Dolby noise reducer (CB21105E)

This circuit was found in a National Semiconductor Handbook from the 1990s. The integrated circuit used is from the time and the circuit is stereo.

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Micro Power LED (CB15111E)
This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit has an...
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Found in American documentation from the 90s, this circuit can measure frequencies on a linear...
FM Optical Transmitter (CB5269E)
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