Active tone control (CB9373E)

This circuit is from a Radio Electronics from the 90's. The integrated circuit is from the time and the boost gain is 20 dB.

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Class A power amplifier (CB22236E)
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LED Driver MC34071 (CB15285E)
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Device On indicator (CB7014E)
Found in a European magazine from the 90s, this circuit emits beeps that are several seconds apart to...