Hi,
I'm looking to build a led scanner/sequencer without using microcontrollers (yet),
the basic effect I would like is a row of 18 leds which switch on 1 and 18, 2 and 17, 3 and 16, finishing
with 9 and10. (scanning from ends to middle)
The circuit below, to me, seems to just run 1 to 18 in sequence,
So firstly, could it be altered to run how I want it, without too much trouble, or do I need a completly different circuit.
Secondly, would the 4017 be able to run a second row of leds, so 2 leds per outlet, a total of 36, the leds will be 3mm red,
20-30ma and 2.1 -2.4 fv, my power supply will be a 12v/12ah/5hr SLA battery (iirc, its 13.4 or 13.6v fully charged).
Thirdly, can a varible resistor be used to control the speed?
And lastly, once the sequence finishes at 9 and 10, could it be reversed, before starting the same sequence again?
I'm looking to build a led scanner/sequencer without using microcontrollers (yet),
the basic effect I would like is a row of 18 leds which switch on 1 and 18, 2 and 17, 3 and 16, finishing
with 9 and10. (scanning from ends to middle)
The circuit below, to me, seems to just run 1 to 18 in sequence,
So firstly, could it be altered to run how I want it, without too much trouble, or do I need a completly different circuit.
Secondly, would the 4017 be able to run a second row of leds, so 2 leds per outlet, a total of 36, the leds will be 3mm red,
20-30ma and 2.1 -2.4 fv, my power supply will be a 12v/12ah/5hr SLA battery (iirc, its 13.4 or 13.6v fully charged).
Thirdly, can a varible resistor be used to control the speed?
And lastly, once the sequence finishes at 9 and 10, could it be reversed, before starting the same sequence again?