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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Sequential Indicator (CB20342E)
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1.2 to 25 V x 3 A Variable Power Supply (CB1578E )
The source shown in the figure provides output voltages in the range of 1.2 to 25 V with currents up...