Ray Tracing
Test Rig
A multimeter is attached to the driver's positive current output and output return to measure current that will be supplied to the diode (leads on the left). An adjustable, regulated linear power supply is attached to the driver's v+ power input and ground connections (leads on the right). A cell phone wall wart rated at 5V 180mA (measured at 5.3V) was pressed into service to supply the modulation input voltage. The driver requires the interlock connection to be closed, but for some reason, I connected it to ground. We fired it up with 7.1V at ~100mA and got no current out. We were successful in illuminating a red LED. We double checked our connections. We sat around, offering "hmmmms" and "maybe's" and I reread the driver's documentation which clearly indicates an interlock connection to V+.
Doh!
I'm going to blame it on being distracted by my surroundings...
Test Rig
A multimeter is attached to the driver's positive current output and output return to measure current that will be supplied to the diode (leads on the left). An adjustable, regulated linear power supply is attached to the driver's v+ power input and ground connections (leads on the right). A cell phone wall wart rated at 5V 180mA (measured at 5.3V) was pressed into service to supply the modulation input voltage. The driver requires the interlock connection to be closed, but for some reason, I connected it to ground. We fired it up with 7.1V at ~100mA and got no current out. We were successful in illuminating a red LED. We double checked our connections. We sat around, offering "hmmmms" and "maybe's" and I reread the driver's documentation which clearly indicates an interlock connection to V+.
Doh!
I'm going to blame it on being distracted by my surroundings...