DIY Simple FM Transmitter | Spying bug

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The range can be up to 20 meters after testing with obstacles, but you have to adjust the antenna on your Radio FM as the receiver. Inside a building without anything blocking the transmitter and the receiver.

feel free to comment to ask anything
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I was making them smaller than this in 1970. 1/4 mile range.

alcourtines
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Sound like your are sending a message from moon, just kidding

chandrurn
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The antenna is way too small for the frequency. To get a decent range you would need an antenna about 70 cm long and a ground plane, or a dipole 1.4 metres long.

TheAdwatson
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bro can you help me?
I have the same module, but the trimpot is broken. is there another way to replace that component?

prayitnabangun
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Silly DIY. Your antenna is, like wrote @Allan Watson, is non to small, he is to long in device cover. So that so long antenna are for cca 150db, and if work to long and to near radio receiver will fry small el. elements in transmitter. YU1AHBBCBGD

danycompservisracunara