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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Stereo Balance Indicator (CB6001E)
This passive circuit was found in a 1980s documentation. The circuit serves to indicate the...
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We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the...
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This circuit was obtained in a 1969 Mullard manual. The transistors are from that time. The input...