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No Audio input to TX


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I am having trouble hooking up a pre amp mic to my 1.2 Ghz video TX

I have tried LM358 circuit

and a commercial 2 transistor pre-champ

No luck just lots of video noise

Only thing that works is my Gopro live feed into audio input works great

but i dont not what is in there circuit to copy it .....what am i missing here

cheers

brett

post-5144-0-20746100-1378518001_thumb.jp

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Correct it wasnt my circuit it was the Vcc to the preamp not geting power

I ended up using my very first circuit as i didnt want much gain and used a single transistor works great

I used BC549 instead of 2n3904

post-5144-0-85738600-1378559658_thumb.jp

post-5144-0-96775200-1378559670_thumb.jp

Edited by Kermet
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