Circuit for sleep mode (CB8430E)

This circuit was found in a 90s Electronic Design. It uses integrated circuits that are not common today.

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Darlington PNP Power Switch (CB11593E)
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Biquad Filter LM148 (CB4012E)
The circuit is from the 1990 Motorola Linear Databook. The circuit can be implemented with other...
Using a magic eye tube transistor circuit (CB23709E)
This interesting circuit with an indicator tube powered by a transistor inverter was found in...