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Dual-purpose LED display

Dual-purpose LED display
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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