This tester is designed to locate stray electromagnetic (EM) fields. [more]
Using a single cable such as speaker wire or doorbell cable, this circuit can be remotely positioned, for example, at the bottom of a garden or garage, and used to detect all sound in that... [more]
This simple circuit uses an incandescent lamp to detect airflow. With the filament exposed to air, a constant current source is used to slightly heat the filament. [more]
This circuit was designed to remotely monitor when a couple of electric heaters have been left on. [more]
The circuit is small regulatorof temperature, us warns for the increase of temperature. The control of temperature becomes from the thermistor TH1, that is negative factor. [more]
This circuit give low level output, when exist enough lighting, that is a detector of light. It can give, say ,command turn on somebodies lights, when fall the dark. His exit is compatible with TTL... [more]
Here we have three choices, with which we can make electronic switches that use our touch or pressing (push button). We thus exploit the very big resistance of entry, that present the gates CMOS. [more]
Is acquaintance that circuits CMOS present very big resistance of entry, thus if through this resistance it passes a small current, will be created a enough important fall of voltage, which we can exploit suitably... [more]
Light sensitive and differential temperature switch [more]