Thread: Electronic Circuit Help - Flip-Flop

You coudl use a 74LS193 combined with a 74LS138. Wire the "3" decoded output from the 74LS138 back to the master reset of the 74LS193. The system will then count 0, 1, 2, 0, 1, 2 over and over. Use 0, 1 outputs to drive your lamps.
When 2 is active, that will be the off stage. You can add lamps or change the sequence by moving the reset tap on the 74LS138.

You may need the non inverting output version of th 74LS138 (can't remember the exact part number atm).


Rob

or you could wire three flip flops in series, and use the push buton for the clock

why cant you use a 3 position "on off on" switch like this?
http://www.switchchannel.com/product.../orl/index.htm
ground the 2 lamps. The center pin goes to positive, lamp 1 goes to top pin (depends on how you look at the switch), lamp 2 goes to bottom pin. The on off on switch will do exactly what you want.

Originally posted by mikeinsanmarcos
or you could just get a single pole tripple throw switch?

Ah, I misunderstood, I thought he wanted it to do all three states in order, with no possibility of user error (and potentially automated). A three position switch (center-off) would give you the sequence lamp1on, off lamp2on, off, lamp1on, off, etc...


Rob