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  1. Hi all, Finally after some months have gone by, my build of the Power Supply is done. I have used liquibyte schematic Rev. 8 and had made the cirquit board according to the Gerber.zip file he posted here: 0-30V Stabilized Power Supply Page 88 posted October 6, 2014 "http://electronics-lab.com/community/index.php?/topic/29563-0-30v-stabilized-power-supply/&page=88" I left out D10 and R15 as per his description. I have plenty of boards leftover if someone has a need for it. There was only one mistake liquibyte made which have outlined in one of the pictures uploaded here. I was fortunate enough to get a big case with a Toroidal transformer from the scrapyard. Also many parts are recycled from various sources. Regards, William
    4 points
  2. Guest

    0-30V 0-3A Latest Data

    Finally, my post with the Eagle .sch and .brd, full gerbers, and parts list for Digikey in a zip file. I'm also including many of the pics I took as I was building that were posted both before and after this post. I'm still not completely done and may add more pics later. One thing I have changed is the third transformer for the auxiliary circuitry for the temperature sensor and fans and the displays (I wanted a better transformer than the Radio Shack special I had on hand). Archive attached. 30V.zip
    3 points
  3. But even if we disable debug, it will call print method and do not print anything. I mean we should make it something like #ifdef DEBUG Serial.print("\n debug controlled print"); #endif Here when we disable macro, its like code is not written for compiler, code will be removed in macro processing itself.
    2 points
  4. An H-Bridge (Full-Bridge) driver is quite popular in driving loads such as brushed DC motors and it is widely used in robotics and industry. The main advantages of using an H-Bridge driver are: high efficiency, rotation direction change, and braking the motor. In this article/video, I have introduced a complete H-Bridge DC motor driver using four IR3205 power MOSFETs and two IR2104 MOSFET drivers. Theoretically, the above-mentioned MOSFET can handle currents up to 80A, however, in practice we can expect to get currents up to 40A if the MOSFET temperature is kept as low as possible, using a big heatsink or even a fan. References Article: https://www.pcbway.com/blog/technology/Powerful_H_Bridge_DC_Motor_Driver.html [1]: IRF3205 Datasheet: http://www.irf.com/product-info/datasheets/data/irf3205.pdf [2]: IR2104 Datasheet: https://www.infineon.com/dgdl/Infineon-IR2104-DS-v01_00-EN.pdf?fileId=5546d462533600a4015355c7c1c31671 [3]: 1N5819 Datasheet: https://www.diodes.com/assets/Datasheets/ds23001.pdf [4]: IR2104 Schematic Symbol, PCB Footprint, 3D Model: https://componentsearchengine.com/part-view/IR2104PBF/Infineon [5]: IRF3205 Schematic Symbol, PCB Footprint, 3D Model: https://componentsearchengine.com/part-view/IRF3205ZPBF/Infineon [6]: CAD Plugins: https://www.samacsys.com/library-loader-help
    2 points
  5. Thanks for sharing your project with us. Could you give more details on the control board?
    2 points
  6. The original circuit should work fine up to 15V at 1A if you replace the old opamps with the newer higher voltage ones. You probably should recalculate the resistors that set the maximum voltage and current outputs. If the Chinese kit uses the transistor that shorts the opamp output when the power is turned off then the resistors that feed the transistor need to be recalculated for the reduced voltage. I have used perforated stripboard for many projects including very complicated ones. The copper strips are cut to length with a drill-bit and become almost half the wiring of a pcb. The parts and a few short jumper wires become the remainder of the wiring. Only one wire is in each hole so changing a part is easy like on a pcb.
    2 points
  7. Hi, as promised I made an English translation of my working. Maybe there is few mistakes and I am sorry for that ! Good reading. ExplicationEN.pdf
    2 points
  8. I use copper wire, not rice wire. They put rice in everything they make, especially batteries.
    2 points
  9. So Finally which version of schematic is correct / flawless to build the PSU ?
    2 points
  10. February 23 above on this page has the latest schematic of the revised 3A lab power supply.
    2 points
  11. Does anyone has LM3914 pspice library? i desperately need it..pleeeeease!
    2 points
  12. Guest

    Low power solenoid?

    I want to apply force for an extended amount of time (10 secs to a couple minutes) using a solenoid actuator. Unfortunately, it seems that solenoids use a lot of power when they are active. Is there a solenoid type that will only use power when switching between active and not active? There's probably a way I can do this with an external mechanism, but I was wondering if there may be commercial solenoids that have this built-in. Thanks, Jessica
    2 points
  13. Illegal content (ebook/magazines/software) will be deleted without any notice. Thanks
    2 points
  14. In a few circuit diagrams i have they refer to a what seems to me is a transistor with B C E as a overload protector and with number A16 and i have looked for a few hours on the net and i can't find anything on this little fellow, Anyone knows what I'm looking for and wanna share that info Please .... Come on !! 48 visits !! some one must know what it is !!! PNP is it also...........
    2 points
  15. At last i got a theori from a totally different place and he wasn't shure either but he had a weak memory that it could be 1A16 and a PNP transistor but after several deep searches on the I-net it didn't make any kind of senses whatsoever ???
    2 points
  16. When you use your resistive divider to drop the voltage down to 5 volts, you just need to select values of resistors to limit the current. This is basic ohm's law. V/R. Was this your question or did I misunderstand? I am not sure how you intend to monitor status by using one 5 volt pin. As an interface to the parallel port, you could use an LM3914. This would give you the resolution you need. There are also many other ways to proceed. You need to convert from analog to digital to read anything useful from the parallel port. MP
    2 points
  17. Hi TJBraza, http://www.analog.com/UploadedFiles/Data_Sheets/ADT7485A.pdf Although, it will probably require a small program written in C or Visual basic to convert the string MSB & LSB into a more easier read etc... Take a moment and review the data sheet, the IC has a lot of potential.
    2 points
  18. I can't find SL100 & SK100 transistor :'( Which transistors can replace these? Thank you for your help~ ;)
    2 points
  19. 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.
    2 points
  20. Taking the FETMX6ULL-C platform as an example, if you want to use VPN, you need to open the tun configuration in the kernel in the following way: Kernel Compilation Choose either of the two methods below: 1. Modify the.config file directly Locate the.config file in the kernel source path. Find the CONFIG _ TUN in the file and modify it as follows: Replace the kernel's config file with .config. * Subject to actual use. Recompile the kernel. 2. Configure the TUN using the graphical configuration interface Make menuconfig. Locate the following locations: Save and exit after modification, which can be seen in.config Replace the kernel's config file with .config. * Subject to actual use. Recompile the kernel. Update kernel: The arch/arm/boot/zImage file is generated after compilation, and the kernel can be replaced either by updating the kernel separately or by re-burning it. Use this file to replace the file with the same name in the target path of the flashing tool. Refer to the single-step kernel update chapter of the FETmx6ull-c User's Manual to replace the zImage file separately. Compilation module: In the kernel source code, some of the drivers are compiled in the form of modules, which are loaded from the specified path by the kernel version number when the system boots. When we recompile the kernel and update the kernel, the kernel version number in the system will be changed, the kernel version number can be viewed through the uname -r command. When you update the kernel, the uname -r version number changes, but the version number in the path where the module is stored (/lib/modules/) does not change. It may cause the module to fail to load, typically after updating the kernel, WiFi cannot be used. As seen below, the name under uanme -r and the name under /lib/modules/ are not the same, so you can't load the module when you go to the/lib/modules/$(uname -r) directory when booting up, and you need to change both names to be the same. You can solve this problem in two ways: 1. Modify the module load path and change to the version number of the kernel; 2. Repackage modules; The first method has two disadvantages: a. Not suitable for batch modification; b. Not suitable for changing the module driver; So it is possible to repackage the module when compiling the kernel: After executing the above operation, .tmp/root/modules.tar.bz2 will be generated, which can replace the file with the same name under the target path in the flashing tool. It is also extracted directly in the file system:
    1 point
  21. You can add a decoupling capacitor. Sometimes, the output waveform can be clipped due to noise in the power supply. Adding a decoupling capacitor between the power supply and the ground can help reduce the noise and improve the output waveform.
    1 point
  22. HarryA

    BGA rework Process?

    Is Rolling Meadows, IL 60008 near you? see: https://www.solder.net/training-courses/bga-rework-training/ See for low key diy rework: https://www.instructables.com/BGA-rework/
    1 point
  23. Hi friends. I'm still quite new to this business, but now I'm writing a project that will allow real-time temperature monitoring. So far, this is at a theoretical stage and needs your advice and experience. I'm using a MLT028Q40-5 TFT display with a controller through the driver and it works great. I need help with data to import from an NTC temperature sensor.
    1 point
  24. Breadboards, arduinos, cables.. We all love and work with those but when they are connected together as the hardware of our projects, it can get messy. To help all of us at that point, we've created a solution, first we used it, then sent prototypes out for review and then its now live on Kickstarter waiting for you to reserve yours: ProBUDDY Kits. Here is how it works: The hardware is taken on to our Base Plates and get fixed with special magnetic holders called ProBUDDY's. Then its so easy to work on, carry, store, demonstrate your projects. You can retrieve the components easily for another project. You can store your projects on any vertical (yes!) surfaces and keep your desks clean. And there are more. Here I want to share the Kickstarter link, thank you all for your support; https://www.kickstarter.com/project...y-kits-build-carry-store-your-projects-easily Best Sunday Robotics Team
    1 point
  25. HarryA

    MOD-23 counter

    The circuit below is similar to what you want to do. Using a 4 input NAND gate you can connect it to the 4 outputs that represent the valve you want. Your NAND gate output would connect to the clr line.
    1 point
  26. There is a library file ( GOLANG library for SPI ) here that maybe helpful? https://github.com/stamp/CS5484 I have problems finding the page that has the {code} button to download the file; you may have to dork around with the URL a bit.
    1 point
  27. There is information here on Visual Servoing that maybe helpful; particularly the numerous references at the end of the article. https://en.wikipedia.org/wiki/Visual_servoing If you look at a bmp file of a smd image like this one (I could not find an image of the bottom of a smd). You can see the white background as FF FF FF and one scan line across the component highlighted. So in theory one could find the four corners and calculated the rotation and any x y offset. In bmp files the image is inverted. If you only need the rotation then only part of one edge would be required to calculate it I believe. smd compoint.bmp
    1 point
  28. admin

    0-30V 0-3A Latest Data

    I am attaching a Troubleshooting FAQ’s I found for this power supply. It summarizes the 150 pages of an old thread into a single document. Hope this helps get some questions answered. 0-30V 0-3A Bench Power Supply Unit Troubleshooting FAQ’s.pdf
    1 point
  29. If you do not need SMD perhaps "The LT138A/LT338A (LM138/LM338) series of adjustable regulators provide 5A output current over an output voltage range of 1.2V to 32V." The LM338 is about 1$ each on ebay.
    1 point
  30. Hi, Just build this power supply. Works Ok but will blow output transistor instantly if output is shorted ! Any suggestion
    1 point
  31. Hi Youkito1991, Nice work!. Thank you for sharing your design and make the PCB available for anyone who wish to use it. Your description is nice and also the support of pictures is very useful. Regards, William
    1 point
  32. audioguru

    acid_circuit

    Why are you using an old fashioned vented lead-acid battery? Most circuits today are powered by rechargeable Ni-MH or Lithium batteries that have no acid.
    1 point
  33. I am a regular PCB designer. Check my designs specimens. If you have such inqyiry in future then e-mail me at [email protected] or call on +923214322695 Sample Designs.zip
    1 point
  34. Dmitry

    MS.NET on ARM devices

    Some developers really need MS .NET Framework for some reason on their ARM devices (mainly on Raspberry Pi). So, basing on their requests, I have made a short tutorial on how to setup .NET on Raspberry Pi.
    1 point
  35. youth

    PCB manufactureres

    I use WellPCB quite a bit. They aren't the cheapest, but the quality is superb, they may offer features and service you might need. http://www.wellpcb.com/ If it's only a single board or two I tend to make them myself.
    1 point
  36. 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
    1 point
  37. You points are well made; thanks. On day one I found two voltage boosters on Ebay that gave more than 100 volts so I ordered both of them from China. The first one I received was a 12v dc to 200 v dc. After connecting it up and adjusting it for 200 v I put a 100k resistor across the output and got 2 volts output! It took a one mega-ohm load to keep 200 v. The second one (12v dc to 220 v ac) works well. I connected it to the 220v to 120v step down transformer and into a full wave bridge rectifier with a 100mfd capacitor and got 140 v dc; 9.6 volts input. With a 8.4 v NiMH rechargeable battery I get 128 v dc. So I am happy with that and very surprised that the 50/60 hertz transformer works at all!
    1 point
  38. Are u looking for a way to connect the Arduino to the internet easily? Do you want to develop your IoT project quickly without much hassle? ARMA IoT might just be the thing for you! The simple and efficient Arduino shield is powered through a esp12f wifi module, which enables it to be connected to the wifi network. it also has an SD card slot for for extra data storage like its wired brethren the Ethernet Shield. The ARMA IoT goes a step further and provides an easy plug and play feature for most of the common devices such as sensors, motors, LCDs and relays. The ARMA IoT is a great place for beginners to start their IoT project, as it requires minimum time to setup the hardware all thanks to the plug and play feature. Even the programming is simplified through the help of apps such as Blynk, which provides easy feature of controlling the Arduino through your Android or iOS phone. Thingspeak an upcoming IoT platform is also supported by the shield. The ARMA IoT platform proves as a tool for aspiring beginners and also a prototyping tool for advanced users. IoT products can be developed much faster with the help of this board. Weather it is creating a simple IoT project such as blinking LEDs or controlling relays, or developing your own Home automation system, the ARMA IoT facilitates it all and things seem to happen rather quickly with all the features provided on the board. The wifi connection feature can provide fast communication between devices or two instances of ARMA itself, making it applicable for simple swarm robotics, wireless controllers etc. The applications can also be extended to simple robotics, Energy management systems and it does not stop there as it all depends upon the users creativity. To get started simple tutorials are provided on the YouTube page of ARMA IoT, the link below guides on the setup of Arduino and ARMA IoT with the help of Blynk app More tutorials and projects will be posted to help you make the most of the shield. Of Course there are also various DIY communities that can provide you with both support and inspiration for your upcoming IoT projects. thus ARMA is another simple board that has the ability to bind many devices together. The ARMA IoT is still undergoing a crowdfunding campaign in Indiegogo and is available for pre-order. https://www.indiegogo.com/projects/arma-iot-breakout-board-for-arduino#/
    1 point
  39. I buy electronic parts from Digikey and Newark because they have offices and warehouses in my country and they stock everything. What can't you find?
    1 point
  40. eplanet

    c828 transistor

    hi friend i have audio amplifier made with 2 * C828. can you tell me which transistor use instead c828? thanks
    1 point
  41. admin

    SOFT ROBOTIC FISH

    Maybe you can consider casting soft plastic or silicon, i think this would be ideal.
    1 point
  42. Hiya, I now cant find the projects I found yesterday sorry... but the below link is a device similar to what I'm looking for, but I'm looking to make this work in reverse (hoping this may help). The distance I'm trying to achieve would be for the alarm to activate if transmitter was anything from 0-10 feet away. http://www.pimall.com/nais/rdiftagalert.html
    1 point
  43. audioguru

    Desperate Help Needed

    Distortion can blow out a tweeter because distortion has strong high frequency harmonics. Try feeding an input directly to the power amplifier without connecting the preamp.
    1 point
  44. Hero999

    negative ioniser

    The same basic blocking oscillator circuit, normally used to drive a flyback transformer, can also drive a centre tapped or dual primary mains transformer. Here's an example of a capacitor charger using a mains transformer with a centre tapped primary. It should be able to drive a voltage multiplier circuit. C1 1 uF D2 1N4948 R2 +------||------+ T1 1.2kV PRV 1K 1W | | +-----|>|-----/\/\---+------o + | R1 4.7K, 1W | red ||( blk | +-----/\/\-----+------+ ||( | | yel )||( +_|_ C2 + o----------------------------------+ ||( --- 300 uF | red )||( - | 450 V | +--------------+ ||( | | Q1 | ||( blk | 6 to 12 | |/ C +--------------------+------o - VDC, 2A +----| 2N3055 Stancor P-6134 D1 _|_ |\ E 117 V Primary (blk-blk) 1N4007 /_\ | 6.3 VCT Secondary (red-yel-red) | | - o------------+------+ http://www.repairfaq.org/sam/samschem.htm#schssi
    1 point
  45. 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.
    1 point
  46. Hi Gruber, The current-setting pot in this project has a tolerance of 20% and the values of the resistors were chosen so it provides 3A if the pot's resistance is 20% high. If your pot's resistance is 20% low then with it set to max, the project will try to produce 4.2A. Such a high current will overload the transformer and cause its core to saturate. A transformer with a saturated core isn't a transformer anymore, it is a piece of wire across the mains, blowing fuses. You should add a trimpot in series with the current-setting pot. Adjust the trimpot so the project supplies a max of exactly 3A when the current-setting pot is at max.
    1 point
  47. R16 is 1K and is OK ???
    1 point
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