EOS 8/20 microsecond surge protection - STMicroelectronics - Nightly. LLC - Fabricators/Distributors - Nightly. Radio-Electronics.Com - Nightly. - the design considerations and formulae (formulas) for an LC (inductor capacitor) low pass filter Low pass filters are used in a wide number of applications.
Particularly in radio frequency applications, low pass filters are made in their LC form using inductors and capacitors. Typically they may be used to filter out unwanted signals that may be present in a band above the wanted pass band. In this way, this form of filter only accepts signals below the cut-off frequency. Low pass filters using LC components, i.e. inductors and capacitors are arranged in ether a pi or T network. LC Pi and T section low pass filters There is a variety of different filter variants that can be used dependent upon the requirements in terms of in band ripple, rate at which final roll off is achieved, etc. Simple AlexMos brushless gimbal from Viacopter - RC Groups - Nightly. Like everyone else in the MR community the AutoQuad Team was seeking for a solution for a top notch gimbal control, though the internal camera stabilization of the AQ6 worked pretty well even with cheap gimbal/servo combos.
Spreadsheet for PIDs and other settings for different gimbals/ This video shows the complete setup and tuning process, examplary connected to an AutoQuad FC Thanx to the SBGC project by Alex Moskalenko and the efforts of AQ Team members like Jussi (ViaCopter), Paul (Flyduino), Felix (famous Flyduino NanoWii and UltraESC design) and SebastianJ (Gimbal design) we'll soon have what many desire: an affordable, simple but effective solution for Multirotors - and any vehicle you can think of attaching it to. I'll try to collect some more info about Alexmos' SimpleBGC as we go... Fatshark 600TVL High Resolution FPV Tuned Pan/Tilt CMOS Camera - Nightly. Technology - LTspice Demo Circuits - Nightly. LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators.
LTspice provides macro models for most of Linear Technology’s switch-mode DC/DC converters, op amps, comparators, linear regulators as well as a library of devices for general analog circuit simulation including discretes. Selected Linear Technology devices also have demonstration circuit available for free download. These demo circuits are designed to ensure proper performance and have been reviewed by Linear Technology’s factory applications group. Follow the instructions below to run the demo circuits in LTspice. Step 1. Has accessories for FPV, UAV, Ham Radio, Robotics, & more! - Nightly. Trm-xxx-dp1203.pdf - Nightly. Advanced Navigation - Nightly. RC Groups - View Single Post - APM 2.5 / Ardupilot Mega / RCTimer Arduflyer Discussion Thread (updated 5/8/13) - Nightly. Quote: Is that the 6 pin socket on MimOSD with GND GND +5V RX TX DTR My current limiting 5W 12V globe would have limited total current available from the Lipo to 0.4A and the voltage available to the UBEC would also have been lowered substantially in the process Without my current limiting globe your UBEC would have supplied Maximum current, maybe even failing internally from current beyond its Maximum rating and then supplying full Lipo Voltage and Current.
You do need to test that UBEC to make sure it is now delivering correct Voltage. Which UBEC did you use ? Did the UBEC survive ? Did you have UBEC on Inputs with JP1 removed ? That 6 pin connector PCB layout on MimOSD was done by a well meaning ill informed Amateur who did NOT appreciate nor understand the lengths FTDI went to in designing that 6 pin socket to make it safe from mistakes like yours. Since I can easily make the same mistake, I made my MimOSD safer. Cut 2 traces on the front of PCB Cut 1 trace on the back of PCB. Batsocks - AVR ISP Header Pinouts - Nightly. There are 6-pin and 10-pin versions. The pinouts are as follows; 6-way header 10-way header For those that are struggling with which way is up (it's one of those things that once you know, you never question again), pretend that the diagrams above are plan-view photographs, and the pins are coming out of the screen towards you.
You'd connect a cable by pushing it on towards the screen. Protect MOSFET Driver From Reverse-Battery Connection. Mar. 17, 2003 Mark Cherry | Electronic Design It's vital that MOSFET power-switch drivers be protected from a reverse-battery connection.
A small rectifier diode can shield against reversed batteries. But that approach is generally unacceptable for systems whose battery life is crucial. For a 6-V battery, the diode's forward voltage drop (0.6 to 0.7 V typical) produces a constant power loss of approximately 10%. This loss increases with dwindling battery voltage. The approach shown in the figure is an improvement over single-diode protection. Connecting a positive battery voltage to the drain of Q1 produces forward bias in its body diode, which clamps the source voltage one diode drop below the drain voltage. RSSI on Frsky V8FR-II - Nightly. Has accessories for FPV, UAV, Ham Radio, Robotics, & more! - Nightly. This compact supply filter helps clean up dirty DC power that often causes lines in wireless video images. The filter is an LC type that uses large value inductor and capacitor components. Their values are robust enough to remove moderate amounts of power supply noise.
The filter reduces DC-DC switcher supply ripple and helps clean noisy power from a shared battery. For example, if your robot or R/C model's main battery also powers the video camera and A/V transmitter, then this LC filter can help reduce the video "noise" that may appear when its electric motor is running. This filter is used to reduce ripple noise and similar power supply nuisances. Kalman filters: The on-going “biography” of an idea. One of my favorite new books and one I constantly go back to is James Gleick's new opus titled “ The Information .
" It is about information theory and Shannon’s contributions, among others, to understanding its implications not only to engineering but to any aspect of research into the natural world. While it is technically rough going sometimes, what brings me back again and again to reading it is that it is “ the biography of an idea ,” as one reviewer said. While he does not spare the reader by dumbing down the complex technical issues, Gleick is able to interweave this with the intellectual exploits and personal experiences of those who over the last several hundred years have contributed to our understanding. Coincidentally, as I have been reading it, I have also been making my way through “ The normal distribution ,“ Jack Crenshaw’s most recent Insight blog on the importance of the Kalman algorithm in every aspect of electrical engineering and embedded systems design. FET Supplies Low-Voltage Reverse-Polarity Protection.
Tracking planes for $20 or less. My new favourite toy is a cheap $20 USB TV tuner. Batsocks - AVR ISP Header Pinouts - Nightly. Advanced Power Switching and Polarity Protection for Effects - Nightly. Copyright 1999 R.G. Keen All rights reserved. If you're an effects builder or repairer, you know by now that it's a good idea to protect the circuitry in the effect from the consequences of a reversed battery. While many older effects can withstand a momentary reversal, some more modern components can be damaged if you accidentally touch the battery contacts the wrong way during replacement.
Sometimes this is subtle damage. For instance, everyone pretty much knows that CMOS and some opamps can be killed by reversing their power supplies. Ok, so reverse polarity is a Bad Thing. A cleverer arrangement is to put the diode in parallel with the effect so it's reverse biased by the normal polarity. Rtl-sdr – OsmoSDR - Nightly. DVB-T dongles based on the Realtek RTL2832U can be used as a cheap SDR, since the chip allows transferring the raw I/Q samples to the host, which is officially used for DAB/DAB+/FM demodulation.
The possibility of this has been discovered by Eric Fry (History and Discovery of RTLSDR). RC Groups - View Single Post - APM 2.5 / Ardupilot Mega / RCTimer Arduflyer Discussion Thread (updated 5/8/13) - Nightly. Current Sensing Circuit Concepts and Fundamentals - 01332b.pdf - Nightly. RC Groups - View Single Post - APM 2.5 / Ardupilot Mega / RCTimer Arduflyer Discussion Thread (updated 5/8/13) - Nightly. Pay attention, here comes an interesting finding which may not mean a lot to some. NORMALLY - 3DRradio does NOT work if USB is connected to ArduFlyer.
However there is a way to power ArduFlyer using a USB cable AND have 3DRadio working. Trick is to use the USB cable to only supply 5V power and NOT make an actual USB connection. How do you achieve that ? Connect the other end of the USB cable to a phone charger with a USB connector outlet like this one from HTC which can supply 5V 1A, ArduFlyer only needs about 250mA 3RDadio works, no need to remove props or use a different BEC and Lipo, normal UBEC and ESC can all remain connected quite safe. It may also be useful when tinkering with ArduFlyer in or near a car or any battery, as there are car USB chargers that output 5V 500mA with input rated at 12V to 24V.. Having a short extension USB cable built into the frame seems like a good idea. RC Groups - View Single Post - Installing Rctimer C&V Sensor 90A to ArduFlyer 2.5 - Nightly. There is a lot of information in this lengthy blog, please read it all, possibly read it more than once, do not start to apply any of the information before you fully understand it all and it actually makes sense to you, if there is anything you are not sure about, ask first, it can save a lot of time, expense and frustration.
My post #6 with up to date links for APM 2.5/ArduFlyer 2.5 is here Obviously you are measuring large currents, you do need thick conductors capable of handling those large currents soldered to the Rctimer Current & Voltage Sensor 90 A [ CS ] board. We are measuring the current flowing through the thick red lead from the Lipo connector to the Power Distribution.. The next choice is up to you, there is no need to use plugs and sockets, there is no good reason why the CS cannot be incorporated permanently into the lead between Lipo connector and Power Distribution. The contents of the CS The CS board in close detail +IN connects to the Lipo battery connector. Tracking planes for $20 or less. Current Sensors - Nightly. RC Groups - View Single Post - APM 2.5 / Ardupilot Mega / RCTimer Arduflyer Discussion Thread (updated 5/8/13) - Nightly. APM2RC - arducopter - Arduino-based autopilot for mulitrotor craft, from quadcopters to traditional helis - Google Project Hosting - Nightly.
Wiring up the APM board is easy. Just connect your RC receiver to the Input side (using the special cables that came with your quadcopter kit, or just any female-to-female cables). And then plug the signals cable from your power distribution board to the Output side. Please note the illustration Below highlights a (TYPICAL) installation. It contains optional equipment including a Camera Gimbal and a Battery Monitor and it utilizes an ESC wired "Y" power connection rather than the power distribution board common to many MultiCopters. WARNING:The diagram 'Typical QuadCopter Layout shows the gimbal servos connected and powered by the 5V coming from CH10/CH11. 3D Robotics APM 2.5+ Autonomous Flight (Part 2 – Setup) » Odd Copter - Nightly. In this post I will go through the steps I followed to setup my APM2.5+ to fly in a quadcopter X configuration to fly an initial maiden flight.
I recently converted my Easy DIY Quadcopter to use the APM2.5+ and described that process in Part 1. Changes Click to Enlarge. Nightly.