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mvs sarma

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Everything posted by mvs sarma

  1. hi James Bond O , you may have to indicate the error image and to members. Otherwise, getting some error message doesn't appear a good way of reporting. you can capture the screen and upload as .png. it helps proteous gurus to study and comment.
  2. I humbly request for datasheet or source of a dc-dc converter chip "BA7V1D" This chip was found in Philips portable DVD player model PET1030/37 Thanks in advance
  3. CHECK THIS LINK I FEEL THIS IS THE VERY DEVICE YOU HAVE SEEN. http://www.datasheetcatalog.com/datasheets_pdf/M/U/N/5/MUN5331DW1.shtml DATASHEET CAN BE DOWNLOADED RIGHT THERE. all the best.
  4. I tried in futile to get two datasheets for 16*3 LCD displays that i got few with me. 1. WD-C1603P made in 2003 and 2. GMX1603-16 made in 2005 these have flat cable SMD connectivity and 16 pin through hole ( not a standard 0.1" pitch) connecting facility. I request for help in the datasheets for these , if possible. thanks in advance.
  5. A tentative arrangement is shown here. the charging element of battery is not included. The fuse F1 is shown before the diode. Hope it serves the user.
  6. could you spend little time to see the video from the link below the finer details and paper comparison are available at http://sirloon.net/loonaweb/sirblog/pcb-using-toner-transfer-method-comparison
  7. you need a proper understanding and also patience. every time you change one or other item,then you will never know what mistake is being committed. try to use magazine paper or the type of paper used by RS components catalog. even text printed paper would work the ironing should better be done at 170 to 180 deg Celsius , and never more than that.on a Philips make auto iron i am told that it works on polyester clothing. this setting may be valid for others also. most important is the contamination free copper surface.and reasonably scrubbed by 3M scotch pad and washed and cleaned by a fresh paper napkin as cloth may gain contaminate it.
  8. Once you know the Oscilloscope make and model, your user manual will have a schematic for it, where the data for CRT base pins can be retrieved. further, most Oscilloscope CRTs have similar specs for the same size. if service manual is needed to get this data perhaps it can be had from say, http://www.eserviceinfo.com/downloadsm/11578/Hitachi_V-425.html
  9. For 1 or 2 components of general avaialbility, you should rather go to local seller or arrange with him any international seller would insist om MOQ per line item you have not indicated your location suppose, in my country, i get a 7805 for say 0.1$ equivalent. same when purchased on line costs me 27 (2+25for postage thro courier)
  10. dismayed-- cant even know what this language is in all the posts, mike!!
  11. You may consider 74HC4066. the datasheet can be studied for further details
  12. While I understand your IE8 based issues. The site management also can do their bit perhaps. How ever, you may check for Virus cleaning by using some popular antivirus, on our part of end users. I feel sad for the great loss of data pooled by lots of effort, over few years. I wait in anticipation of any good news . Perhaps the site admin may consider to load an earlier back up that might be still good instead of starting the calender ( of the site) with Jan 26th 2009.
  13. check your privacy options under tools_ internet options for IE8 please.
  14. red colored one is a Medium wave oscillator coil. it is also in the same shape as 10mm size IFT.
  15. perhaps the O P needs a movement not rotary switch. Generally the helical spring burns off, if used in wrong range. May be, it is better to call it dead , than further investing on it , and may be , if the O P likes, he may switch over to some auto ranging type 3.5 digit DMMs instead.
  16. Thanks Mixos, the admin. we had issuess of unable to land using FireFox till perhaps yday afternoon( Indian standard time=UTC+5.30) Same time we are able to land using IE8 from India. Today , Firefox is also normal Thanks again !!
  17. There are umpteen number of IF Transformers in market as replacements Companies have their own designs. If you are talking about identifying the front end, the middle and out put IFT identification, they generally follow Yellow, Green and white. Ohterwise , if you are talking of Inductance value by color strips painted on them, perhaps you need to follow the manufacturers datasheet .
  18. After that point of reaching 7V, I doubt that the said battery would have have capacity to drive the output transistor , through it might still drive the small needs of the LDO output load.
  19. while considering LDO regulator with 9V battery, i fear the reason that even if the battery comes to 6V or so, LM2951 would regulate-- is not justified. A 9V battery discharged till 6V can't deliver any useful load. thus 5.2 as Input from a 9V battery imagining to serve the circuit can well be forgotten
  20. Lovely product and finishing, wat69!!
  21. you need to phase lock your local oscillator to the 1 sec pulses that are output from the GPS receiver, by using proper divider ratio.One such article came up on silicon chip magazine of Australia in may and June issues of 2009. THUS IT HELPS TO LOCALLY HAVE A SYNCHRONIZED 10MHz OR SOME OTHER FREQUENCY.
  22. while Hero999 already indicated, i would like to add that the electrolytic capacitors have a life time and they deteriorate. At times, we see capacitors with a bulge on their top, a definite indication of its failure. I know of service Engineers in India, prefer to change all electrolytic capacitors as a batch, with same type and quality. It extends the life of the power supply, provided, of course, the Main and Aux transformers did not deteriorate.
  23. Hi AN920, Yes you definitely rocked the design. As i have finished making few PCBs, i may have to modd them manually. One observation - you may replace the modified schematic by changing the term Vcc on the collector of the modified darlington to +9V Dc .. this would be more appropriate after such nice improvements suggested. Sarma
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