Visual metronome (CB21062E)

Based on the well-known LM3909, this LED pulser circuit was found in American documentation from the 90's. The power supply is only 1.5 V.

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High Side Drivers PWM controller (CB15567E)
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This blocking oscillator that appears elsewhere on this site from other sources, was found in a...
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This is a diagram of a 1958 commercial receiver. The circuit was found in documentation at the...