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Originally posted by swan001
So all I got are: capacitors, paper clips, magnets, small-voltage electrical wires, small batteries, potentiometers, aluminium foil, switches and a small solder station.
Out of these I am trying to figure out how I can build an oscillator - a device which can produce radio waves. I am also trying to figure out how I can built a receiver - a thing which can receive this wave and make it a electrical signal. Nothing fancy, just send 1 kind of signal and receive it.
Any ideas?edit on 27-9-2012 by swan001 because: (no reason given)
Originally posted by swan001
reply to post by RussianScientists
I also happen to be on dial-up. Videos take eternity to load as I have limited internet time.edit on 27-9-2012 by swan001 because: (no reason given)
Originally posted by Hellhound604
reply to post by swan001
well, without transistors (or valves) you are going to battle to make something decent. with a single transistor, a couple of resistors and capacitors you can make a simple transmitter.
However, you can make a spark-transmitter (and receiver) with the stuff you have, however, your neighbors are going to hate you, as those things transmit RF all over. You will jam all radios, TV's etc, etc ...... but it is a fun way of irritating neighbors, lol ...
Originally posted by VoidHawk
reply to post by VoidHawk
I notice you dont mention semiconductors in the OP, but mention magnets, your not going to attempt one of those ancient vibratory things are you?
Originally posted by swan001
Originally posted by VoidHawk
reply to post by VoidHawk
I notice you dont mention semiconductors in the OP, but mention magnets, your not going to attempt one of those ancient vibratory things are you?
Ancient vibratory thing? What's that.
Originally posted by Hellhound604
Originally posted by swan001
Originally posted by VoidHawk
reply to post by VoidHawk
I notice you dont mention semiconductors in the OP, but mention magnets, your not going to attempt one of those ancient vibratory things are you?
Ancient vibratory thing? What's that.
the spark transmitter... You wire a coil, with a piece of magnetic metal completing the circuit. as soon as the coil magnetises, the coil attracts the metal, that breaks the circuit. The coil de-energises and that completes the circuit again..... So, you have a simple electro-magnetic oscillator. Depending on the inductance of the coil, you can have quite a high back emf developed across the coil, that generates a spark every time the circuit is broken. That spark is received by your receiver (and all other receivers in the area)..... Simple, that is how telegraph radios worked in the 1920's.
Originally posted by 46ACE
Originally posted by Hellhound604
Originally posted by swan001
Originally posted by VoidHawk
reply to post by VoidHawk
I notice you dont mention semiconductors in the OP, but mention magnets, your not going to attempt one of those ancient vibratory things are you?
Ancient vibratory thing? What's that.
the spark transmitter... You wire a coil, with a piece of magnetic metal completing the circuit. as soon as the coil magnetises, the coil attracts the metal, that breaks the circuit. The coil de-energises and that completes the circuit again..... So, you have a simple electro-magnetic oscillator. Depending on the inductance of the coil, you can have quite a high back emf developed across the coil, that generates a spark every time the circuit is broken. That spark is received by your receiver (and all other receivers in the area)..... Simple, that is how telegraph radios worked in the 1920's.
Hmmm.. could be done cleverly wiring a standard relay coil through one of its own nc contacts.But Some of those incorporate a diode acrss the coil to shunt(kill) the back emf "kick".
IMHO The transistor is easier and readily scrounge-able.."The professor"on Gilligan'sisland couldn't do it with cocoanuts and bamboo either. So "This is what I got"; may not get you there..edit on 28-9-2012 by 46ACE because: (no reason given)
Originally posted by swan001
I just wanna know if by "coil" you meant a wire of copper (which is hard to get but I could put my hands on this stuff) which looks like a doughnut, or if you meant a spring-like thing.
Like that?
edit on 30-9-2012 by swan001 because: (no reason given)