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 what it is 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 span class news dt 21 11 2012 span nbsp 0183 32 what it is 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 p div class b factrow b twofr div class b vlist2col ul li div author nooruddeenzangi div li ul ul ul div div div li i plan to build a led driver.

that can pulse a high power led 3w down to the 100s of nanoseconds pulse regime yet also allows longer pulses up to 100ms should be possible the led should be driven off a ttl gpio signal i am using an lm324 and three tip122 transistors to drive three 40v 40w led s the problem i am having is the led s don t shut of all the way a very dim glow remains if i use only one op out of the four on the chip and one transistor the led turns off properly if i use three of the four op s the led s do not turn off the main brain of this line follower robot is lay behind the lm324 quad operational lifier from national semiconductor the dual in line lm324 packages contains four identical op s and is specially designed to operate as an analog device p div div li





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