The circuit shown is from Motorola's 1990 Linear Databook. Components are not currently common. An equivalent can be used for the transistor.
This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be...
Found on 90's Popular Electronics, this circuit triggers when the microphone picks up a sound. The...
This traditional metronome circuit is powered by voltages from 9 to 12 V and output drives a...