DC to DC converter (CB9673E)

This converter uses an SG1524 integrated circuit, which is uncommon nowadays. The circuit is from an 80's documentation.

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Digital Band Pass 10 to 20 kHz Filter (CB13536E)
This circuit was obtained in the 1977 RCA CMOS manual. The circuit has the frequencies determined by the...
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Difference Amplifier (CB6429E)
Found in a Popular Electronics of the 90s this configuration can be seen elsewhere on our site....