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  1. M

    FM Radio

  2. M

    FM Radio

    Fine-- there was a time lapse in my reverting back-- as i was out of station attending on a relation who was sick, thus not verymuch on net. i went thro all the letters  and also the philips application note an192 PIn 5 of TDA7000 sits on =ve voltage thus the Varicap positioning is RIGHT...
  3. M

    FM Radio

    hai all plsee carefully the FM radio schemtic of the project and you will appeciate that THE VARYICAP IS SHOWN CONNECTED WRONGLY-- IT SHOULD BE IN THE REVERSE DIRCTION TO THE BATTERY POLARITY, ON THEN, THE DIODE WOKS AS A VARYCAP PL TRY OUT YOU ARE SURE TO START RECEIVING STATIONS   ...
  4. M

    FM receiver circuit

    dear sukhbinder pl try this URL from electronicsfor you http://www.electronicsforu.com/electronicsforu/lab/ad.asp?url=/EFYLinux/circuit/aug2005/CI-01_Aug05.pdf&title=Medium-Power%20FM%20Transmitter sarma
  5. M

    Video RF Transmitter Schematics - I Found

    please try www.cq-tv.com and download 1994 february issue  (issue 165) you will find 24cm ATV Transmitter authored by Tim Forrester sarma
  6. M

    Electronics Magazine

    with a little  relaxation of area you may perhaps try ELECTRONICS FOR YOU  monthly mag from INDIA . you will not be disappointed. look at www.electronicsforu.com all the best sarma
  7. M

    Use a speaker as a microphone while useing it as a speaker

    dear audioguru, being a retired engr of telecom from india, i recollect that we were able to achieve a balance of say 40 db-- i do understand -- but i was only trying to think of a way loudly -- i do realise that we have to do a lot towards perfection. if something works and with a lot of zeel...
  8. M

    rf coil

    if it is aroud distinguhing between two cellponones ringing--RF has nperhpas less to do--all cdma or gsm technology-- setting a bit inyour phone makking it generate (simulate ringing)-- if it is only rquirement-- perhaps one could change the ring tones by selection and crate two different tones ...
  9. M

    Use a speaker as a microphone while useing it as a speaker

    i understand audioguru and thanks to Eurobuskers-- i really feel like realising it-- in telecom we have something called 4port hybrid-- ofcourse a pasive network. converting 4 wire to 2 wire -- if one can recall the principle involved there-- it is not a problem realising a speaker receiving...
  10. M

    Convert 0-30V 3A PSU to 5A or more

    as all of us know, in a linear power supply with such broad spec like 0-30v dc and current demand of 5 amps- lot of power is likely to be wasted- A) if the spec permits why not the rectified DC be processed thro a switcher and a non- isolated output is taken in a buck regulator form( as the...
  11. M

    Datasheet help plz

    please try this site http://www.datasheets.org.uk/specsheet.php?part=CS9021 similar for cs9018 also sarma
  12. M

    Use a speaker as a microphone while useing it as a speaker

    Alun, if cost is not a creteria, i suggest , you limit the bandwidth to 3khz, and now you try to switch the active limb of the speaker, to  Input / output at a faster rate(by some FET switches using an osc  ( say 4066). ( i mean chopper) thus if the switch points spkr as out put you listen and...
  13. M

    data sheet of S6700

    look at url below http://www.alldatasheet.com/view.jsp?Searchword=R6C and all the best
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