My back of napkin calculations indicate about 3W on the higher side of things. The final mounting is horizontal to mate up to the fiber optic whip from my scope. No one should use a linear law for a dimmer. Image resizer by SevenSkins. The power in a resistor is the current squared, times the resistance. But everybody do that:

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This pin uses a small amount of power.

Email required Address never made public. Dax there are plenty of cheap chips that with a couple of extra components can include current limiting.

Easy enough to update the step levels in firmware. After that, I’d recommend a good heft TVS transient voltage suppressor diode to clamp the positive transient voltages. Citing the Original Article.

Simple 10 Watt LED driver is Hot Stuff

Except the forward voltage from three LEDs in series can vary quite a bit and hence the current as well. 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 This thread is sort of turning into one of my answers. Sent from my Nexus 4 using Tapatalk 4 Beta.


I honestly don’t know how they can sell them so cheap including shipping? This also means that the cost to build them are also lower.

A lot of it depends on the value of the power supply and the voltage across the LEDs.

Easy CAT4101 LED Driver

This is not to say that the CAT can not be efficient. Fill in your details below or click an icon to log in: A driver can be better for many reasons, but you may not care about any of them: I have been looking around for an led driver design.

Something like the two transistor regulator would be my preferred solution, or maybe a tweak of the CAT regulator. 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. The preferred method is to set the maximum LED current you want and that your LED can handle indefinitelyand then forget it!

Then add some capacitance to attenuate the assorted noise that is on the bus.

You are commenting using your Facebook account. Two of the largest trade-off of not using a switching driver are efficiency and flexibility.


And then there’s the issue of the voltage transients that can be on the battery bus! Learn how your comment data is processed.

But I want to build the driver myself because all the drivers I have seen online are expensive. That depends on what sort of power supply he has.

Easy CAT LED Driver

For example, imagine that you have a volt supply and you connect volts worth of diodes to it. On the topic of regulators: From the datasheet, the minimum and maximum voltages are 3. You are commenting using your WordPress. White LED lumen tests. This is called low side control, as the control device is on ld lower voltage side.

I do have some 5v Wall Warts.

The eye light sensitivity is not linear but sort of logarymic http: Your dead on that is where the brick came from T40 to be diiy I think. Will have to give that a try sometime.