11
9
10
11
12
3. Trimmer Potentiometer: Place VR1 in it’s location with the adjustment screw located toward the
PZ holes. Solder and clip the leads (13).
13
4. Transistors: This circuit contains three field effect transistors (FETs). FETs are quite sensitive to
static electricity and could easily be damaged if they are exposed to moderately high voltages.
The voltage rating of these FETs is only 35V, meaning that if over 35 volts is applied across
two leads on one of these components it will most likely be damaged to the point of not being
usable. Unfortunately, humans are not sensitive to static electricity at such low levels; in fact, most
people can’t even feel a static discharge less than 1000 volts! So it is very easy to damage these
components without even knowing it. Consequently, it is important to handle these components
as little as possible. When you do have to handle them make sure you are grounded, preferably
by touching something grounded to the mains like the metal chassis of a plugged in amplifier, or
a refrigerator. At the very least you should touch a large conductive object like a metal desk or a
filing cabinet. With this information in mind please proceed carefully.
