untitled

Building the box to house the circuit ..............................................

The box that houses the circuit needs holes so that you can place the LED,

the potentiometer dial you use to adjust resistance on the IC, and the on/off

switch as well as various wire connections.

Follow these steps to get the metal detector circuit enclosure ready:

1. Drill holes in the box where you will mount the LED, potentiometer,
   audio jacks, on/off switch, and clamp.

We put the on/off switch and the potentiometer on one side of the box,

the LED on one end, and the audio jacks on the bottom. However, the

placement is really up to you. Figure 12-10 shows where we placed these

components.

C1 between pins

of L1 TB

R1 from Pin 2

of IC1 to R2 TB

R4 from base pin of Q1

to Pin 6 of IC 1

C2 from Pin 5 of IC 1

to Pin 7 of IC 1

R5 from R4

to ground

R3 from LED TB

to +V

Figure 12-9:
Insert
resistors
and
capacitors
on the
breadboard.

Chapter 12: A Handy-Dandy Metal Detector 291