This circuit was found in a 1967 Electronics World. The circuit uses components of the time that are difficult to obtain, such as the transformer.
Using the LM383 this circuit was found in a Popular Electronics from the 90s. The source must be...
This circuit that drives the load when the logic output is at the low level, was obtained in a...
This pulse frequency modulation circuit or PFM from audio signals can also be used as a sensor input...