This circuit is suggested by Texas Instruments in old documentation. The components depend on the desired characteristics for the circuit. The power supply must be symmetrical.
With this circuit, a relay can be activated from an alternating signal with frequency up to a few...
With this circuit the visually impaired can easily locate important places inside the house, such...
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...