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General Discussion / need help for power source for levitating aluminium
« Last post by rajheman on September 15, 2016, 09:53:07 AM »
need schematic for levitating aluminum disk of 1 kg as show in the
post was posted in our forum earlier by Giorgos Lazaridis



General Discussion / Re: Schmidt trigger?
« Last post by zofz on September 02, 2016, 12:48:33 PM »
Hi, I cannot see any schematics in the doc?
General Discussion / Free online electronic circuit design tool
« Last post by MaxBlack on August 25, 2016, 06:21:53 AM »
I 'd like to recommend a new free online electronic circuit design tool.
  There are several free EDA tools around and some excellent FOSS tools such as KiCad and gEDA but the reason I thought people might be interested in this one, EasyEDA, is because it has a few twists to it.

  i) it's web based so, with nothing except a bit of javascript to install, it can be used by Linux, Mac and Windows users and  if they have a big enough screen - Android and iOS users too;

  ii) work can be shared and - with a bit of agreement on who saves what, when via a 3rd party instant messaging service - it supports collaboration;

  iii) it has some pretty impressive import and export options such as importing Altium, Eagle and LTspice files and exporting spice netlists and svg, png and pdf files for documentation. It also uses open standard JSON format files internally so it's easy to do some quite whizzy things just using a text editor;

  iv) all use of the tool is free even to the point where the user can download PCB Gerbers and send them off to any PCB supplier;

  v) it also offers a low cost PCB service: PCBs can be ordered directly from within the tool (this seems to be the way the money is made to keep the whole thing afloat);

  vi) it can even be used without registering with files being saved in an Anonymous mode that works a bit like pastebin where files can be retrieved and shared just by their urls.

  It's easy to drive for there are lots of examples on the site and a useful tutorial.

Your projects / Re: Palmsize quadcopter
« Last post by allan on August 05, 2016, 14:37:01 PM »
thanks , if you interested ,maybe you can see  www.pcbgogo.com/f ,really recommend.. ;D ;D ;D ;D ;D
Your projects / DIY gaussmeter
« Last post by vlady_2009 on July 29, 2016, 17:23:24 PM »
I started out making a DIY sheet metal brake for bending salvaged material to fabricate enclosures for various projects, which like many projects, led through various meanders, one of which was a DIY gaussmeter to measure magnetic field strength (the sheet metal brake uses magnets instead of the usual clamps).

The gaussmeter is made from an inexpensive hall effect sensor, and designed to be an attachment/plugin to a multimeter - so doesn't need a lot of components, fancy microcontroller programming etc.

For anybody interested, I've documented the project with full schematic, PCB (for those that want to make a DIY PCB instead of just using perfboard or smilar) and construction notes at the following link:


General Discussion / Re: [HELP] What dose the signal wire do on a servo
« Last post by LastPayLoad0 on July 28, 2016, 20:16:28 PM »
so what would i have to do? Maybe add a controller some how?
(its ok if you don't care to answer
General Discussion / Re: [HELP] What dose the signal wire do on a servo
« Last post by kam on July 27, 2016, 17:49:43 PM »
General Discussion / [HELP] What dose the signal wire do on a servo
« Last post by LastPayLoad0 on July 27, 2016, 01:46:00 AM »
Hello im a noob a servos and i have a store brand (meaning have no controller) so i was wandering if i could basically not use the signal wire for it.
basically i want to change the steering moter (which gets stuck so dosn't even out) out with a servo, but i have no clue what the signal wire dose. So what dose the signal wire do?
Your projects / Re: Palmsize quadcopter
« Last post by kam on July 16, 2016, 09:37:02 AM »
Although this is definitely a PCB manufacturer ad and there will be no follow up, i will let this post online because i really liked it.
Your projects / Palmsize quadcopter
« Last post by allan on July 09, 2016, 06:52:36 AM »

recently DIY a new design.---Palmsize quadcopter
Gald to share with you some of my opinions.

In the control of aircraft flying, there are the following technical difficulties:

First of all, it is not only affected by various physical effects during the flight, but also very easy to be disturbed by the external environment, it is difficult to obtain the accurate performance parameters.

Secondly, the micro four rotor unmanned aerial vehicle is a system with six degrees of freedom, and only four control inputs. It has the characteristics of multi variable, nonlinear, strong coupling and interference sensitivity, which makes the design of flight control system become very difficult.

Thirdly, it is necessary to eliminate the cumulative error by using the gyro to detect the attitude of the object, and how to establish the error model and the cumulative error of the integrated navigation system is an engineering problem.

These three problems are solved successfully or not, which is the key to realize the autonomous flight control of Micro Four rotor unmanned aerial vehicle, which has very important research value.

It is worth mentioning at this point that the pcb board that i bought from a chinese pcb manufacturer--PCBGOGO, the best manufacturer that i had used ,i only cost 10$ for 10 PCS . and I was so impressed by the speed fabricate time and the lead time . recommend !
If you have other better ideas about Palmsize quadcopter  ,i'd like to discuss with you.any opinion will be greatly appreciated.


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