Other Electronics
NeuroLog System
The Neurolog System from Digitimer is a rack system with a wide
variety of interconnecting modules for amplification, stimulation,
and signal processing.
Interconnection cables are minimised in the NeuroLog by a unique system of
automatically connecting module inputs and outputs via the case edge connectors. For many
linear arrangements of modules, this means that the only cabling is from the preparation
to the rack, and from the rack to your recording system. |
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Amplifier Modules
A range of amplifier modules covering many areas in electrophysiology.
| NL102G DC Pre Amplifier |
A direct coupled pre-amp for intracellular
recording. Includes capacity compensation & current injection |
| NL104A AC Amplifier |
A low-noise differential AC pre-amp with 8
gain ranges and 3 high cutoff settings |
| NL100AK Headstage |
A high impedance headstage for the NL104A
AC amplifier; ideal for metal microelectrodes |
| NL106 AC/DC Amplifier |
An AC/DC amplifier with similar controls to an oscilloscope vertical
channel (illustrated) |
| NL107 Transducer Amplifier |
A DC bridge amplifier suitable for pressure transducers and
similar devices |
| NL108A Pressure Amplifier |
A pressure transducer amplifier with two gain settings, for blood
pressures, or low pressures such as intra-tracheal pressures |
| NL120S Audio Amplifier |
A power amplifier for driving a 4-8 ohm speaker, suitable for
audible indication of spike trains. |
| NL820A Isolator |
Provides 4 channels of high-level signal isolation and power for
pre-amps such as the NL822 and NL824. |
| NL822/4 Pre Amplifiers |
Two- and four-channel pre-amps, with switchable gain of 100, 1000 and 1000,
for use with the NL820A Isolator. |
| NL850 Isolated pre Amplifier |
A pre-amp including isolation, suitable for measurement of EMG and similar
signals with the NL104A amplifier |
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Filter Modules
Analog filter modules for basic signal conditioning.
| NL125/6 Filters |
An active filter module (illustrated) with a low cutoff from 0.5 Hz to 5 kHz in 4 ranges,
and a high cutoff of 5 kHz to 50 kHz in 4 ranges. A 50 Hz notch (60 Hz in NL126)
is also provided. |
| NL134/5/6 4-channel Filters |
Four-channel second-order filters with a high-cutoff switchable from 10 Hz to 20 kHz in
14 steps, and a 50 Hz notch filter (in NL135; 60 Hz in NL136) |
| NL118 Octal Filter |
An 8-channel, first-order filter with three low-pass settings and three
high-pass (time constant) settings. |
| NL530 4-channel Conditioner |
A 4-channel module ideal for interfacing to data acquisition systems, with
front-panel presets for gain and offset and internal settings for low-pass
filtering and clipping limits. |
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Generators & Stimulators
Modules for pulse generation and stimulation.
| NL301 Pulse Generator |
An economical source of TTL pulses in a continuous train or individually
by pushbutton. |
| NL304 Period Generator |
A stable pulse source which is gateable or synchronisable, with eight
decades of pulse rate (illustrated). |
| NL401 Digital Width |
A retriggerable monostable pulse generator which produces output pulses
of a fixed width, in six decade ranges. |
| NL403 Delay-Width |
A monostable pulse generator producing pulses of adjustable duration
after an adjustable delay from the trigger pulse (both timings settable from
1 µs to 10 s). |
| NL603 Counter |
A two digit pulse counter with display that may also be used a frequency
divider for constructing more complex pulse protocols. |
| NL510 Pulse Buffer |
This module converts TTL logic pulses into analog pulses of adjustable
amplitude for driving a stimulus isolator. |
| NL800 Stimulus Isolator |
A battery powered opto-coupled stimulus isolator with a constant current
output (10 µA to 10 mA full scale in 4 ranges). This unit stands alone for
close positioning to the preparation. |
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Analog & Computational Modules
| NL201 Spike Trigger |
A gated amplitude discriminator for nerve spikes and other events, with
separate outputs for within- above- and below-window spikes. |
| NL253/6 Ratemeter |
Ratemeter's which calculate the 'instantaneous frequency' for a pulse train,
and produce an analog output proportional to the rate. Suitable for heart or
respiration rate (NL253), or neural firing rate (NL256). |
| NL601 Pulse Integrator |
Produces an analog output proportional to the count of input pulses, with a full-scale
of 255, 2550 or 25500 pulses. Manually or automatically reset. |
| NL701 Lin Display |
Produces an output signal which is proportional to the time interval between the last
two input pulses, allowing display of firing interval. A logarithmic version (NL700) is also
available. |
| NL702 Ratemeter |
An averaging type ratemeter but with a fast response to changes of input frequency. Three
range settings of 100, 250 or 500 pulses per minute FS. |
| NL703 EMG Integrator |
An 'leaky' integrator following a full-wave rectifier - ideal for monitoring of EMG activity
levels with 6 switchable time constants. |
| NL705 RMS Integrator |
Computes input power by evaluating the root-mean-square signal level. Six switchable
time constants. Ideal for EMG estimation. |
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Please note that some NeuroLog modules may not be mentioned here, but may be found on
Digitimer's web site.
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The Humbug is a really nifty little device which can seriously clean up your signal
without distorting it.
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 HumBug 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.
- Removes simple 50/60 Hz Sine Waves
- Removes Mixtures of 50/60 Hz Harmonics
- Removes Noise Spikes from Dimmers
- Removes Complex Noise from Flourescent Lamps
- No Waveform Distortion
- No Frequency Loss
- No DC Voltage Shift
- No Signal Attenuation
- No Phase Error
For more information on the Humbug, please see
Quest Scientific's web site.
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For more information and pricing details, please email us.
© Copyright SDR Scientific Pty Ltd 2021
