Reg.jpg (21.27 KiB) Viewed 146 times Qpass controls current to the load, based on current that comes in through Rbias. Qreg compares the voltage at the center of the Rf1-Rf2 voltage divider to the reference voltage. It allows more current from Rbias to reach Qpass if the output voltage is too low, and steals bias current from Qpass if the output voltage is too high. If the voltage across Rsense rises far enough to turn Qlimit on, that will also steal bias current from Qpass. If you don't need voltage regulation, you can eliminate Qreg and the Rf1-Rf2 voltage divider, and leave Rbias, Qpass, Rsense, and Qlimit to control the current. You do lose a couple volts between Vin and Vout with that kind of design. - added mousewheel support in the console: wheel to scroll, ctrl+wheel to scroll faster, shift+wheel to scroll history. This is the v1.32 final point release for Quake 3 Arena and Q3A: Team Arena. 3 percent patch. Short List of Changes in 1.32: (see readme for complete list) General: - new network protocol, 68 - network code: improved fragmented messages handling map change while client loads map no longer causes an 'Invalid.PK3' error map_restart while client loads map no longer causes a reload fixing donedl being ignored after autodl if map_restart'ed - the demo command has a list of compatible protocols, it will loop through 66 67 68 you can do '/demo four' and it will try four.dm_66 four.dm_67 four.dm_68 or you can explicitely give a '/demo demoname.dm_??' Simulated Rocket Flight with Raven Altimeter - The Raven Altimeter is from Featherweight Altimeters www.featherweightaltimeters.com. Not shown in. ![]() There are designs with less voltage drop, but they're more complicated. There are also circuits that require less voltage across Rsense, but then you get into traeoffs between headroom and accuracy. For the design above, Qlimit will turn on when the voltage across Rsense is about 0.65v, and to get that, the value of Rsense needs to be 0.072 ohm. When you multiply the 0.65v by 9A you get 5.85W, so you'd need a hefty sense resistor. If you dropped Rsense to 0.01 ohm, you'd only lose 90mV across Rsense before the current limiting kicked in, and the power dissipation would be about 0.8W. ![]() Portable AltimeterAltimeter For SaleYou'd need a very accurate sensing circuit though, because 1mV of change across Rsense would mean 100mA difference in the current. Any noise on the output voltage would play havoc with the current limiting. A much simpler option would be to install a fuse, if you can live with the power cutting completely in the event of a spike. Posts: 47423 Joined: Thu Feb 11, 2010 2:51 pm. Adafruit_support_mike wrote:A resistor only limits current if you hold one end of it at a fixed voltage. If the board you're using doesn't have a regulator to do that, you'll just get a voltage spike along with the burst of excess current. Thank you so much for help! Raven 3 AltimeterI should mention now that I am using this to power various components of my aircraft (high-power rocket) including the altimeter. The Raven 3 altimeter can be powered by any DC source from 3.8v to 16v. The Atas distribution board has regulators. Since I only want to limit current, does this mean that since I will have a fixed voltage through the board that I can indeed install only a resistor to either pos+ or neg- lead to the altimeter from the distribution board?
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