Where would you put the microphone if you wanted to use it as a bug??

no clue. maybe between the capacitor and ground? also, i'm not sure if this circuit has enough going for it to support audio.

methinks it would be usefull to add some sort of a little amp if U wanna use a microphone, try near the ass of the other transistor...

I would guess that you should put the mic in serie with the battarie on the positive side and then connect ground on negetive side for a better sound quality.

Though i think you will need to change the mic output depending on the power of the mic.

*Ground
Not the ground on the mic but just ground in general

This schematic is a tone transmitter. For sufficiently small values of the resistor, it outputs a tone, so having a resistive mic (carbon mic) in parallel with or in place of the resistor. would modulate the tone frequency with the voice. I'm not sure how you'd be able to demodulate it though, so this may not be the best circuit to use as a voice transmitter.

I think you would prob put it in place of capacitor cuz ur voice acts like a capacitor and creates its own tones instead of the capacitors tones

Whoops!
Sorry about my last post (and for bumping), it would NOT go in place of the capacator but as said before, it would be used like a resistor to control the capacitor.

How could you incorp. an oscillator?

TIA.

Hello again,

also, what value would you change to create a frequency of 512 Hz?

thanks again.

J

R1 ~ 4.7K

conect a electret micro. on ground and transistor basis.

i think thats all!?

HELLO; Could you use a encoder to use the ciruit as a remote
control.
I was planing to use it as a remote detonator.

P.S. I was looking for a rf ciruit other than wirless mics
THANK YOU!!!!

Where could I get a reciever to go with this transmitter?

Thanks.

LOOK IN MODULAR THEFT ALARM

what should C1 value be???

Quote

(andrew @ June 26 2003,21:49):

hi there nice transmitter but what about a r/w transmitter

nice circuit, has anyone tried to build it to see if it works?
also on what abe said, would there be a simple way to modulate\demodulate the signal?

would it be possible to use the circut for an RC robot?

hi all i need to use this circuit and to connect a photoresistor but how to build the rf reciever to receive from it

Hi All that is a very interesting cct. I built one almost exactly the same and it was shown as an FM transmitter. I.e. frequency modulated. Sure enough I could pick the carrier up on my FM radio about mid way on the scale. I was wondering how to put the audio/voice signal in when I noticed tapping and knocking noises coming up on the radio and a moved my physical circuit around ! ...... The wound coil was vibrating and altering the frequency which was of cource then being picked up on the FM receiver as frequency modulated signal ! So for a microphone you could try glueing the circuit to a bit of brick and attaching the coil to a window. That way the window would pick up voice signals and mechanically feed them like a big microphone through the circuit into the FM radio receiver. I havent tried this yet but if I see any replies to this post I will get my circuit out again as I still have it and a few other similar ones I was playing with for my data transmission project.

Kevin kevin@tinwizard.co.uk

What an awesome schematic!! So simple. I'd like to build it inside of my walkman and embed a switch to either transmit or play to the headphones... is this possible? Which leads would I use to hook up to the headphone jack (I know it would be mono). I can use the tape player as a powersource too.
Any advice on using small components?
Thanks!

- Dan