2.3 Stand-alone mode (without Doric Neuroscience Studio Software)
The following sections details stand-alone operation of the
LED driver
. For installation of the
LEDFRJ
in stand-alone
mode, see section
2.3.1 Driver operation modes with the stand-alone device
If the light source driver is used as a stand-alone device, 3 modes are available: constant current (CW), external TTL (Ext.
TTL), and external Analog (Ext. Ana). The operating mode is changed by pressing the
Control knob
. The maximal driving
current is set by turning
Control knob
. Use a fast/slow rotation for coarse/fine adjustment. The operating mode and the
maximum driving current setting are independently adjusted for each channel.
Constant current (CW)
Figure 2.3:
Constant Current Mode Driver Signal
When using the CW mode, the user simply sets the driving current applied to the light source. The light source is acti-
vated and an output beam will be visible as long as the driving current is above the minimum driving current (Fig.
External TTL (TTL)
Figure 2.4:
Driver Signal Response to External Source in External TTL Mode
In the External TTL mode, the driver is activated by an input TTL signal coming from an external device. This activation
will follow the TTL pulse waveform. The driving current is set with the control knob, and is constant during each TTL
activation pulse.
Chapter 2. Operations Guide
8
