Posted on Aug 15, 2012

In this application, the ICM7249 is configured as an hours-in-use meter and shows how many whole hours of line voltage have been applied. The 20-MD resistor and high-pass filtering allow ac line activation of the SIS input. This configuration, which is powered by a 3-V lithium cell, will operate continuously for 21/z years.

Click here to download the full size of the above Circuit.

Without the display, which only needs to be connected when a reading is required, the span of operation is extended to 10 years.

Leave Comment

characters left:

New Circuits



Popular Circuits

Bipolar Stepper Motor Driver Circuit
The intellectual digital voltmeter based on MSP430 one-chip computer is designed
15w rf amplifier circuit
Symmetric Output for USB Audio DAC
use CD-ROM drive as stand-alone audio CD player
Captret and Tesla switch
Temperature Sensor
Dedicated headphone amplifier integrated amplifier LM4880-03