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LAT.  Light-Activated Trigger and Light-Activated Trigger with Delay*

This trigger operates the reverse of our photogate kits. The output of the light-activated trigger is switched on when light shines on the detector. A laser pointer works particularly well as a light source, since the phototransistor is sensitive to visible light and has a narrow angle of view.

The LAT includes 6 feet of 2-conductor cable. This can be cut into two lengths in order to connect the output to a flash unit and also to move the photo transistor to a location away from the breadboard.

An electronic delay unit may be used with the LAT to achieve timing synchronization. You receive a $1.00 discount when purchasing a LAT trigger with a delay unit.
When purchasing a LAT kit with a breadboard, there is a $1.00 savings over buying a kit and breadboard separately.

LAT  Light-activated trigger kit - $9.00

LAT-BB  Light-activated trigger kit with breadboard - $14.00

LAT-DU  Light-activated trigger kit with delay unit - $15.00
LAT-DU-BB  Light-activated trigger kit with delay unit and breadboard - $19.00
*Customers have reported that when using the delay unit outputs to trigger Canon 430ex and 580ex flash units, the flash unit is disabled after each discharge until the unit is turned off and on again. In order to correct this problem, two 1-kW replacement resistors are included with each delay unit and combination kit. These resistors may be used in place of the 22-kW resistors that lead from outputs 5 and 9 of the 556 timer.

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