Input selection in the battery operated
preamplifier published in the
January 1997 issue of this magazine
is by rotary switch. This does not
give the best possible performance as
far as cross talk and channel separation
are concerned. This article proposes
a better means, which also
enables the number of input to be
extended to 12. In this design, each
input source is linked to the circuit
via a bistable relay (described elsewhere
in this issue).
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