Continuity tester (CB7386E)

This circuit was found in a Hands-On Electronics from the 90's. The FET can be any general purpose.

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Broadband amplifier (CB8402E)
This circuit that can amplify signals from 0 to 30 MHz was found in a 90s Popular Electronics....
Hearing and Motion Sensor Platform
August 2017 - STMicroelectronics' BlueCoin development environment is available at Mouser...
Current Limit (CIR035)
In this circuit the output current is limited by R3. For a 300 mA current, R3 must have 12 Ω. For...