Multiple-input-detector


Posted on May 2, 2012

This circuit determines whether more than one input in a group of digital inputs is active. It provides a digital measure of the number of active inputs, and it allows you to establish a threshold for majority-decision applications. That is, whether the number of active inputs is more than, less than, or equal to a value between 1 and 15. You can monitor more inputs by cascading the adders. Each binary adder, IC1 and IC2, forms two full adders (FAs). Each FA monitors three input lines and generates a 2-bit output representing the number of inputs active.


Multiple-input-detector
Click here to download the full size of the above Circuit.

IC3 and IC4, by summing the outputs of two FAs plus an input line, individually measure how many in a group of seven inputs are active. Similarly, by monitoring the 3-bit outputs of IC3 and IC4 plus one input, IC5 measures how many in the group of 15 are active. The OR gate, IC6, simply indicates whether more than one input is active.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

RF data link and remote control
Single-op-amp-clock
Explosive Gas Detector Circuit
Invert a 555 Astable Output Signal
Changing Fan Speeds
gym agility simple strategy
loop antennas
Homebrewing
Transcranial magnetic stimulation
Using ADC 0808-ADC 0809 circuit chip consisting
Echo Depth Sounding Sonar for Boats



Top