CIRCUIT HELP NEEDED

[RON]

I WOULD LIKE TO BUILD A CIRCUIT ALLOWING ME TO LIGHT 1-21 LIGHTS ONE AT A
TIME BUY PUSHING A MOMENTARY PUSH BUTTON.PUSH ONCE ONE LITE TWICE 2 STAY LIT
UP TO 21.I COULD BUILD FROM A SCHEMATIC.EMAIL [email protected] THANKS RON

 

[Russell Powell]

For this, I'd suggest using a shift register (probably need three 8-bit
registers
(SN 74LS164 or similar) for upto 24 lights). Use a de-bounced momentary
push button as the clocking source. Each push would represent one clock
cycle. Shift in all 1's and use the parallel outputs to control mosfets
which
are controlling the lamps. With this scheme, you could also have an
additional
reset pushbutton to turn off all the lights at once or feedback the 22nd
parallel
output to use as the reset.
Operation would be each push of the button would light a lamp in series -
while
previous lit lamps remain on. After 21 pushbutton pulses - all lamps are
lit.
The 22nd pushbutton will reset (turn off) all the lamps.