Schematics > Motor, light and power control > 60 Light Sequencer using a Matrix
60 Light Sequencer using a MatrixThe circuit below illustrates using a 10x10 matrix to sequence up to 100 LEDs
with just three ICs and 20 transistors. The two 4017 decade counters control the
10 rows and 10 columns so that one LED is selected depending on the output of
the decade counters.
The LED circuit is drawn showing 25 LEDs and 10 transistors but can be
expanded up to a 100 by using sucessive stages of the 4017 counters.
For example, to expand the circuit to 60 LEDs for displaying minutes or
seconds of a clock, the rows counter could be reset from pin 12 (carry out)
rather than pin 1 as shown, and the columns counter will be reset from pin 5
rather than pin 1 as shown. And then add transistors to pins 1,5,6,9,and 11 of
the rows counter and pin 1 of the columns counter. Take a look at the "10 Stage
LED Sequencer" for a listing of all the connections of the 4017 decade counter.
60 Light Sequencer using a Matrix circuit
Title: 60 Light Sequencer using a Matrix
Source: unknown
Published on: 2007-07-21
Reads: 1698
Print version:  Other schematics from Motor, light and power control
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