Bipolar Current Level Detector (CB6629E)

The circuit shown was found in an American documentation from 1964. The circuit uses transistors of the time and the indicators are small lamps.

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Transistor static switch (CB9287E)
This static switch circuit or solid-state contactor was found in a Motorola documentation from...
DC Amplifier with Drift Compensation (CB14068E)
of the National Semiconductor of 1994. The same technique can be used with other operators and the...
Color Code Identifier (CB16353E)
Have you not yet memorized the color code used to identify resistors and capacitors? Do you have...