Page 130 - 15 Dangerously Mad Projects for the Evil Genius

Chapter 9 ■ Covert Radio Bug 109

What You Will Need Step 1. Prepare the Stripboard

You will need the components listed in the Parts Figure 9-4 shows the stripboard layout for the
Bin to build the bug. microphone amplifier.
You will also need the following tools: The first step is to cut a piece of stripboard that
has ten strips, each with 22 holes. Seven breaks
T OOLBO X should be made in the tracks. Make these using a
drill bit, employing the bit as a hand tool by
■ Soldering equipment
rotating it between your finger and thumb. Figure
■ A hot glue gun or self-adhesive pads
9-5 shows the prepared board ready for the
■ A hacksaw components to be soldered onto it.

Step 2. Solder the Links
Assembly
Before starting on the real components, solder the
The project is all assembled on a single piece of
four wire links into place. When this is complete,
stripboard. The following steps will lead you
your board should look like Figure 9-6.
through the construction.

P A RT S BIN

Part Quantity Description Source
Transmitter 1 FM transmitter for MP3 player eBay
R1 1 10k 0.5-W metal film resistor Farnell: 9339787
R2–R4 3 47k 0.5-W metal film resistor Farnell: 9340637

R5 1 1k 0.5-W metal film resistor Farnell: 9339779
C1, C2 2 1μF 16V electrolytic capacitor Farnell: 1236655
C3 1 100nF Farnell: 1200414
IC1 1 7611 op amp Farnell: 1018166

IC socket 1 8 pin DIL IC socket Farnell: 1101345
Mic 1 Electret microphone insert Farnell: 1736563
Switch 1 SPST toggle switch Farnell: 1661841
Battery clip 1 PP3 battery clip Farnell: 1183124

Stripboard Ten strips each with 22 holes Farnell: 1201473
Battery 1 9V PP3 battery