The display is intended as
a turning indicatoror a VU
meter on a stereo FM radio. The
first function is selected by
pressing S1 (which may, of
course, be replaced by a normal
on/ off switch). Depending
on the mode selected, the circuit acts as a single linear
scale (for the tuning voltage),
or a stereo VU meter with a
quasi-Iogarithmic scale.
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