Popular Content

Showing most liked content since 07/27/2015 in all areas

  1. 3 points

    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
  2. 2 points

    0-30V 0-3A Latest Data

    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
  3. 2 points

    0-30 Vdc Stabilized Power Supply

    February 23 above on this page has the latest schematic of the revised 3A lab power supply.
  4. 2 points

    LM3914 pspice library

    Does anyone has LM3914 pspice library? i desperately need it..pleeeeease!
  5. 2 points

    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
  6. 2 points
    Illegal content (ebook/magazines/software) will be deleted without any notice. Thanks
  7. 2 points

    Overload Protector A16 ???

    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...........
  8. 2 points

    Overload Protector A16 ???

    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 ???
  9. 2 points

    Car battery to parallel port

    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
  10. 2 points

    Car battery to parallel port

    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.
  11. 2 points

    SL100 & SK100 transistor

    I can't find SL100 & SK100 transistor :'( Which transistors can replace these? Thank you for your help~ ;)
  12. 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.
  13. 1 point

    High volt power supply

    solved, thanks
  14. 1 point

    Regarding Cheapest PCB PRICE Inquiry

    I ordered a set of PCB on https://www.jlcpcb.com for a short run production build。 The quality of both the boards and the stencil are great. just cost me 2$.
  15. 1 point

    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.
  16. 1 point

    Transformer Watts

    I enlarged the image off the Amazon.com but could not read it https://www.amazon.com/Black-Decker-LCS1620-Lithium-battery/dp/B01M6TQPY2/ref=sr_1_3/141-0275392-4037060?ie=UTF8&qid=1499813460&sr=8-3&keywords=Black+%26+Decker+LCS1620 ...but ebay.com has a readable image http://www.ebay.com/itm/Black-Decker-LCS1620-20v-20-Volt-Lithum-Ion-Battery-Charger-NEW-/272090041874?epid=1640405275&hash=item3f59d48e12:g:mf8AAOSwawpXr3eh 120v @60hz 300ma
  17. 1 point

    0-30V Stabilized Power Supply

    hi any updates to this project
  18. 1 point

    Tube Datasheets

    Thank you for your share
  19. 1 point
    The colors of capacitors describe the types of capacitors. The color used to identify the components or parts on the circuit board. The round blue colored balls with dots indicate that its a capacitor. Same as other colors are used for other components.
  20. 1 point
  21. 1 point

    PCB manufactureres

    PCB Manufacturer uses: Front-end tool data preparation, Preparing the photo tools, Print inner layers, Etch inner layers, Register punch and Automatic Optical Inspection (AOI), Lay-up and bond, Drilling the PCB, Electroless copper deposition, Image the outer layers, Plating, Apply solder mask, Silk-screen and cure.
  22. 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
  23. 1 point

    How to find electronic parts?

    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?
  24. 1 point

    c828 transistor

    hi friend i have audio amplifier made with 2 * C828. can you tell me which transistor use instead c828? thanks
  25. 1 point

    Need help with a project

    How many digital IO lines do you have on your microcontroller? and how many LEDs do you want to drive?
  26. 1 point

    555 dc motor controller

    Good evening to everyone. Is it ok to use TIP 120 instead of TIP 122? Thanks in advance
  27. 1 point
    Hi I work on Hristo PCB, member of this community. http://diyfan.blogspot.com.es/2012/02/adjustable-lab-power-supply.html By changing the shunt, as I feared, the current regulation is very slow, now I'm looking solution without increasing the shunt. No load through the PCB and is cut so.
  28. 1 point


    You need to be more specific about your project, so we can help.
  29. 1 point

    Desperate Help Needed

    Thanks for the freelancing job recommendation but I am a 70 years old government worker (I am retired with a government pension and some stocks and bonds) so I do not need more income. I do whatever I want whenever I want.
  30. 1 point

    Desperate Help Needed

    Nobody makes an LA4058. You got the numbers mixed up, the schematic shows a Sanyo LA4508. Your 13.6V transformer must feed the rectifiers on the Power Part of the schematic. Maybe you fed the transformer wrongly to the amplifier instead of to the rectifiers? Then probably many parts are destroyed. Your 13.6V transformer will produce a peak of 19.2V and the rectifiers reduce it to +17.2V. With a 17V supply the LA4508 produces about 6W at clipping into 4 ohms per channel. Who told you 100W? It has fairly high distortion at low and high frequencies and it cuts frequencies above only 5kHz. Your amplifier probably uses one LA4508 for left woofer and left tweeter and the second LA4508 is probably used for right woofer and right tweeter.
  31. 1 point

    0-18V Pos/Neg 1A Current Limited

    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.
  32. 1 point

    0-30 Vdc Stabilized Power Supply

    The TIP41 has an fT of only 3MHz so it is slow and its delays will probably cause the output amplifier to oscillate and have transient problems. The BD139 that should be used is very fast with an fT of 190MHz. The hFE is not important because the minimum hFE of one of the two 2N3055 output transistors at 1.5A is 41 then the collector current of the BD139 must be a maximum of only (1.5A/41) x 2= 73mA where its minimum hFE is about 70 so the maximum output from opamp U2 must be only 73mA/70= 1mA but the minimum output from a TLE2141 opamp is much more at 20 so there is plenty of hFE available.
  33. 1 point

    0-30V 0-3A Latest Data

  34. 1 point

    0-30V 0-3A Latest Data

  35. 1 point

    PWM using 555 timer

    I read several datasheets and application notes on 555 timers, but I can't seem to find the information I'm looking for. Specifically, I'd like to use the 555 as a pulse width modulator by using the control voltage (pin 5). The datasheets indicate that in monostable mode, the output pulse width can be varied by modulating the voltage at pin 5 (V5). They also indicate that in astable mode, modulating V5 will modulate pulse position. What I'm wondering is this: What is the relationship between the control voltage, V5, and the values of the timing resistors and caps? There are standard formulas for timing based on these resistors and caps. How are those formulas affected by the introduction of V5? Thanks. Darrin
  36. 1 point

    Electronic Gun !!!!!!!!!

  37. 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
  38. 1 point


    TOYOTA Car indicator flasher part number TOYOTA:81980-50030.
  39. 1 point

    c828 transistor

    It is probably an Oriental 2SC828 transistor. Go to www.datasheetarchive.com to see its spec's and to see substitution guides.
  40. 1 point

    BTY79 and C106D Thyristor.

    BTY79 NTE Replacement BTY79-800R = NTE5531 BTY79-600R = NTE5529 BTY79-500R = NTE5529 BTY79-400R = NTE5527 NTE Datasheet http://www.nteinc.com/specs/5500to5599/pdf/nte5520_31.pdf C106D = NTE5457 NTE Datasheet http://www.nteinc.com/specs/5400to5499/pdf/nte5452_58.pdf Try these suppliers Digikey --- http://www.Digikey.com Mouser --- http://www.Mouser.com Newark --- http://www.newark.com MCM Electronics --- http://www.mcmelectronics.com
  41. 1 point

    diy 2.1 pc speaker

    so let me get this right. Theres a slight power difference in one Tda2003 to another even though there the same. but with a 8pin dual amp would work better cause there together in one IC.
  42. 1 point

    diy 2.1 pc speaker

    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.
  43. 1 point
    >:( Thats rubbish to delete these I have come to this site only for these great books Please get them back ::)
  44. 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).
  45. 1 point

    FM Micromitter only transmitting 8M

    Pin 8 of the IC should be 5.0V which is the output of the 78L05 voltage regulator or the 6V battery voltage. If you use the voltage regulator and D1 in series with it, then the minimum input voltage is 8.2V. Don't use a 9V battery because its voltage quickly falls lower. The micromitter has an attenuator of 3 resistors at its output to reduce its range. Remove the attenuator for much greater range.
  46. 1 point

    0-30 Vdc Stabilized Power Supply

    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.
  47. 1 point

    LM3914 pspice library

    Hi Maliki, National Semi doesn't have a spicy ( ;D) model for their LM3914. I looked on Google for Spice and then Pspice Model For LM3914 and found many people asking for a model too. One guy found a similar model to pspice online at a university. There are many French links. Parlez vous francais? Not me, and I hate Google's horrible translator. ;D
  48. 1 point

    12v lamp Dimmer lamp ideas?

    http://www.lsicsi.com/ Easier to get here. HWW its AC.
  49. 1 point

    Electronics Goldmine!!

    MP, Just click on
  50. 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