Fm transmiter

276

03:13:51

Tring to represent a little spybug. Using fm trasmiter.. is this right?

published 10 years ago

Gizmo

10 years ago

No, close though. Your circuit must have a feed back loop usually positive. In this way your bug will oscillate. You must also bias your transistor base for it to work well. Remove your Sine wave. You wont need it. Ill publish one of mine if you like.

Gizmo

10 years ago

Connect your inductor to positive also, remove your POT. Just connect it to positive as well. The 4.7p cap may not be large enough to make the circuit oscillate, move it up to 8-10pF....if it begins to oscillate rememer to adjust you clock, as it is not automatic if you remove the Sine₩ ....if you get it working just know this type does not like amplifiers at ALL! Lastly the Fm band is High Frequency example 100MEGAHERTZ. SO YOU MUST adjust you transistor settings. And if you build one a very good trans. Made for high freq. I.e. low junction capacitance.

Gizmo

10 years ago

I published my COLPITTS OSC. with amp. For you, study it and see why it works

thiah

10 years ago

Thanks.. I'll check it out

Gizmo

10 years ago

No problem, let me know if you need more help☺

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