
Glossary
217
squarewave a signal which oscillates between two fixed
voltages.
stabilise
to produce a fixed d.c. voltage from a
smoothed one.
three-rail power supply a power supply which has a
positive supply rail, a negative supply rail, and a OV
supply rail.
time constant (t) the product of the capacitance and
the resistance in a capacitor/ resistor charging or dis-
charging circuit.
track the fixed resistive
part
of a potentiometer.
transfer characteristic a graph of collector current
against base current (for a transistor in common emit-
ter mode).
transistor a three layer semiconductor device, which
may consist of a thin P-type layer sandwiche ...