untitled

3. Insert the wires from the headphone jack, potentiometer, phono jacks,
   battery pack, and the on/off switch to the terminal blocks on the
   breadboard, as shown in Figure 6-18.


4. As you insert the wires, cut each of them to the length you need to
   reach the assigned terminal block and strip the insulation from the
   end of each wire.
   Keep the wires from the headphone jack as far as possible away from
   the wires from the potentiometer and the wires from the microphone
   cartridge. Remember how a microphone put too close to a speaker can
   produce an awful screech? The same screech can assault your ears if
   these wires get too close together.

Black wire

from on/off

switch

Red wire

from

battery pack

Black wire

from headphone

jack

Red wire

from headphone

jack

Black wire

from

phono

jack

Red wire

from

phono

Wire from left lug of potentiometer jack

Wire from right lug of potentiometer

Wire from center lug of potentiometer

Figure 6-18:
Connect the
headphone
jack, poten-
tiometer,
on/off
switch, and
battery pack
to the
breadboard.

Chapter 6: Focusing Sound with a Parabolic Microphone 135