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help regarding the World's simplest transmitter II

 
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help regarding the World's simplest transmitter II
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thermalbite8
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Joined: 13 Aug 2004
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Post help regarding the World's simplest transmitter II Reply with quote
Hi

l was just wondering were is the input for the circuit (e.g microphone)
and how do u connect the ground next to the C1 in the circuit?

cheers
Fri Aug 13, 2004 7:48 pm View user's profile Send private message
pcs
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Joined: 18 Jan 2002
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One end goes to ground, the other to the cap.

If its electret mic, connect the positive terminal to + via 10-22K resistor.

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Fri Aug 13, 2004 9:47 pm View user's profile Send private message Visit poster's website
kf4tqs
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Post another question... Reply with quote
nevermind.


Last edited by kf4tqs on Sat Nov 05, 2005 8:25 am; edited 1 time in total
Fri Oct 28, 2005 1:30 am View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger
kf4tqs
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Post the mic thing Reply with quote
well, i can see where the mic would come in, guy, but i wouldn't connect the mic straight to the circuit. I'd at least use a preamp the the condensor mic. This can be done quite easily with a 2n2222 or 2n3904 npn transistor. Take a look around the net...you'll find some basic schematics on electret preamps. Basically, from the npn's collector, you'll connect that to the audio input of this transmitter.
Fri Oct 28, 2005 1:37 pm View user's profile Send private message Visit poster's website AIM Address Yahoo Messenger
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