Alarm transmitter (CB21874E)

This circuit was found in an Australian publication from 1991. The circuit emits a tone as well as the picked up sound when triggered.

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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...