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Welcome to my electronix section! Future designs include the noise cancellation device (found in the new mercedes and in the gov't's black helicopters!)

I also plan to upload a Jammer (a glorified transmitter....)

The is an RF sniffer. It 'sniffs' out bugs in the 300MHz range. (actually it sniffs a larger bandwidth, but this is where most 'bugs' operate.

This circuit is from The Alarm,Sensor & Security Circuit Cookbook, by Thomas Petruzzellis. TAB books, McGraw Hill

http://www.amazon.com/exec/obidos/ISBN=0830643141/001-6199374-1491941

Here's a Jpg of the RF-Sniffer schematic.

Components:
2    R1,R2     220 ohm 1/4w
2    R3,R4     2.43K ohm   1/4w
1    R5          510 ohm        1/4w
1    R6          1K ohm         1/4w
1    R7          240 ohm        1/4w
1    R8          10 ohm          1/4w
1    R9          47.5K ohm    1/4w
2    R10,R11    5K ohm potentiometer
6    C1,C2,C3,C5,C9,C10    0.1uF, 25V capacitors (disk)
1    C4    220uf, 25V capacitor electrolytic
2    C6,C7,C8    1000pF, 25V capacitor, mylar
2    D1,D2    FH1100 diode
10    D3-D10    LED's
2    L1,L2    82uH coil on ferrite core
1    IC1    LM3915N Display Driver
2    IC2,IC3   MAR6 op amp
    From: MMIC Mini Circuits Inc.
    POBox 3501166
    Brooklyn, NY 11235

1    IC4    LM317T regulator (optional)
1    S1    SPST toggle switch
1    Batt    9V battery