Metrocync Posted October 1, 2006 Report Share Posted October 1, 2006 Hello, I'm completely new here! Quote Link to comment Share on other sites More sharing options...
AN920 Posted October 1, 2006 Report Share Posted October 1, 2006 Read here http://www.electronics-lab.com/forum/index.php?topic=4741.56 Quote Link to comment Share on other sites More sharing options...
Metrocync Posted October 1, 2006 Author Report Share Posted October 1, 2006 Man I wish I knew as much about circuits as Audioguru and AN920!I read the whole thread, not that I understood that much but it was fun.If there are any opinions about the schematic that I posted, I'm all ears!Thanks! Quote Link to comment Share on other sites More sharing options...
mvs sarma Posted October 4, 2006 Report Share Posted October 4, 2006 haiu have just added an emitter follwer to the outputof 2nd Tx right. If so, perhaps you need connect the aerial at the emiter , just see. hope this should sort out the issue.hope to get a feedbacksarma Quote Link to comment Share on other sites More sharing options...
audioguru Posted October 4, 2006 Report Share Posted October 4, 2006 Hi Metro,The original Miniature FM Transmitter circuit that you posted looks like the one that somebody said didn't work with a new battery and didn't work when its battery is a little used because its audio transistor is incorrectly biased. I made it and fixed it and made it better until it became my Mod4 FM Transmitter.You removed the very important 4.7pF capacitor which provides the positive feedback for its RF oscillator, and you removed the important capacitor at the base of the RF oscillator transistor that allows it to work as a common base stage.The output transistor you added won't do anything except waste battery power. Quote Link to comment Share on other sites More sharing options...
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