Thijs Beckers
About the article

FM Microbug

FM Microbug
This bug circuit operates in the normal VHF FM band and can thus be received using any ordinary radio. The circuit based on a somewhat uncommon IC, the 74LS13, but with a bit of searching you can still manage to find one somewhere. The other five components (that’s all!) are all readily available. You might already have them in your parts drawer.
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