FAST PRECISION LED DRIVER by LM324

The circuit allows a precision regulated drive current to be set to drive an LED, and in response to a TTL level signal, the LED is switched on and off with rise and fall times of less than 500 nanoseconds and less than 7% overshoot. This was designed for biological experiments to study the photo repsonse of cone cells rabbit eyes. This circuit may also be useful in systems that require a stable pulsed light source, such as those that measures light transmission (turbidity and densitomitry insturments, for example) and for the transmission of low speed optical data (to 200 kHz). The components are all easy to obtain and low cost.

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