HI everyone!! any one hav idea how to make a simple transmitter and receiver for audio signals in my home ..to communicate with in my home..using bredboard.. Plz say me if u hav any good ideas or u have done anything lyk dat..thank u..
Transmitter:
Connect a 12V battery, a carbon microphone and a large coil of wire in series.
Receiver: +12V ! +------O Earphone +12V \\ ! ! 10K / ! / 10K \\ ! \\ +------
1 foot Dia / 0.01U 0.01U !/ 100 turns +---!!---+----!!---+---! 2N2222 !/ ! ! !\\e -------------! 2N2222 /100K \\ ! ( !\\e \\ 100K / +--- ( +12V ! / \\ ! ! ( ! ! ! ! / === 1U ( / 100K +--- +--------- 1K \\ ! ( \\ ! ! 1U ! / GND ! ! 1K / === ! ! ----+ 4.7U \\ ! ! GND +--+--- / GND ! ! ! ! ! ! 10K / === ! GND ! \\ ! ! ! / GND ------------ ! GND-- -- kensmith@rahul.net forging knowledge
Sure search for it under "phono oscillator" easy cheap works with AM or FM depending on what you build.
I also came across a dirt simple magnetic field transmitter for music during a search for something else (googledrift) can't find it now. A little more "upscale" than what Ken Smith is advocating. Instead of the carbon mike an audio amp drives a coil the size of the house.
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Google "induction headphones".
Cheers! Rich
Not much joy with "induction headphones" but "induction loop" works.
Lot of hits associated with hearing aids, classrooms and language translators, not much hard data like schematics.
Thing I came across earlier looked like it had a 60 HZ notch filter, so I wonder about hum pickup.
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