technique_valley

The circuit uses a LTC1799 precision frequency generator from Linear Technology.  A 74HC14 hex Schmitt trigger from Texas Instruments is also used to perform several other functions.  One section is wired as a simple 7Hz square wave oscillator.

This circuit will turn on a beeper when the line voltage drops below 100 volt AC.

  EDN Design Idea   This Design Idea   offers a solution to the challenge of turning devices on or off in the past. In Figure 1, IC2 is a 555-type timer (preferably CMOS) connected as a monostable one-shot multivibrator. The pushbutton switch, S1, triggers IC2. You can replace S1 with a transistor or an optocoupler, for example. You can connect VOUT to a relay or a transistor, if needed. You might need to adjust the values of R4 and R5, depending on the output load and the characteristics of S1. The interval during which VOUT remains high is T=1.1RC2. … details here  

Circuit Ideas for Designers App Note - … more details here  

First Generation design that means it is not our latest design.  …  

Information and details regarding test setup and calibration, and how to use the evaluation software for data capture can be found in the CN-0269 Software User Guide In order for another controller to be used with the EVAL-CN0269-SDPZ evaluation board, software must be developed by a third party. . . more details here