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  1. MMAshwin

    SPST relay replacement

    Hi, Depending on the current requirments of you motor then what about an analog switch. See :- http://dbserv.maxim-ic.com/tarticle/view_article.cfm?article_id=90 but remember these do have an on resistance (2 ohms & above) unlike your relay so if your motor draws lots of current then you may...
  2. MMAshwin

    electrolytic capacitors: potential on case

    Hi, The electrolytics capacitors in SMPS supplies aren't your run of the mill electrolytics. If they are they quickly dry out and fail an ESR test and you supply goes phht. Saying that it would seem logical to have the can at the lowest potential possible from a safety point of view. So if you...
  3. MMAshwin

    identification of SMD components

    Hi, Check out the following links:- http://www.rfcafe.com/references/electrical/smd_package_marking.htm http://www.marsport.demon.co.uk/smd/codeintro.htm http://www.itis.spb.ru/win/info_eng.htm (the above link is in russian - with english may be of some use) Or contact the maufacturer Any help...
  4. MMAshwin

    HELP!!!

    Hi, What about it ? Any help ?, yes no let me know. Regards
  5. MMAshwin

    Formating hard drive

    Hi, 1. Make sure you back up the data because once formatted theres no going back 2. Make a bootable floppy & make sure the FDISK and FORMAT commands are copied on it from C;\Windows\command3. Boot up from your floppy and if required run FDISK to partition your hard drive. 4. After FDISK then...
  6. MMAshwin

    How to vary Capacitance using a variable resistor

    Hi again, So you blew out my varactor & switched capacitance ideas :-( . Try http://www.hep.upenn.edu/SNO/daq/parts/lm310.pdf On page 12 is a variable capactor circuit using the multiplier principle. or for millar intergrators see http://lucas.elo.utfsm.cl/elo_b/an-32-2.pdf Page 1 If you...
  7. MMAshwin

    How to vary Capacitance using a variable resistor

    Hi, A couple of thoughts. 1. You could use a varactor diode (although the capcitance values are small) http://www.americanmicrosemi.com/tutorials/varactor.htm for a preview 2. How about an analog switch which selects different capacitors...
  8. MMAshwin

    How to keep an LED ON even after the voltage drops to zero?

    ...just to hold the graphics at http://www.laffalot.freeservers.com/ Then in your post you refer to the images on your site/directory like this *img http://www.laffalot.freeservers.com/workb.jpg* but replace the * with open & close square brackets []. I had to put stars otherwise all you...
  9. MMAshwin

    How to keep an LED ON even after the voltage drops to zero?

    Hi, How long is the voltage zero for ?. If its for a long time then this simple circuit might be suitable. The diode is to stop the battery powering the circuit when there is no power. The first resistor limits the charging current to the battery. The second to the LED (when its powered by...
  10. MMAshwin

    pc power supply pulsed output every 10 secs

    Hi, Have you tried disconnecting everything to make sure its not being loaded (including fan). As for those pin outs try http://www.fairchildsemi.com/ds/ML/ML4824-1.pdf http://www.fairchildsemi.com/ds/ML/ML4824-2.pdf Any help ?, yes no let me know. Regards
  11. MMAshwin

    how to enter in IBM PII setup

    Hi, I agree with the above. I have seen many which use F1 and the odd F12. Also there was one that required a three fingered press to access the CMOS and this could be at any time not just run up. If you have no luck trying the various keys on startup you could always go to the manufacturer...
  12. MMAshwin

    anyone know how to program LCD with KS0070B controller

    Hi, 1. It could be your program. Are you sending the characters over & over. You only need send them the once and they should get stored in the LCD RAM. 2. It could be a faulty LCD module. Have you tried any others. Any help ?, yes no let me know. Regards
  13. MMAshwin

    Wierd Resistor Identifaction

    Hi, Just a thought. It may be as suggested a five band metal film resistor but that would be a freaky value. It could also be the type which has a failure rate band, i.e. what the mean time between failure might be. If that is the case then it would be 10 x 10e-2 ohms or more simply 0.1 Ohms...
  14. MMAshwin

    anyone know how to program LCD with KS0070B controller

    Hi, You might want to see the data sheet on the KS0070B driver chip at http://www.asamicros.com/pub/project_source/ks0070b.pdf The commands for programming start at page 12 of the pdf file. Its a matter of sending the correct sequence of binary 1's (+5v) to the controller. As an example...
  15. MMAshwin

    automotive grounding

    Hi, I wonder why they ever called it chassis ground. (But thats another question). Surely its the return to the battery using the chassis as the return conductor. As the car trundles along on its rubber wheels 12" or so off the ground, who knows what the chassis voltage is. As far as the...
  16. MMAshwin

    Need a Timer Circuit to Drive Multiplexer 4051.

    Hi, Whats your email & I'll send it Regards Any help ?, yes no let me know. Regards
  17. MMAshwin

    ERLANG

    Hi, (this is the same answer I gave to a previous post) Try these links http://www.erlang.com For all things Erlang http://www.erlang.com/calculator/erlc/ For an Erlang C calculator (then make your own table) http://www.erlang.com/excel.html Make your own excel Erlang tables...
  18. MMAshwin

    Need a Timer Circuit to Drive Multiplexer 4051.

    Hi, Sorry this has taken so long but I've had a lot on. The diagram below is the circuit Where IC1 = 555, IC2 = 4060 & IC3 = 4017. I've posted a completed solution at the following link, including timing waveforms and explainations. If I had the time I would have like to make it more...
  19. MMAshwin

    cftime and ascftime (ANSI C)

    Hi, Is it you want the code that executes as the functions are executed or examples of the functions themselves.(I thought you wanted the latter) If its the former then you want the code that the compiler compiles as it interprets the function from the time.h library. Mmm tricky...
  20. MMAshwin

    switchmode power supplies

    Hi, What is a Switchmode power supply ?. There are many types of switch mode power supply, but basically the principles are the same. You take the incoming supply (can be a/c or d/c depending upon the design of the smps) and chop it up at very high frequency. This chopped up dc (now ac) is...

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