Quote:
Originally Posted by Funfinder
http://www.multiupload.com/FJ82JS1ID5
With the new added resistor (red dots only connected) you can see in the video loud and clearly how the ring gets detected which swings from a thread til 10cm with this improvised coil - with both cables at the FETs gate. The circuit now is much more sensitive and louder. Perhaps the basis of T2 needed some additional current, but I don't know why this has to be te one from the speaker.
Directional works only with grounded reflector. I made some fancy tests with my mini-tesla-coil plasma ball which got detected from 1m.
And I tested an op-amp LM358 connected at the output of the FET - louder but important analog signals were missing so I still use the transistors.
Perhaps antenna- and out in the wild-tests tomorrow or in the next few days.
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Hello Funfinder
In this last video i´m convinced your LRL is detecting the ring.
This is one way to simplificate the project,and probaly we dont need to use the BFO circuit. Thanks for this improvments.
Can you tell what kind of diode you have in your device ?
Thanks