Page 139 - 15 Dangerously Mad Projects for the Evil Genius

Chapter 9 ■ Covert Radio Bug 117

What You Will Need Step 1. Prepare the Stripboard

You will need the components listed in the Parts Figure 9-16 shows the stripboard layout for the cell
Bin to build the cell phone detector. phone detector.
You will also need the following tools:

T OOLBO X

■ Soldering equipment
■ A drill and assorted drill bits
■ A hot glue gun or self-adhesive pads

Assembly

The bug detector is built onto a small piece of
stripboard, with the meter variable resistor and
switch mounted in the lid of the plastic case. The
instructions below will lead you step by step Figure 9-16 The stripboard layout for the cell
through the process of building the detector. phone detector

P A RT S BIN
Part Quantity Description Source

R1, R3 2 1M 0.5-W metal film resistor Farnell: 9339809
R2, R5, R6 3 1k 0.5-W metal film resistor Farnell: 9339779
R4 1 5k variable resistor (potentiometer) Farnell: 1417135

C1, C2 2 100μF 16V electrolytic capacitor Farnell: 1136275
D1 1 Germanium diode – OA91 Farnell: 1208635
IC1 1 7611 op amp Farnell: 1018166
IC socket (optional) 1 Eight-pin DIL IC socket Farnell: 1101345
Meter 1 500μA FSD meter Farnell: 7758219

Switch 1 SPST toggle switch Farnell: 1661841
Battery clip 1 PP3 battery clip Farnell: 1183124
Stripboard 12 strips each of 12 holes Farnell: 1201473
Terminal block 1 Farnell: 1055837

Wire Thick solid core wire for antenna (20 AWG)
Battery 1 9V PP3 battery