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Comments by Claire
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New adjustable voltage regulators with multi-turn fine adjustment
- 11 January 2019Hi, Costyn.
You definitely should never connect the output of this regulator to another source when the regulator is on. The board does not include any protection from power flowing back into the regulator, and in generally two regulated power sources will likely fight each other if directly connected. If you need to do something like that, I recommend looking into ORing circuits.
-Claire
New MOSFET-based power switches
- 9 January 2019Hi, Tony.
It is good to hear that you like the slide switch design; thanks for the feedback! You could just remove the LED or cut the trace between its bottom pad and the bottom pad of the resistor to the left of it (when looking at the board with the switch on the bottom edge).
-Claire
New product: Breakout Board for microSD Card with 3.3V Regulator and Level Shifters
- 19 November 2018Hi.
High-speed buffer ICs are used for the level shifting, so the board should handle high-speed SPI signals without issue. You can see the level shifting circuit in the schematic of the SD breakout board at the bottom of its product page.
-Claire
Custom Mini Sumo robot
- 25 July 2018Hi, Jeff.
This blog post about creating a mini sumo ring might be helpful. We like to use the Challonge tournament bracket generator for our LVBots competitions, and find it convenient to use a 10 cm x 10 cm sizing box to qualify the robots. We laser cut a few boxes out of acrylic, but wood or some other material would probably work just as well.
If you have any other questions about how we organize our competitions, I would be happy to answer them.
-Claire
New adjustable voltage regulators with multi-turn fine adjustment
- 2 July 2018Hi, Patrick.
Thanks for your feedback! Adding a low voltage indicator LED and circuit would add to the current draw and size of the board, so I am not sure the trade offs would be worth it for a general-purpose regulator, but we will keep it in mind. You could also add a circuit like that externally to the regulator's VIN or EN pins. If you have a high-volume application for such a regulator, please let us know, and we can probably make it for you.
-Claire
New Products: TB67S249FTG and TB67S279FTG Stepper Motor Driver Carriers
- 15 June 2018Hi, tedder
Thanks for the suggestion! We are looking into it.
-Claire
New product: G2 High-Power Motor Driver 24v13
- 23 April 2018Hi, tarball.
A quiescent current of 38mA seems a little high, but it is probably fine. I do not understand what the other part of your question is asking. If you are having trouble with your G2 High-Power Motor Driver or are looking for more in-depth specifications, I suggest posting on our forum, which is a better platform for those things.
-Claire
New Product: 5V, 5A Step-Down Voltage Regulator D24V50F5
- 21 March 2018Hi.
At 36V in, the output current limit is just under 2.5A. The temperature levels off at about 140C with the inductor being the hottest part. The inductor's ripple current is high, but not higher than the output. By the way, we have some more characterization available on this similar product:
https://www.pololu.com/product/2866
That board has a 1.5uH inductor on it, and with 36V in and 2.5A out the RMS ripple of the inductor is about 1.35A.
-Claire
New Product: 5V, 5A Step-Down Voltage Regulator D24V50F5
- 8 March 2018Hi.
There is no single optimum inductance for all operating points, and in general, we need some balance of inductance, size, resistance, etc. for boards like ours that are intended to work over a wide range of operating conditions. We did lots of testing with that regulator and Micrel's evaluation board (which uses a 1.5uH inductor) to find the best values for all of the components within the constraints we were working with.
-Claire
New MOSFET-based power switches
- 8 March 2018Yes, adding a 10k pull down sounds like it would do the trick.
-Claire