R/C Blogs - RC Groups
Posted by Jack Crossfire | Today @ 01:24 AM | 102 Views
In what became an epic bodge, the 5 year old headset monitor was finally replaced with a much smaller version. The original design required a large inductor to isolate GSM noise. That was no longer necessary for LTE phones. The original design ganged 2 op amps to drive the speakers in mono. The new design drives the speakers with 2 op amps in stereo.


The original design used cascaded 10x amplifiers in the preamp. The new design uses a single 100x amplifier because 1 op amp had to be bodged for isolating the phone. As in the original design, a voltage follower is required to keep the phone from feeding into the preamp, but the reason wasn't written anywhere. It wasn't to isolate GSM noise.


The original design regulated 12V down to 5V. The new design uses unregulated 4.2V from a battery which lasts 24 hours. The standby current is only 5mA. Peaks get it up to 20mA. It took a lot of bodging to adjust the phone volume. The 5k's double the phone's volume, giving the phone's internal volume control enough room. The only adjustment is the microphone volume.


The decision was made to have the monitor permanently in the headphone line. The headphones were never used for anything else.


There was an idea to use digital mixing in a microcontroller, but this required a lot more parts. The lion kingdom inherited a lot of AD8604's from the day job. These are insane rail to rail 8Mhz op amps.
Posted by Ryno vxl | Today @ 01:15 AM | 124 Views
So i have a vxl rustler i run a venom 5000 35c 11.1v lipo battery from time to time and a 7200 mah 131amps 7.4v 90c constant lipo my question is could i buy the venom pro duo charger to charge both batteries? Also im looking for a good quick charger for 2s 3s lipo any suggestions.. Thanks and looking forward to a reaspons
Posted by xinte | Today @ 01:02 AM | 129 Views
Help!Need reviews for this drone
Here is the 450 DIY RC Drone,https://www.xt-xinte.com/Full-Set-RC...r-p134024.html
Seek reviews for this drone,I can send the drone for free.
Welcome to contact me for cooperation,thanks!
Posted by day o | Today @ 12:25 AM | 170 Views
I "just" got my 210 back in the air, thanks to a replacement HGLRC F4 V5Pro FC from Pirofliprc. My wife signed us up to host Thanksgiving for her family this year, so we have a ton of people over. I decided to give them all a ridealong and tried to get too fancy or something. I think my battery slipped out after a front flip, and that may have dragged the whole thing down. Anyways, I broke an arm. 4mm 3k carbon doesn't break that easily, and I can attest that I was really moving at the time. And I may have killed a lipo. I have fiberglass poking out. The cells are all fine, but something tells me that she's not going to survive another crash. All this after I just got her back in the air too. With my Leader 120 being down, I'm now left with just brushed micros. I think it's time to start another build
Posted by xinte | Today @ 12:18 AM | 160 Views
Professional JMT 2.4G 8CH 310 330 360 Mini RC Quadcopter ARF RTF Unassemble DIY Drone FPV Upgradable with Radiolink Mini PIX M8N GPS Altitude Hold

https://www.xt-xinte.com/2-4G-8CH-31...d-p435660.html

Package included:
F02471-M F330 Quadcopter:
F330 Frame Kit * 1,
1400KV A2212 10T Brushless Motor * 4,
Simonk firmware 30A ESC with BEC 5V * 4,
8045 Plastic CW CCW Propellers * 2,
Radiolink MINI PIX + MINI GPS * 1,
GPS Folding Antenna Mount * 1,
Radiolink T8FB Remote controller * 1,
11.1V 2200MAH 25C Lipo Battery * 1,
B3PRO Charger * 1,
Buzzer Alarm * 1,
Accessories bag * 1

F14892-N 360mm Quadcopter:
X4M360L Glassfiber Frame Kit * 1,
920KV CW Brushless Motor * 2,
920KV CCW Brushless Motor * 2,
Simonk firmware 30A ESC with BEC 5V * 4,
8443 Carbon Fiber Propeller Self-locking * 2,
Radiolink MINI PIX + MINI GPS * 1,
GPS Folding Antenna Mount * 1,
Radiolink T8FB Remote controller * 1,
11.1V 3300Mah 25C Lipo Battery * 1,
B3PRO Charger * 1,
Buzzer Alarm * 1,
Accessories bag * 1

F14891-M 310mm Quadcopter:
X4M310L Glassfiber Frame Kit * 1,
1400KV A2212 10T Brushless Motor * 4,
Hobbywing XRotor 20A ESC * 4,
8x4.5 2-Blade Propellers * 2,
Radiolink MINI PIX + MINI GPS * 1,
GPS Folding Antenna Mount * 1,
Radiolink T8FB Remote controller * 1,
11.1V 2200MAH 25C Lipo Battery * 1,
B3PRO Charger * 1,
Buzzer Alarm * 1,
Accessories bag * 1


Function:
1. Forward/backward,Sideward flight,Turn left/right,Up/down,Hover,One Key Taking Off,Self-...Continue Reading
Posted by genstattu-acepowling | Yesterday @ 09:52 PM | 322 Views
2200mah 25c 3s 18.9$ Now 12.4$

5000mah 50c 2S Hardcase 36.99$ Now 29.5$

1300mah 4s 95c
37.65$ Now 25.5$

16000mah 6s 325$ Now 260$

1550mAh 4S1P 14.8V 75C 33.36$ Now 23.19$

2200mAh 22.2V 45C 6S1P 45.9$ Now 34.4$

5300mAh 11.1V 50C 3S1P HardCase 58.99 $ Now 44.2$

650mAh 4S1P 75C 15.69$ Now 14.2$

1550mAh 4S1P 14.8V 75C 33.36$ Now 23$

22000mAh 22.2V 25C 6S1P 461$ Now 392$
Posted by old4570 | Yesterday @ 08:40 PM | 441 Views
There are some really good points to this transmitter and a few negative points .

1) Even though it is a feature packed Tx , it is cheaply made
2) And the cheapness shows as soon as you begin to use the transmitter ..

I will start with the gimbals as a lot of people have become very gimbals demanding . I can understand that when you pay a thousand dollars or more you pretty much want perfection , especially from the gimbals . Recently it would seem folks are demanding more from the budget transmitters and I have to say it looks like some manufacturers are coming to the party ( FrSky for one ) .

When I first flew the XK K110 it was very mushy around neutral ( center ) stick . The reason for that is that there does appear to be a dead zone right around center stick . So you can try and make minor adjustments and nothing really happens .

XK transmitter (0 min 52 sec)


I am not sure if you can tell in the video , but the gimbals are a lot like say ones in a transmitter where the gimbals have worn . ( This is a new Tx after all )
This does tend to take away from the ability to be more precise in confined spaces and for me resulted in some bumping and scaring on the rotor blades .
At lower rates the transmitter just did not cut it for me . At the moment I am running 100% and no expo for the lower rate and 110% and no expo for the higher rate .
Lowest Rate setting = 0
Highest Rate setting = 125

Expo looks interesting :
You have both positive and...Continue Reading
Posted by Miami Mike | Yesterday @ 08:18 PM | 512 Views
A "fuel gauge" for your telemetry screen to display your LiPo pack's charge state as a percentage of full charge.

For OpenTX Version 2.1.9, adaptable to Version 2.2.

Here's a "fuel gauge" setup for your Taranis to display your flight battery's state of charge as a percentage, beginning at 100% for a fully-charged pack and decreasing as you consume battery power. It requires a current sensor, such as a FrSky SP-40A - Smart Port 40 Amp Sensor or a FrSky SP-150A - Smart Port 150 Amp Sensor.

You'll be able to add alarms and voice announcements that trigger at specific charge states, or at regular time intervals, or each time the charge state decreases by a certain amount, so that you'll get readings at, for example, 100%, 90%, 80%, etc. You'll also be able to bring up announcements whenever you want them by flipping a switch.

This setup will retain the battery state between flights even if you turn your radio off, so it incorporates a switch to reset the charge state to 100% when you change packs.

It's configured for OpenTX Version 2.1.9 but should be compatible with Version 2.2. If you have any questions, suggestions, requests, or find that something has to be done differently for Version 2.2, please post in the comment section below.

Begin by configuring the sensor on the Telemetry page if you haven't already done so:



The Curr line should be created automatically with the Discover new sensors function. You can then add the mAH line anywhere on...Continue Reading
Posted by QuadifyRC.com | Yesterday @ 07:53 PM | 452 Views
Just finished updating my discounts/coupons page with what I consider to be the best quadcopter Black Friday deals. Confirmed all awe working as at time of posting. Good time to buy if you are looking

http://discounts-coupons.quadifyrc.com/


Posted by DismayingObservation | Yesterday @ 06:00 PM | 573 Views
There are so many fun, albeit seasonal, goodies which only seem to appear at Christmastime.

This happens to be one of them, but it’s so much fun that it would be relatively simple to convert it to year-round use. That goodie is the JJRC H67 Flying Santa Claus quadcopter from GearBest.com. Jolly old Saint Nick is represented by a clone of a LEGO mini figure which either stands or sits atop the quad itself.

The real buzz surrounding this little Christmas confection is the fact that it’s based on the Eachine H011 quad, itself a prime candidate for conversion into a Tiny Whoop. Doing a “Claus Conversion” to the H67 is just as easy since its 7mm coreless motors provide the extra oomph needed to fly the roughly 40-gram Santa “brick figure.” The cost is incredibly low as well, coming in at well under twenty bucks ready to fly.

At the time of this writing, a "flash sale" is underway which lowers the cost to only US$13.89 with free shipping to the US via unregistered air mail.

What makes this a Christmas item isn’t so much the removable Santa Claus figure so much as it’s the first RTF quad I’ve ever seen which plays music.

Christmas music. Loud, tinny Christmas music. Two songs, ad nauseum. “Jingle Bells” and “We Wish You a Merry Christmas” sung by a children’s chorus. There’s no way to switch it off short of desoldering the sound module’s power leads atop the...Continue Reading
Posted by Absaroka | Yesterday @ 05:30 PM | 588 Views
Picked up a sport cub and tricked it out as a USAAF FAO out of Lawton Field circa 1940.
Posted by xplaneguy | Yesterday @ 04:33 PM | 702 Views
This was very special for me. It all started with a Cox PT-19 more than 40 years ago.
Evelyn's first Cox PT-19 flight (1 min 39 sec)

Posted by vulturetec | Yesterday @ 03:41 PM | 697 Views
Scratch building a Gentle Lady. Trying to make it a "quick build" project over Thanksgiving. We'll see!

The plans are floating around the internet but I have an original RCM set and a set from a kit around here somewhere. The .pdf-based plans are kind of rough, but dimensionally fairly good and usable for creating parts. As long as everything fits it isn't overly critical anyway.

Click to enlarge...


Day one & two, weekend prior to Thanksgiving - worked on drawing up the parts in CorelDraw. I already did the basic rib layout a while back in Profili/Wing Dev but tweaked them for the build.

Click to enlarge...


Click to enlarge...
...Continue Reading
Posted by Ian C | Yesterday @ 02:25 PM | 739 Views
A few of my RC videos...

Dan Cummins / Mount Laguna (1 min 41 sec)


4-meter ASH 26 Maiden Flight (4 min 9 sec)
...Continue Reading
Posted by Woodinthesky | Yesterday @ 01:17 PM | 819 Views
Hey guys. We just turned on our sale button on the website www.fpvearbuds.com for Black Friday check it out 20%off everything store wide use code black20off at checkout to receive your discount happy thanksgiving!
Posted by KristofferR | Yesterday @ 01:13 PM | 819 Views
A while ago when I picked up a used TX from eBay it turned out that the guy was moving abroad. He was emptying his house and tried to sell me a lot of RC stuff, some very tempting.

But I decided long ago to only buy hobby-stuff I had a personal interest in and nothing just for potential profit - I am a good seller and here was definitely possibilities. But I quit glow engines long ago and vintage RC 1/8 track was never my thing. I ended up buying a box of tools and small parts and an indoor plane in hideous condition. I have never flown indoor!

Google revealed itís a Crazy Sukhoi, designed by Claes Meijer and sold by Autopartner. At home, I was almost considering to break it for parts but cleaned it up, spent a few hours with UHU Por and Blenderm and put it aside for a week. Well, its battered but it will fly again! Current weight is 123g without prop, batt and rx.

Perfect opportunity to try indoor and if I like it I can wear this one out.
Posted by FPV.Model | Yesterday @ 11:36 AM | 930 Views
10% oFF Black Friday & Cyber Monday
Free Gifts available.
https://www.fpvmodel.com/2017-Black-Friday.html



...Continue Reading
Posted by UpNup | Yesterday @ 09:06 AM | 1,124 Views
Things change when you see the original. Seeing the only existing Ford Flivver 268 was a treat. You know you're working hard at a build when you travel several hours to see the original. The Ford Flivver is on display at the Henry Ford Museum in Dearborn, Michigan. The museum is very well done and worth the $22 ticket plus six dollar parking.

What changed for me was the detail that doesn't exist in the Williams Bros. plastic model and in the RC Modeler June 1990 article and plans. Dereck Woodward built the 1/5 scale plans I'm using off of the plastic model. For instance, the plastic model shows a gas cap in front of the windshield. The plans don't have it. But the real FF has a gas cap and some kind of other port, probably for oil. There were many other details that I noted and placed as captions in the photos.

Anyone building scale should certainly consider viewing the original. You'll have limitations like I did. Couldn't measure anything. Couldn't climb underneath or peer into the cockpit. But there is enough detail to keep me busy on this build....Continue Reading