If you don’t have other 5V or 3. But I want to build the driver myself because all the drivers I have seen online are expensive. Being that this circuit will be used with a microscope, it may eventually be operated by touch alone. Except the forward voltage from three LEDs in series can vary quite a bit and hence the current as well. Your dead on that is where the brick came from T40 to be exact I think. Originally Posted by thomast
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The schematic for this LED driver is similar to many that can be found on the web.
If the power supply voltage is close to the voltage across the LEDs, the linear regulator can be more efficient For a microscope, light must go up….
To try to give a quick answer, let me identify the different scenarios: Press both buttons and the LED comes on full bright. The time now is The direction of the light also depends on the style of microscope ie; transmitted vs reflected light.
Easy CAT LED Driver
On the topic of regulators: Previous Step Intro 1 2 3 4 5 6 7 Next Step. Notify me of new posts via email. And then there’s the issue of the voltage transients that can be on the battery bus!
In my job, the assumption is that a 12v battery can be anywhere between 9v and 18v. A lot of it depends on the value of the power supply and the voltage across the LEDs.
Simple 10 Watt LED driver is Hot Stuff
I will need a driver to power a single led and a driver to power several in series. They come to me looking for a quick, simple answer.
I had not seen this one. My back of napkin calculations indicate about 3W on the higher side of things.
This is not to say that the CAT can not be efficient. I have been looking around for an led driver design. You would need external inductors to make it work, and adjusting the current would be more difficult than a simple current mirror.
The final mounting is horizontal to mate up to the fiber optic whip from my scope. If you don’t have other 5V or 3.
Simple 10 Watt LED driver is Hot Stuff | Hackaday
Being that this circuit will be used with car4101 microscope, it may eventually be operated by touch alone. It provides a fairly steady current and is relatively insensitive to LED variations. Unlike most switching drivers buck, boost, etcthe CAT needs a low external parts count, no inductor, and requirements for trace length and placement of external components are much more lax.
Anyone know where I can find any schematics? Adding an optional 10K Ohm pullup resistor to the board, and some sort of inverting logic not on this board makes it compatible with the TLC Assuming an average LED voltage of 3.
If the fins of the heatsink were facing up instead of downit should be able to stay reasonably cool even with passive convection, linear or switchmode regulation.
Last edited by thomast77; at Flashlights and Parts WTS: Except the forward voltage from three LEDs in series can vary quite a bit and hence the current as well.
Easy CAT4101 LED Driver
Acknowledgments, Credits, and Bibliography. Never gets above room temp even after hours of running. Wow, that thing is incredibly over-engineered.