Multiplexed BCD Driver (CB20908E)

This circuit was found in an Electronics Now from the 80's. The circuit is designed for 3-digit displays. The circuit is TTL.

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7MHz Transmitter (CB11873E)
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Phototransistor 2N5777 (CB16044E)
Foto-Darlington for applications such as light sensor. In normal applications only the collector and...
Two-tone generator (CB8446E)
This circuit was found in a 90s Popular Electronics. It generates tones given by the oscillators and...