The M-980-02 is an integrated circuit tone detector for general purpose use in automatic following of switched telephone calls. The circuit uses low-power CMOS techniques to provide for this function.

In a laser barrier system, the receiver circuit generally uses signal amplitude for detection purposes. This configuration yields a complex circuit with a number of components, including an amplifier, ...

Scienceprog has posted how-to build a DTMF tone detector. DTMF are the standard sounds used in tone dialing. Plugging this circuit into your phone line you can decode the all the tones on the line ...

A NOAA weather receiver housed in a 1RU chassis, this receiver offers a front panel that has a built-in monitor speaker with volume control. There are two 10-segment LED indicators, one for the ...