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Showing content with the highest reputation since 07/21/2017 in all areas

  1. 2 points
    Illegal content (ebook/magazines/software) will be deleted without any notice. Thanks
  2. 2 points
    Calm down people. It is not Mixos's fault, if it is against the law he has to remove the content. This site is very good for asking electronic related questions, I have yet to find a better one.
  3. 1 point
    This is a question always been asked so I try to make this list to cover as many pcb manufacturers as I can. This is a listing of websites making PCBs and also may including PCBAs. I will try to update the infomation now and then. http://www.pcbway.com/ -$5!!! http://www.pcbgeek.com/ http://www.sfcircuits.com http://expresspcb.com/ http://www.apcircuits.com/ http://www.10pcb.com/ http://www.goldphoenixpcb.com/ http://batchpcb.com/index.php/Products http://www.pad2pad.com/index.html http://www.pcbcart.com./ http://www.4pcb.com/ http://www.pcbfinpo.com/ http://www.sunstone.com/ http://www.pmsnewzealand.com/ http://www.ezpcb.com/ezpcbweb3/index.php http://dorkbotpdx.org/wiki/pcb_order http://pcbconnect.com/index.html http://www.screamingcircuits.com/Order/ http://www.pcborder.com/site_new/default.asp http://www.custompcb.com/ http://www.multi-circuit-boards.eu/?gclid=CK20v5fFga4CFYZN3godg1in6Q http://iteadstudio.com/store/index.php?cPath=19_20 https://www.itead.cc/open-pcb/pcb-prototyping.html http://www.seeedstudio.com/depot/fusion-pcb-service-p-835.html?cPath=185 http://imall.iteadstudio.com/open-pcb/pcb-prototyping.html?p=2&price=-100 - $0.2 !!! https://ecommerce.pcbfabexpress.com/ http://www.goldphoenixpcb.com/ http://oshpark.com https://www.protoexpress.com/ - SierraCircuits http://www.4pcbassembly.com/ http://www.mitchelectronics.co.uk/ http://www.customcircuitboards.com/ http://dirtypcbs.com/ http://www.elecrow.com/special-offer-for-2-layer-1010cm-max-green-pcb-510pcs-p-761.html http://pcbshopper.com/ http://smart-prototyping.com/PCB-Prototyping.html http://www.technotronix.us/ http://www.pcbunlimited.com/ http://store3.sure-electronics.com/ The list is not in any priority. I've never ordered board from any houses. I've just made board with the first two entries. This is a "work in progress". New board houses may be added, along with some comments.
  4. 1 point

    High volt power supply

    solved, thanks
  5. 1 point

    Solar Powered Water Pump

    I have some questions I was hoping someone would help me work through. I am building an outdoor fountain that I want powered by a solar cell. Can I run the solar cell wires directly into the BLDC motor and have it operate only when sun is shining? The brighter the sun the faster the motor turns. Or do I need more circuitry to make it work? If I do hook up a small 3.7 v 2000 mAh Li Ion battery, I need a charge controller? And what? Pump Voltage VDC - 6.0 Nominal Current Draw: 0.27 Amps Power Usage: 7.0 Watts Solar cell Output Voltage: 0.5 volts (Vmax) Output Current: 3.5 Amps (Imax) Average Power: 1.75 Watts Is there any way to turn the motor on for 1 minute every hour on the hour? Miniature controller or driver of some sort? System as compact and concealable as possible. Any help out there For this one? Oh one more thing, is there a micro charge controller out there that would protect the battery when it was full by dumping the load into some LED’s or something of that nature?
  6. 1 point
    You ask for a lot! Start with Ebay.com for transmitters and receivers: see: http://www.ebay.com/itm/Mini-88-108MHz-FM-Transmitter-Module-Wireless-Microphone-Dictagraph-Interceptor/141659602950?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%26asc%3D40832%26meid%3D5caec1e4bbe74e2fa065b6379434198a%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D111649741072
  7. 1 point

    12v lamp Dimmer lamp ideas?

    I have a 12v transformer for interior lights and a few lights for it, but want to make it a dimmer light. the working amps are 250mA. I would like to know how to wire up these three ways, so i can try each one and see if its any good and use the best.... Touch lamp. touch the metal to turn on dimmest. press again for brighter and again for brighter and again for off. Manual pot adjuster. and digital potentimeter. press up to turn up and make brighter and down for darker / off, and a reset button to turn instant off. Any help and sche... will be helpfull. Thanks in advance
  8. 1 point

    0-30V 0-3A Latest Data

    Hi all Ok, this is my end result. Built and tested and works quite well. I started with the version posted at the start of this thread. However I had a couple of problems with the current limiter. I didn't have much success with the current limiter clamping the input of U2 - sometimes it would not go right down to 0V, sometimes it would go just below. Just below was a big problem for me - U2 would start to oscillate, with bad consequences for anything connected to the output of the Q4... It would then drive the output high just when I wanted the current limit to become active I should add that I did not use TL2141 or MC34071s, this might be the root of my problem. I fixed this issue with a small change to circuit layout rather than going to expensive opamps. My mods (compared to the circuit posted on start of this thread): * current limit - I removed D9. To replace this, I added another BC548 - the base is driven by the current flowing through the current limit LED. The collector of this BC548 clamps the output of U2 (exactly like the existing BC548 driven by the negative rail). This arrangement means we don't care how close to its supply voltage the output of U3 can go. It avoids the possibility of driving the input of U2 out of spec. Clamping the output of U2 is much more like how the integrated voltage regulators work. It seems better to my mind, to keep U2 out of the loop when current limit is active. [Edit: note that U2 will need a small heatsink with this arrangement] * some rearrangement of the opamp power connections, for all three opamps... U1 & U3 are run via 15V zener diodes, to give a supply of approx 30V. That allows almost any cheap opamp to be used for U1 & U3 (741s or TL071 etc). U2 is connected to unregulated 44V and to the output side of the 0R47. * I used a MC33171 opamp for U2. It is high voltage, but much cheaper (they are £0.60 in UK) than TL2141 or MC34071 (both are £5 here). It is a low power IC by comparison. * 0-30V 4A transformer. * 2 x 6800uF smoothing caps.a big thanks to the contributors on this thread for their efforts, my project was greatly speeded up by borrowing a lot of their ideas Edit: * I also changed the 0R47 to 0R2, as the 0R47 generated too much heat at 3A for my liking. This also means R18 changes to 330K. These two values are not shown on the schematic here.
  9. 1 point
    Check this out! Awesome Project!
  10. 1 point

    Electronic Gun !!!!!!!!!

  11. 1 point

    Tesla with A811 tube

    I made a Tesla transformer with a A811 tube. I did not force anything, it can run for hours. The making of: http://www.youtube.com/watch?v=H7nivw7zxNM The result: http://www.youtube.com/watch?v=Mp721VgxWQI
  12. 1 point

    Re: high voltage meter problem

    The meter will have an impedance of 10M so to divide by 10, all you need to do is connect a 90M high voltage resistor in series with it. This can be made using nine 10M resistors in series, each resistor needs to be rated to 1/10th of voltage being measured.
  13. 1 point

    Electronic Gun !!!!!!!!!

    Hi Shantanu, Electrolytic capacitors have a vent on top to slowly release gasses that build up when the capacitor is connected with backwards polarity then has a high current. With a very high current, the vent cannot release the gasses slowly so the capacitor explodes. A 9V battery cannot provide a very high current. Maybe a battery made with series-connected AA Ni-Cad or Ni-MH cells would provide enough current for a backwards electrolytic capacitor to explode. Bad-smelling "fluff" comes out.
  14. 1 point

    An excellent electronics manual

    After running across this at the public library in town, I just had to order my own copy: "Practical Electronics for Inventors" by Paul Scherz It covers just about everything from DC to Microcontrollers and is well illustrated.
  15. 1 point
    Here is the book in pdf for you all. You can press the free button and you have to wait about a minute then it gives you the links. Just pick one. http://rapidshare.com/files/3372603/Practical_Electronics_for_Inventors.pdf
  16. 1 point
    after removing of ebook files, the page is not visited so much and not updated messages as before...
  17. 1 point
    >:( Thats rubbish to delete these I have come to this site only for these great books Please get them back ::)
  18. 1 point
    You are breaking the hearts of all the hobbysts who can not afford the cost of buying the books from amazon. most of us are ametures using the books for refrences or some other information. i dont think someone is making millions using these ebooks.
  19. 1 point
    What about links to "illegal contents" like, Can we use rapidshare or other sites to upload such illegal contents and then provide links through e-lab?? (As Elektor magazines thread hasn't been deleted)...... Books posted by Ante were really beneficial and one of the best features of e-lab.....Anyway, legal problems can't be ignored.......
  20. 1 point
    I am very sad too :-[ [move] :'( :-[ :-\ :'( :-[[/move] No doubt, ER has been the one of most attractive features of the site. All the thanks and respect goes to Mr. Ante for such a good contribution to this part of site. I now request MIXOS to leave the contents as it is not reasonable to throw away ones friends(books).
  21. 1 point

    12v lamp Dimmer lamp ideas?

    http://www.lsicsi.com/ Easier to get here. HWW its AC.
  22. 1 point

    Electronics Goldmine!!

    MP, Just click on
  23. 1 point
  24. 1 point

    0-30 Vdc Stabilized Power Supply

    R16 is 1K and is OK ???
  25. 1 point

    0-30 Vdc Stabilized Power Supply

    Think of the commas as periods or the periods as commas. These are used differently in different continents. It means the same. MP