This circuit was found in a Texas Instruments documentation from the 1980s. The circuit monitors engine temperature by warning of engine warm-up and warning when the fan is on.
This stage circuitry for amplifying microphone signals makes use of germanium transistors as indicated...
This circuit is triggered by the touch of the fingers on a sensor. The sensor is formed by two...
Found in a Popular Electronics from the 90s, this circuit transforms an ordinary oscilloscope into a...