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The
NL800A Stimulus isolator is a compact source of constant current
stimulation, however, it requires an input voltage (provided by
the NL510 Pulse Buffer or NL512 Biphasic Buffer) to control the
output pulse duration and amplitude. As each channel of
stimulation requires no more than one module bay to be used, it us
possible for the NeuroLog system to become a versatile
multi-channel or biphasic stimulator. If repetitive stimulation is
required, the NeuroLog System Pulse/Period
Generator and Digital Modules can
take care of this.
NL510
- Pulse Buffer |
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The NL510
converts TTL input pulses into output pulses of 0 - 10V or
input drive pulses for the NL800/800A Stimulus Isolator (below). Precise output amplitude control is
determined by a 10 turn dial. The voltage output can
make this a suitable stimulation device for preparations
which require a non-isolated, LOW voltage stimulus.
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NL512
- Biphasic Buffer |
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The NL512
provides an interface between any biphasic signal
generator and two NL800/800A Stimulus Isolators (below).
This combination produces a flexible biphasic stimulator,
which can be controlled by a biphasic analogue waveform. Stimulus amplitude is
controlled precisely by "current out for voltage
in" circuitry.
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NL800A
- Stimulus Isolator |
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The
NL800A is a battery powered, opto-coupled isolator
(replacing the NL800). It has
a constant current output, with very high output
impedance, making it suitable for stimulation through
microelectrodes as well as with gross electrodes. Normally
driven from the NL510 or NL512 buffer modules, its output
current is either set by the 10-turn control on the NL510,
within the output range set by the switch on the NL800A or
by the amplitude of the voltage waveform applied to the
NL512 (or directly to the NL800A). Output pulses have the same timing as the
input pulses (2 micro-seconds to 30 seconds output pulse
width). The
NL800A is supplied with a set of batteries, a pair of 1mm
output plugs and heat shrink sleeving.
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