Although a digital circuit for driving
a load such as a lamp or a d.c.
motor is fairly simple, it has a few
drawbacks. It does not make the layout
and constructicn of a printed-circuit
board simpler. Space needs to be
reserved for at least one resistor, one
transistor and one diode. If the circuit
consists of a number of such stages,
this can be a problem. It would be far
easier to use an IC that has all these
components on board. Several types of
this kind of IC are available, such as
Texas Instruments Type TPlC2404.
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