PTT or Push to Talk is the control that switches the speak-hear function on a transceiver. This circuit was found in the magazine of radio amateurs 73, in an edition of the 90s.
This circuit can be used to recognize a tone by its frequency. When this tone is present in a...
We have many versions of biofeedback with the 555 IC on this site. This is another one. We found it...
In fact, it is a night light system that automatically turns on the outside lights when it gets...