Light Chaser I
#LED
#4017
#light chaser
#sequencer
#optoisolator
#triac
#decade counter
#light control
#sequential lighting
Description: Up to 100 lights, LEDs, or optocoupler triac circuits can be sequentially activated by this circuit. One (U1) 4017 decodes and sequences 10 LEDs, whose common anode is returned through a second (U2) CD4017, which counts at one-tenth of the rate. The flash rate is controlled by U3, a clock circuit, with a 555 timer.
This circuit is designed to sequentially activate a large number of lights, such as LEDs or optocoupler triac circuits, utilizing two CD4017 decade counters (U1 and U2) and a 555 timer. The first CD4017 (U1) is configured to decode and sequence up to 10 output signals, each corresponding to an individual LED. The common anode configuration allows for a simplified wiring scheme, where the anodes of the LEDs are connected together, and the cathodes are driven by the outputs of the CD4017.
The second CD4017 (U2) operates at a reduced counting rate, specifically one-tenth of U1's frequency. This is achieved by connecting the output of U1 to the clock input of U2, effectively dividing the frequency of the LED sequencing. As a result, while U1 activates each LED in quick succession, U2 provides a slower sequence that can be used for additional visual effects or to control a larger number of LEDs in a cascading manner.
The timing of the entire circuit is governed by a 555 timer (U3), which is configured in astable mode to generate a continuous square wave signal. The frequency of this signal sets the flash rate of the LEDs. By adjusting the resistors and capacitors connected to the 555 timer, the timing characteristics can be modified to achieve the desired flash rate. This flexibility allows for a range of visual effects, from rapid blinking to slower, more dramatic transitions.
In summary, this circuit provides a versatile solution for sequentially activating up to 100 lights, utilizing a combination of CD4017 counters and a 555 timer to control the timing and sequencing of the outputs. The design is suitable for various applications, including decorative lighting, visual displays, and signaling systems. Up to 100 lights, LEDs, or optocoupler triac circuits can be sequentially activated by this circuit. One (Ul) 4017 decode co unter sequences 10 LEDs whose common anode is returned through a second (U2) CD4017, which counts at one-tenth of the rate. The flash rate is controlled by U3, a clock circuit, with a 555 timer.
This circuit is designed to sequentially activate a large number of lights, such as LEDs or optocoupler triac circuits, utilizing two CD4017 decade counters (U1 and U2) and a 555 timer. The first CD4017 (U1) is configured to decode and sequence up to 10 output signals, each corresponding to an individual LED. The common anode configuration allows for a simplified wiring scheme, where the anodes of the LEDs are connected together, and the cathodes are driven by the outputs of the CD4017.
The second CD4017 (U2) operates at a reduced counting rate, specifically one-tenth of U1's frequency. This is achieved by connecting the output of U1 to the clock input of U2, effectively dividing the frequency of the LED sequencing. As a result, while U1 activates each LED in quick succession, U2 provides a slower sequence that can be used for additional visual effects or to control a larger number of LEDs in a cascading manner.
The timing of the entire circuit is governed by a 555 timer (U3), which is configured in astable mode to generate a continuous square wave signal. The frequency of this signal sets the flash rate of the LEDs. By adjusting the resistors and capacitors connected to the 555 timer, the timing characteristics can be modified to achieve the desired flash rate. This flexibility allows for a range of visual effects, from rapid blinking to slower, more dramatic transitions.
In summary, this circuit provides a versatile solution for sequentially activating up to 100 lights, utilizing a combination of CD4017 counters and a 555 timer to control the timing and sequencing of the outputs. The design is suitable for various applications, including decorative lighting, visual displays, and signaling systems. Up to 100 lights, LEDs, or optocoupler triac circuits can be sequentially activated by this circuit. One (Ul) 4017 decode co unter sequences 10 LEDs whose common anode is returned through a second (U2) CD4017, which counts at one-tenth of the rate. The flash rate is controlled by U3, a clock circuit, with a 555 timer.
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