Perusing the Parts List
Even though this project doesn’t require many
parts, you still have to go out and buy or assemble them.
Several of the parts are shown in Figure 12-3.
Here’s what you need:
Two 1 kohm resistors (R1, R4)
10 kohm potentiometer (R2)
330 ohm
resistor (R3)
120 ohm resistor (R5)
Two 0.0047 microfarad ceramic capacitors (C1, C3)
One 2N3904 transistor (Q1)
One T-1 3⁄4
LED (LED1)
LED panel-mount socket, T-1
3⁄4
TDA0161 proximity detector (IC1)
Battery pack for 4 AA batteries
680 picofarad bobbin-type inductor (L1)
We used C&D Technologies part #1468420C that we
picked up at Mouser (
www.mouser.com).
SPST (single-pole, single-throw) toggle switch, used as the
on/off switch
400-pin breadboard
Four 2-pin terminal blocks
Knob (for the potentiometer)
Two phono jacks
Two right-angle phono plugs
We used right-angle plugs to avoid having a loop
of wire coming out of the box. You can also use banana plugs and
jacks.
Enclosure
We used a plastic box, RadioShack part
#270-1806.
An assortment of different lengths of prestripped, short 22 AWG
wire
Two PVC 45° joints with 1" slip fitting on both ends (one male
and one female)
PVC 1" end cap with 1" female slip fitting
1" diameter PVC pipe (referred to as
schedule 40 pipe),
1' in length
1" clamp to attach the enclosure to the pipe
Two 1⁄2"
8-32 panhead screws
Two 8-32 nuts
