Found in a 90s Popular Electronics, this circuit triggers a load from the audio signal applied to its input. The controlled load depends on the MOSFET.
This circuit was found in an old American documentation. Its purpose is a proportional scanning signal...
This circuit emits a loud sound in a headset when the driver who wears it nods while being in a...
This amplifier stage was found in a 1956 Sylvania manual and has an unusual configuration with a...