Leaderboard

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

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

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.

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

Thanks for sharing your project with us. Could you give more details on the control board?

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.

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

I use copper wire, not rice wire. They put rice in everything they make, especially batteries.

So Finally which version of schematic is correct / flawless to build the PSU ?

February 23 above on this page has the latest schematic of the revised 3A lab power supply.

Does anyone has LM3914 pspice library? i desperately need it..pleeeeease!

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

Illegal content (ebook/magazines/software) will be deleted without any notice. Thanks

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...........

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 ???

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

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.

I can't find SL100 & SK100 transistor :'( Which transistors can replace these? Thank you for your help~ ;)

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.

I really like this circuit. Such a small and compact PCB.

I gather the machine has a fixed number of pulses it expects for each type of brew. It counts these via the two magnets. It also monitors the current draw by the motor. If the motor current drops off (no longer grinding) while it has not reach its count of rotations it "thinks" it is out of beans. If it is not out of beans and the motor is really working then it is missing counts at the hall effect sensor is what you are thinking? If it is really is out of beans it would discard the grounds that it has so far also? On second thought if it is missing counts it would run longer and grind to much coffee. So it must be that there are more counts to go and the current to the motor has fallen off?

Are you ready for the SUPERBOWL?! We are! We present you the Reward 7, ProBUDDY Kits SuperBowl 2022 edition with limited time and pcs between February 11 2022 - February 15 2022. https://www.kickstarter.com/projects/sundayrobotics/probuddy-kits-build-carry-store-your-projects-easily

Hi, where can I find datasheet of STK407-070B? I just want to make a home made amplifier. thanks :D

There is an article "Design Project2 - BCD Calculator" that maybe helpful. http://homepages.cae.wisc.edu/~ece352/fall02/old_project/p2.pdf

Thanks for Sharing

Perhaps the chip is over heating with to much current draw? Try connecting only two motors to see what happens. For the l298n chip itself: For the IO Peak Output Current (each Channel) – Non Repetitive (t = 100ms) 3.0A –Repetitive (80% on –20% off; ton = 10ms) 2.5A –DC Operation 2.0A TOTAL DC CURRENT UP TO 4 A

One 2N3055 transistor overheats in the original circuit that used a 24VAC transformer and produces 25VDC at 3A. Therefore I used higher voltage opamps, a 28V 4.2A transformer, a more modern driver transistor Q2 that can be cooled well and two 2N3055 transistors to share the heat on a very large heatsink. Some people added a fan and a smaller heatsink instead of a huge heatsink. If you connect the two 24V windings of your transformer in series and use the centertap as 0V then its output voltage will be 24VAC x 1.414= 34V minus the 1V for the two rectifiers then the supply voltage will be too low because the circuit needs a 28VAC transformer. Your transformer voltage is too high so it cannot be used for this project. Or you could parallel the two 24VAC windings or with the centertap as above then the maximum regulated output voltage will be 25VDC at 3A.

Hi, Just build this power supply. Works Ok but will blow output transistor instantly if output is shorted ! Any suggestion

Why do you show an LT1038? it is obsolete and is not made anymore. It is impossible for it to dissipate 32V x 10A= 320W. Its datasheet shows that with a huge heatsink with fan or with liquid nitrogen for cooling it can dissipate only 120W. Its control circuit gives 10A only when its input to output is a few volts and cuts the max current to 2.5A when the input to output is 30V.

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

WellPCB http://www.wellpcb.com WELLPCB is focusing on online prototypes orders, to meet the requirement of Low cost, Fast delivery, Easy order for customers around the world.

@Jeremy You may have 2 PCB's for AU$5 plus shipping in an envelope. Two boards weigh about 44grams. Email me if you would like some to: [email protected]x4mail.com Cheere, William PS. Seems your Kit has a problem to start with. Before I found this Forum I ordered two Banggood Kits. It is still not assembled and probably never will be. Anyway, over at this page there is a lengthy description on how to improve the Banggood kit. "www.paulvdiyblogs.net/2015/05/tuning-030v-dc-with-03a-psu-diy-kit.html"

Ok, skip the voltage and current LCD panel With R18 = 33 kOhm I have got 4,7 A on out... U3 was replaced for another .

http://www.irantk.ir/Power_IC/ http://www.irantk.ir/fbt/

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!

Circuit Design Software On Linux:As Linux OS have become one of the most popular opensource OS for Servers and Desktop, many software will release a linux version . It also applies to the circuit design software .Since we are using the Linux as our Operationg System , and We would like to search some Circuit Design Software Based On Linux . So let me introduce some types of Circuit design software in order to make readers more esaily choose their favorite Linux-based software . 1.EasyEDA . As a cross-platform Circuit desgin software , which is used on the browser and stored on the clound server . EasyEDA provides shematic capture , pcb layout , spice simulation and online pcb order functions which will give you an easy EDA design journey and make your circuit design work more easily and more productively . You could run it on windows , mac , linux or android platform ,as long as there is one brwoser on the OS and connecting to network. Let me have a preview of what EasyEDA provides : I.Schematic capture This is a most important function of the circuit design software ,almost every circuit design software provides schematic capture function . Because it is the basic entrance of understanding the circuit you design . What is more ,it could be used to be converted into pcb design file . Here is a screenshot of one scheamtic : One Schematic—Arduino 2560 Schematic II.Spice simulaton . There are many spice simulation tools such as Multisim , Proteus, Ltspice , KtechLab . EasyEDA provides many simulation models and the quick way to building models for Integrated circuits . Also ,EasyEDA provides Waveform viewer to preview the simulation results . Spice Simulation Example . Spice Simulation Waveform Viewer III.PCB layout Almost all circuit design softwares provide PCB layout function . This is the way to produce the PCB board and the basic tool. EasyEDA provides laying out unlimited pads , size of the boards , and more than 6 layrers of PCB Boards. PCB Layout IV.Import from third-party EDA Tools EasyEDA can import files from Altium Designer , LTspice ,Eagle, Kicad . V.Export Files EasyEDA can export EasyEDA source ,SVG source ,SVG file ,Image(png),and Pdf files. VI.PCB Order . EasyEDA provides online ordering PCB. When completing your Circuit PCB Design , if you do not want to spend much time on making your own PCB , you could order online PCB . 2.DipTrace The second most popular software running on linux I would like to introduce is DipTrace . DipTrace is an EDA software for designing schematic and PCB boards . It is based on Windows ,Mac , Linux . The Developers provide mutil-lingual interface and tutorials . DipTrace has 4 modules: Schematic Capture Editor, PCB Layout Editor with built-in shape-based autorouter and 3D Preview & Export, Component Editor, and Pattern Editor. There are some basic Features about DipTrace : I.Simple UI II.Multi-sheet and hierarchical schematics III.High-speed shape-based autorouter IV.Smart manual routing tools V.Wide import / export capabilities VI.Advanced verifications with real-time DRC VII.Real-time 3D PCB preview & STEP export VIII.Manufacturing output There are five modules for DipTrace . Schematic Capture PCB Layout 3D Preview and Export Component Editor Pattern Editor 3.gEDA gEDA is so important for it is firstly started in an effort to remedy the lack of free software EDA for Linux/Unix . And one of the long standing goal for gEDA is to provide a suite od EDA application for Linux . All applications in the gEDA suite compile and run on Linux. So it is the software that I could not miss on introducing circuit design software on Linux. There are three main features gEDA provides: I.gEDA provides schematic capture : II.gEDA provides PCB Editor III.gerber file viewer Here I should have to mention the term “gEDA Suite”. The term“gEDA”refers to all free software projects and applications that have asscioated with the gEDA project . These include： · gEDA/gaf - gschem and friends (the original project) · PCB - PCB layout program · Gerbv - Gerber file viewer · ngspice - a port of Berkeley SPICE · GnuCap - A modern electronic circuit simulation program · gspiceui - A GUI front end for ngspice/GnuCap · gwave - An analog waveform viewer · gaw - An analog waveform viewer a rewrite of gwave. Works with gspiceui. · Icarus Verilog - A Verilog simulator · GTKWave - A digital waveform viewer · wcalc - Transmission line and electromagnetic structure analysis For the importance of Linux to electronic design ,the open-source developers recognize it many years ago , and the gEDA is the proof of their early insight . The gEDA Project remains a federation of software tools developed by different (but sometimes overlapping) programmers. The thread which holds the project together is the shared vision of creating a powerful, community-based, open-source EDA toolkit. 4.Qucs Quite Universal Circuit Simulator (Qucs) is an open-source electronic circuit simulator software release under the GPL . It give you the ability to setup a circuit with graphical user interface and simulate the large-signal, small-signal and noise behaviour of the circuit. Qucs supports a growing list of analog and digital components as well as SPICE sub-circuits. It is intended to be much simpler to use and handle than other circuit simulators like gEDA or PSPICE. 5.Magic Now let me introduce a very-large-integration layout tool originally written by John Ousterhout his graduate students at UC Berkeley during the 1980s. As a free and opensource software ,subject to the requirement of BSD Licence ,Magic continues to be popular because it is easy to use and easy to expand for specialized tasks . Magic is widely cited as being the easiest tool to use for circuit layout, even for people who ultimately rely on commercial tools for their product design flow. So far I have recommend several circuit design tools on Linux . There are also Kicad ,eagle ,Fritzing,Open Circuit Design, and some other kinds of software that can run on Linux . As for the restriction of article length, Here I do not list all the circuit design software with detailed descriptions . Hope you could enjoy the free and all-platform supported tools like Easyeda, the linux-originated software tool like gEDA, the very-large-integration layout tool like Magic etc .

I don't know about function but it certainly seems like it's trying to look like it. I get why he wants everything integrated and looking the same but I despise the web 2.0 look. The first person to do this was doing something unique, everyone else, not so much.

A solenoid is just a linear motor therefore with no power you have no holding torque. You can get a mechanical assist with some via a spring but unless you want to hold open when the power is off and release when power is on I don't think this will do you much good. I think what you'll be after is some sort of mechanical solution beyond just the solenoid itself.

Continued

The current rating is not a problem. It's better to go higher than lower. Using a power relay to switch low current signals is only a problem at very low voltages. The problem with using a lower voltage relay is the contacts can arc over and what's worse it it could be unpredictable.The relay may seem fine most of the time but it could suddenly arc over due to ambient ionising radiation.

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

TOYOTA Car indicator flasher part number TOYOTA:81980-50030.

The TDA2003 does not bridge well because the output offset voltage are not matched for the two amplifiers like a monolithic bridged amplifier IC. But you might be lucky so try it. With a 14.4V supply the bridged output at clipping into 4 ohms is 14 watts. If your speakers are 8 ohms then the power is 8 Watts. If the supply voltage is less than 14.4V then the power is less. You should make an active crossover circuit.

It could be used as a switch, amplifier or (as you've said) part of a current limiting circuit. Bipolar transistors have so many applications that it's impossible to tell you what it's doing from what you've said. For example if I asked you "I've seen a flat head screw; what's it holding together?", how could you know the answer? If you post a picture I might be able to tell you but even then the only way is to post a schematic.

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.......

Hi all, I'm new here. I have just assembled a FM Micromitter (Miniature FM transmitter). http://www.siliconchip.com.au/cms/A_102010/article.html Construction went well with very few re soldered points (put a couple of things in the wrong way round, but hey I'm learning). When I went to do the testing and adjustment it says that I should be reading 5v between TP GND and pin 8 of IC1 but I only get a reading of 2.5v. Can anyone tell me why this might be and what the consequences of this might be. It DOES transmitt (I am currently transmitting on 88.9) but I loose the signal after approx 8M from the antenna. Is this related to my drop it voltage measured against what it should be? Should I trim my antenna to a specific length? Any comments or suggestions would be much appreciated. Regards David ???

For the Mechanical one just go to the Junk Yard and get a Dimmer out of any car you like. for the others you can do a couple of things. Get a standard touch lamp from the store and remove the touch circuit and hook it up to the input of the transformer. or Copy the circuit with Reverse Engineering. Then hook it up to your Transformer plug side. Here are some circuits if you want to tinker. http://ourworld.compuserve.com/homepages/Bill_Bowden/page6.htm#dimmer.gif http://ourworld.compuserve.com/homepages/Bill_Bowden/page8.htm#touch.gif

Darrin, Can this help you? Ante ::)

MP, Just click on

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