Current monitor with digital output (CB7275E)

Found in Linear Technology documentation, this circuit drains only 70 uA of the monitored circuit. The components used are from that time.

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Code Switch (CB12393E)
This code switch was found in a 1990 Electronics Handbook. It can be mounted with BC558...
Micro Integrated Amplifier (CB5039E)
This amplifier can be powered with voltages between 2 and 5 V with power up to 100 mW. The minimum...
Transistorized Siren (CB9081E)
Found in English documentation from the 1980s, this 3 transistors siren directly drives a small...