Following the detailed description of the preamplifier
in last month's installment, this second
and final part of the article deals with the power
supply and the construction of the complete
unit. More so than usual, the power supply
forms an important part of the overall design. It
consists of 12 NiMH batteries, size AA
(RG/HP7) with a nominal capacity of 1.2 Ah,
and a moderately fast charger that takes about
three hours to fully charge a set of flat batteries
(note that it is not a good idea to discharge
these batteries completely - the nominal voltage
level is maintained at 1.2 V during 80% of
the discharge cycle).
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