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Starting electronics
Figure 7.7
The circuit symbol for a transformer
Figure 7.8
A simple output rectifier circuit using a diode
but nevertheless is technically a d.c. voltage. You’ll see that
of each wave or cycle of a.c. voltage from the transformer,
only the positive half gets through the diode to the resistor.
For this reason, the type of rectification shown by the circuit
Figure 7.8 is known as half-wave rectification.
It would obviously give a much steadier d.c. voltage if both
half waves of the a.c. voltage could pass to the load. We can
do this in two ways. First by using a modified transformer,
with a centre-tap to the output or secondary coil and two
diodes as in Figure 7.10. The centre-tap of the transformer
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