Relay array controlled with row and column switch - all out but one - negative rail control

168

01:24:42

An array of relays using the contact to the negative rail to control the rows and/or columns to turn off.  With this setup it is not possible to turn off less than one entire row/column but it is possible to keep one only LED on. Each LED's state is the opposite of the relays, equivalent to a "NOT" gate. The dual diodes at be bottom left of each relay is playing the role of an "OR" gate. Therefore, each assembly of LED+relay+diodes is a "NOR" gate. LED is on in each position for which neither the row nor the column is switched.

published 2 years ago

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.