise
- Digital Voltmeter on channels 1 and 2
- Memories which hold multiple setups
- Powerful output which can directly drive transducers
- Wide bandwidth: greater than 500 kHz on all gains
References – Brownlee 440
- Sustained Perceptual Deficits from Transient Sensory Deprivation J. Neurosci. 2015; 35(30): p. 10831-10842Melissa L. Caras and Dan H. Sanes
- Postural threat modulates human perceptions of balance-related movement The University of British Columbia, September 2018Taylor William Cleworth
- Na+/K+ pump interacts with the h-current to control bursting activity in central pattern generator neurons of leeches eLife, 19322, Sept 2016Daniel Kueh, William H Barnett, Gennady S Cymbalyuk, Ronald L Calabrese
- Lower-limb muscle responses evoked with noisy vibrotactile foot sole stimulation Physiological Reports. Volume 8, Issue 15, August 2020Ryan M. Peters, Robyn L. Mildren, Aimee J. Hill, Mark G. Carpenter, Jean-Sébastien Blouin, J. Timothy Inglis
- Loss of inhibitory tone on spinal cord dorsal horn spontaneously and nonspontaneously active neurons in a mouse model of neuropathic pain PAIN: July 2016 - Vol. 157 - Issue 7 - p 1432–1442Maria Carmen Medrano, Dhanasak Dhanasobhon, Ipek Yalcin, Rémy Schlichter, Matilde Cordero-Erausquin
- Frequency characteristics of heteronymous responses evoked by Achilles tendon vibration during quiet stance Neuroscience Letters, Volume 736, September 2020Gregg Eschelmuller, Robyn L. Mildren, Jean-Sébastien Blouin, Mark G. Carpenter, Timothy Inglis
- Frequency characteristics of human muscle and cortical responses evoked by noisy Achilles tendon vibration Journal of Applied Physiology, Vol. 122, Issue 5, May 2017, Pages 1134-1144Robyn L. Mildren, Ryan M. Peters, Aimee J. Hill, Jean-Sébastien Blouin, Mark G. Carpenter, and J. Timothy Inglis
- Developmental deprivation-induced perceptual and cortical processing deficits in awake-behaving animals eLife 2018;7:e33891, June 2018Justin D Yao, Dan H Sanes