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  1. M

    Resonator datasheet needed

    here goes a pdf of ceramic resonators sarma ceralock.pdf
  2. M

    help

    please try IRFZ44  intead of  ON resistance of 12 m ohms it may be 28 M ohms  device can work upto 60v and Id od of 50 amps It is generally available sarma
  3. M

    silver soldering w/o turning silver oxide

    TRY THIS SITE prst-ab.aps.org/pdf/PRSTAB/v9/i8/e083501 picked up at http://www.google.co.in/search?q=PREVENT+SILVER+FROM+OXIDATION+WHILE+SOLDERING&hl=en&lr=&client=firefox-a&rls=org.mozilla:en-GB:official_s&start=40&sa=N sarma
  4. M

    Google before posting

    i agree with MP as i had experienced situations when i go for search, it refers back to ELECTRONICS LAB. HATS OFF TO OUR WEBSITE &  ITS CONTRIBUTERS. HAVING SAID THAT,  i personally feel that a student, hobbyist, old fellow like me  dervie encouragement equally when we see that there is...
  5. M

    Audiogurus opinion of inverter

    hai audio guru, while in line with your concept, you may perhaps agree that the power line, even though on the same pcb, is likely to have large variations as the load increases and it would be safe to have filtered , rather condtioned supply for the CD4047B, pl comment sarma
  6. M

    Audiogurus opinion of inverter

    It has been a practice to keep emmiter resistors to limit th current under failures before a fuse could blow. i suggest few more  additions. 1. an electrolytic cap of considerable value proportion to the load crt across the +ve and -ve very near to the transformer mid point and common ground of...
  7. M

    50Hz when you touch Oscilloscope probe

    this problem is prevelent even with 74 series . a cct rigged up on a prototype had misarably failed due to noice pick-up. perhaps with proper precautions towards poer decoupling at each IC and by keeping poer extention boards, etc away from the project prototype, and by sticking the specific...
  8. M

    85C Cap ESR vs 105C Cap ESR!

    ESR stands for equivalent series resistance of an eleco. no componenet being ideal, the elec caps used for filtering the output shold be of low ESR and such caps are being supplied as esr caps. you may search for addl data on the subject www.e-sonic.com/whatsnew/emag2004_3/emag_Passive_nic.pdf...
  9. M

    PIC 18F4550 datasheet needed

    it is almost 7Mb and i fear the only way is to download for oneself as there wold be restriction on size of of attachement please try at http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1434 sarma
  10. M

    4 Cellphone chargers into 1?

    good nyjumpee, it calls for 2.6 amps if all the items are to be charged same time you will perhaps have problem once the sigle proposed charges goes faulty--- redundancy would be better you may try to develop a psu with 5.0 output and a current capacity of atleast 3 amps -- may be LM317 with...
  11. M

    Need help identifying part

    they are definitely capacitors metalysed Polyester type  mostly used for decoupling or interstage coupling you may  measure tha ctual vaue on any multimeter having capacitance range sarma
  12. M

    My amp's distorting

    please see the BTL aplifier application in the attached Philips Application note. the electrolytic cap on pin 3 is not shown in BTL application pl check also the input should be 1v line in equivalent  for proper audio output as audioguru already suggested try pre setting the vol cont of the...
  13. M

    MODEL PSPICE UC3854

    please try url http://www.smps.com/PSpice/simulation.shtml in the bottom of page you get the locations for Pspice models sarma
  14. M

    project help with toy IC boards

    i am totally in line with audioguru's philosophy-- there were times when power was generally indicated (specified) as RMS watts. --over times the pmpo took over. in fact the transformer used in the multimedia speakers is too small( if not three small) it coud deliver few ma at 12V  finally the...
  15. M

    Miniature FM transmitter modifications

    hai u have just added an emitter follwer to the outputof 2nd Tx right. If so, perhaps you need connect the aerial at the emiter , just see. hope this should sort out the issue. hope to get a feedback sarma
  16. M

    need help for cfl lighting

    you may use 555 as oscillator and use one driver transistor like C1061 and use 6V/230V transformer [ if possible the core shall be repacked (All Es one side and all I s other side ], with a gaping paper placed between them and the whole Transformer repacked) to prevent saturation-- for...
  17. M

    project help with toy IC boards

    please download datasheet as sukhbider indexed in his message (reply#28)and you will find mono, stereo and even the tentative pcb layouts-- y-day iattended a mutimedia speakers using a similar version UTC2822 9V DC input) and is working fine -- you may rather GO AHEAD sarma
  18. M

    Valve amp.

    you may well settle for an ic based amplifier instead of valve amplifier. it might save power and space both , unless you are specific of valves however you might need  valves like EL 84 FOR OUTPUT POWER sarma
  19. M

    I think I cooked my A/V Transmitter

    223 and 473 appear to be smd resistors as per the photo reg the ic marked BBHH let me try as the item is purcheased at Ebay  the concerned add may indicate the manufacturer and perhaps a mail req the manufacturer may help for the service data with schematic and artwork or even the ebay may...
  20. M

    Need help identifying part

    THE PART COULD BE  A LEAKED CAPACITOR OF 100n OR IT  COULD AT THE WORST BE A PARALLEL R-C WITH 1M2  AS RESISTOR AND WITH TIME CONSTANT OF 100nS SARMA
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