aimans

if that is the case then i can use a 9V battery to power the transmitter while connected to the phone line, what do you think about this battery thing, will it work?

this means that it cannot be done successfully, not a problem, i will measure the different p.d's around the phone line and post 'em here, and then the circuit can be modified accordingly, is this possible?

hmmmm, that is very interesting, is there a way i can stabilise the voltage using an LM317, or that wont help?

thanks a lot for the circuit, i will surely try it adn let you know, i hope it works as i am not sure whether LM2931 is available here, and then later try the phone transmitter, and i will try to post a better pic as i am at takin pictures i dont know if this is a stupid question or not but i'll ask as i have already asked naive ones before: is there any way your circuit can be converted into a phone transmitter? ::)

sorry, the thing is still not working, reversed the pin connections, i dont know what is wrong, please help me, someone, if anyone /? has time i can even post my circuit to someone interesed so that you can help me out when you have time?????????

yeah even i noticed them in the datasheets, i'll reverse the connections and try, but what if it doesnt work again????? :(

yes i made it agian and failed again in this fm transmitter, this time i corrected most of my previuos KNOWN mistakes but nothin on the radio. just cannot figure out why, my friends say i need someone to teach me! this time i replaced Q2(2N3563) with BC547 and the other transistor is the same, didn't have 5.6pF so replaced it with 5.8pF, i dont think that is the problem though. i calculated the inductance of the coils according to the instructions given, and they wre not at all close to those mentioned in the instructions[at the bottom of the page http://www.uoguelph.ca/~antoon/circ/FMTelTx/telephon.html ], so i just made the coils as it was given and not the values given, can someone help me in this thing i am very frustated with this phone transmitter, i tried them about 10 times but to no avail, someone please help me out here,

thanks 'esp1' that worked exactly as you said. the problem was that when i clicked on the FREE button Flashget started to downaload it(a 5KB page i guess), so i had to turn it off to get the job done, thanks,

i cannot download the files from the rapidshare site. the files are in the following thread http://www.electronics-lab.com/forum/index.php?topic=10085.msg55612#msg55612 i am totally new to rapidshare and dont have a clue how to use it

but how do i know which particular crystal is oscillating at fundamental mode or not?

the circuits you have linked are really good but i do not think i can construct them. most of the vital parts are not available here, like the FET and ZMV833ATA, and most probably not even the BH1417 ic, so cant i jsut replace the oscillator part of a regular FM transmitter and replace it with the crystal oscillator?

just that simple, and why did'nt i think of that? that's cause i do not know electronics, thanks

you mean we can even increase the frequency of an oscillator, that's nice. but can't i just use a 27MHz crystal and do not get it in the FM band, because i do not want other people to tune into my frequency, :-\

does anyone have 555IC led flasher circuits with atleast 2 LEDs? i had one but i guess i lost it.

after having a very unsuccessful time with FM transmitters using "wire" inductors and tunning capacitors, i am turning to crystal oscillators, so can any one tell me whether a crystal oscillator can be used for audio transmission like an FM transmitter? i have 2 crystal oscillators of 27.xxxMHz from an R/C toy, so is frequency the only difference or there are other draw backs?? and why are there not many audio transmissions on low frequency? too many question ehh, can you help out??? thanks