Practical Tech

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Electronics Hub - Latest Free Electronics Projects and Circuits

: RF Signal Detector
http://electronicsforu.com/electronicsforu/circuitarchives/view_article.asp?sno=1361&article_type=1&id=804&tt=unhot&b_type=new

RF Signal Detector This simple circuit can be used to trace the presence of RF signals and electromagnetic noise in your residential area, office or shop.